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Layered Co(OH)2 has been regarded as a potential candidate for pseudocapacitor electrode material, but it is limited by its poor conductivity and low surface area. Herein, carbonated multi-walled carbon nanotubes (MWCNTs-COOH) were used to improve the conductivity of α-Co(OH)2 nanocomposites. α-Co(OH)2 nanoflowers were successfully grown and tangled with MWCNTs-COOH to form a randomly oriented network structure mediated by ammonia using water-methanol as co-solvent at room temperature. The capacitance performances of the obtained α-Co(OH)2@MWCNT-COOH composites were investigated to find that MWCNT-COOH improved the specific capacitance efficiently. Especially, in the presence of 20% in mole of MWCNT-COOH, the composite gave rise to the high specific capacitance of 1027 F/g at the current density of 2 A/g with good cycle stability, whose specific capacitance remained 78% of its original even after 5000 cycles at 30 A/g current. The large surface area and strengthening the conductivity of the composites lead to the improvement of efficiency in charge/discharge process.

Currently there is tremendous interest in the discovery of low cost and efficient electrocatalysts for the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER). In this work, iron-doped nickel boride (FexNi1-xB) and nickel boride (NiB) were successfully grown on 3D self-supporting graphene (SSG) electrodes via a one-step reduction approach. The Fe0.2Ni0.8B/SSG electrode required a very low overpotential of only 263 mV for OER (the best OER activity achieved to date for a metal boride). NiB/SSG showed modest OER performance but excellent HER activity. A water electrolyzer comprising Fe0.2Ni0.8B/SSG and NiB/SSG delivered a current density of 10 mA cm−2 at a voltage of only 1.62 V. Further, the Fe0.2Ni0.8B/SSG and NiB/SSG catalysts showed excellent stability with no deactivation observed over 14 h of testing. Results demonstrate that nickel boride-based electrocatalysts are promising lost cost alternatives to precious metal-based electrocatalysts for OER, HER and overall water splitting.

The transition metal dichalcogenide MoS2 shows good catalytic properties for the hydrogen evolution reaction (HER). However, the HER activity of 2D MoS2 is limited by its poor electrical conductivity. Bi2Se3 nanosheets are topological insulators possessing metallic surface states, thereby displaying unconventional electron dynamics and excellent conductivity. Therefore, combining Bi2Se3 nanosheets and with MoS2 nanosheets represents a rational approach for improving the HER activity of MoS2. In this work, Bi2Se3 nanoflowers were first synthesized via a hot injection method, followed by the slow growth of MoS2 nanosheets on their surface to form heterostructured MoS2@Bi2Se3 nanoflowers. Compared to pristine Bi2Se3 and MoS2, the MoS2@Bi2Se3 nanoflowers exhibited outstanding HER activity in acidic media with an onset overpotential of 134 mV, an overpotential of 208 mV at 10 mA/cm2, a Tafel slope of 57 mV/dec and remarkable stability. The enhanced HER catalytic activity offered by the MoS2@Bi2Se3 nanoflowers is attributed excellent electron transfer from Bi2Se3 to MoS2, as well as the abundance of edge-rich MoS2 nanosheets vertically aligned on the Bi2Se3 support that act as H2 evolution sites.

Hydrogen production from water splitting through electrocatalytic or photoelectrochemical route shows great potential for renewable energy conversion. Herein, the plasmon-enhanced photoelectrical nanocatalysts (NCs) have been successfully developed by Au nanoparticle-decorated Bi2Se3 nanoflowers (Au@Bi2Se3 NFs) as catalysts for hydrogen evolution reaction (HER), leading to a more than 3-fold increase of current under excitation of Au localized surface plasmon resonance (LSPR) and affording a markedly decreased overpotential of 375 mV at a current density of 10 mA cm−2. The HER enhancement can be largely attributed to effective electron-charge separation and the increase of carrier density in Bi2Se3 induced by the injection of hot electrons of Au nanoparticles. Meanwhile, Bi2Se3 nanoflowers (NFs), a kind of topological insulators, possess gapless edges on boundary and show metallic character on surface, providing a path for the flow of electrons in the electrocatalytic system. This study opens up a new avenue towards the design of higher energy conversion catalytic water splitting systems with the assistance of light energy, which could increase of HER catalysis efficiency by plasmonic excitation.

In recent years, great efforts are paying to design and understand the origins of elastic flexibility of molecular crystals. In this work, we investigate the elastic flexibility of two ferroelectric supramolecular co-crystals, phenazine-chloranilic acid (Phz-H2ca) and phenazine-bromanilic acid (Phz-H2ba) for the first time. Both of them show good elastic flexibility while the flexibility of the Phz-H2ca co-crystal is better. The measurements of mechanical properties show that the Phz-H2ca co-crystal has larger elastic modulus and smaller hardness value than the Phz-H2ba co-crystal. The bent co-crystal still keeps the ferroelectric properties. The Raman spectra reveal that the weak hydrogen-bond, halogen-bond and π···π stacking interactions contribute to the observed elastic flexibility of the co-crystals.

Stretchable and self-healing polymer gels with luminescent property are very promising materials for next generation soft optical devices. This work presents the preparation of self-healing and luminescent polymer gels by simply blending organometal halide perovskite nanocrystals (OHP NCs) with poly(dimethylsiloxane)-urea copolymer (PDMS-urea). On the one hand, the obtained luminescent gels are not only flexible, stretchable and relatively transparent, they also exhibit excellent self-healing capability due to the reversible hydrogen bonding network in the PDMS-urea copolymer. On the other hand, the embedding of OHP NCs (MAPbBr3 and MAPbI3 NCs) inside the hydrophobic PDMS-urea gel greatly improved the photoluminescence stability of OHP NCs against water. Their applications as phosphors for LEDs have been demonstrated. Both the MAPbBr3/PDMS-urea gel and MAPbI3/PDMS-urea gel can fully convert the blue emission of GaN chip to green and red emissions, respectively. These gels can be used as photoluminescent materials in flexible optical devices with good self-healing capability.

Organometallic halide perovskites have been demonstrated to be very promising for nonlinear optics and practical frequency upconversion devices in integrated photonics. In this work, high quality o...

The [Zr(OH)5]− imidazolium complex was used to synthesize a zirconia precursor with plate-like nanostructue hydrolyzed under strong acid conditions, which was characterized by means of powder X-ray diffraction, thermogravimetric-differential scanning calorimetry, Fourier transform infrared spectroscopy, Raman spectroscopy, elemental analysis, inductively coupled plasma and electronic differential system. The zirconia precursor can be transformed to monoclinic ZrO2 by annealing at a temperature above 400 °C. With the increasing of the curing temperature, it tended to give rise to porous ZrO2 nanostructures.

Metallic glasses with long-range disordered atomic structure have recently been attracted a great deal of research attention in catalytic field. Compared to crystalline materials, the metallic glasses present many advanced catalytic properties, yet the catalytic mechanism is not sufficiently understood. In this work, an Fe78Si9B13 glassy ribbon manufactured by melt-spinning method was applied for the first time to compare its activation behavior on three peroxides, including hydrogen peroxide (H2O2), persulfate (PS) and peroxymonosulfate (PMS). It was shown that Fe78Si9B13 metallic glass had exceptionally high capability for activating these three common peroxides to produce reactive radicals ( OH and/or SO4•−). The dominant species of H2O2 in this work was demonstrated as hydroxyl radical ( OH) while the PS and PMS activation mainly generated sulfate radical (SO4•−). The order of predominant radical generation rate by Fe78Si9B13 activation under UV−vis irradiation was PS > H2O2 > PMS. The relative contribution of sulfate radical (SO4•−) in PS activation was 78% compared to 61% in PMS. All the peroxides activated by Fe78Si9B13 metallic glass presented a radical generation rate at least ∼2 times higher than other iron-containing materials. Crystal violet (CV) dye was used to investigate the catalytic performance of Fe78Si9B13 metallic glass for peroxides, which showed an ultrafast dye degradation rate with completely color removal within 15 min. The radical evolution mechanisms for H2O2, PS and PMS activation were also investigated. The change in surface morphology of ribbon after 5th run reused indicated that the inclusions of Si leading to formation of SiO2 layer played an important role in the surface stability of ribbons.

Poly(vinylidene fluoride/trifluoroethylene) (PVDF-TrFE) as a representative organic piezoelectric material have recently attracted wide attention. However, low dielectric permittivity limits its applications. We successfully prepared transparent PVDF-TrFE/graphene oxide (GO) ultrathin films. The addition of GO greatly improved the dielectric properties of PVDF-TrFE. The dielectric constant of the composite film is almost three times of that of the PVDF-TrFE film with the addition of 0.1 wt. % of GO nanosheets. Furthermore, the composite film also exhibits enhanced energy harvesting performance. The electric generator based on the PVDF-TrFE/ GO ultrathin film shows an output voltages of 49 mV under a pressure of 3.06 KPa. The advantages of transparence, flexibility and better energy harvesting performance make PVDF-TrFE/GO composite films much more attractive in promising applications of nano/micro electronic devices.

Bi 2 O 3 nanoparticles are prepared by using a facile solution-based thermal decomposition method assisted by oleylamine. These Bi 2 O 3 nanoparticles self assemble into nanobelts. The reaction time and temperature affect self-assembly behaviour of the Bi 2 O 3 nanoparticles. Increasing the reaction time or temperature results in the larger size of nanoparticles, which leads to failure of formation of nanobelts. It is illustrated that oleylamine and the size of nanoparticles play key roles in the self-assembly of nanoparticles. Based on the experimental results, a formation mechanism of the self-assembled nanobelts was proposed and this method may be extended to fabrication of other metal oxide nanobelts.

One dimensional coordination polymer Gd[(SO 4 )(NO 3 )(C 2 H 6 SO) 2 ] ( 1 ) is prepared through the mediation of Bronsted acid ionic liquid, which crystallized in the monoclinic space of C2/c. In this polymer, adjacent Gd atoms are linked by two SO 4 2- ions to generate a 1-D chain, and all oxygen atoms in SO 4 2- groups are connected to three nearest Gd atoms in µ 3 :η 1 :η 1 :η 2 fashion. Gd, S and N from SO 4 2- and NO 3 - are precisely coplanar. The planar is coordinated by a pair of DMSO molecules, which is parallel and linked by hydrogen bonding to form a three-dimensional supramolecular network. Magnetic susceptibility measurement of 1 reveals weak antiferromagnetic interactions between the Gd (III) ions. It exhibits relatively large magneto-caloric effect with –ΔS m =28.8 J Kg −1 K −1 for ΔH=7 T.

An efficient nitrate/HCl chemical exfoliation system for rapid production of MoS 2 and WS 2 nanosheets were presented here. After exfoliation in the NaNO 3 /HCl solution with the assistant of ultrasonication, MoS 2 and WS 2 nanosheets were produced with yields of 58% and 52%, respectively. The morphologies and crystallinity of MoS 2 and WS 2 nanosheets were characterized by transmission electron microscopy, atomic force microscopy and X-ray diffraction spectroscopy. This efficient exfoliation method is based on the synergy effects of surface etching, insertion of ions and eruption of gas bubbles. The MoS 2 and WS 2 nanosheets exhibited improved catalytic activity toward the oxygen-reduction reaction.

In this study, MoS2 nanosheets were first prepared by exfoliating its bulk material in HCl/LiNO3 solution with a yield of 45%, and then a facile strategy was developed to synthesize polyaniline/MoS2 (PANI/MoS2) nanocomposite via in situ polymerization. Structural and morphological characterizations of MoS2 nanosheets and the nanocomposite were investigated by scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray powder diffraction. The results of SEM illustrated that orderly sawtooth polyaniline (PANI) nanoarrays were formed on the surface of MoS2 nanosheets. The nanocomposite displayed good electrochemical performance as a supercapacitor electrode material. The specific capacitance reached 560 F/g at a current density of 1.0 A g−1 in 1.0 M H2SO4 solution. Such good performance is because that the MoS2 nanosheets provided a highly electrolytic accessible surface area for redox-active PANI and a direct path for electrons.

Surface anisotropy of spinel LiMn2O4 crystal is of significance for strengthening the lithium storage. In this work, we investigate the evolutions of surface orientations and oxygen vacancies in the LiMn2O4 cathode materials by the spherical aberration-corrected scanning transmission electron microscopy (Cs-STEM) technique. Firstly, the {111} lattice planes appear in the formed LiMn2O4 octahedra, and then the {110} and {001} crystal planes are observed in the subsequent truncated octahedral at a higher temperature or a longer annealing time. The LiMn2O4 crystals with dominated {111} and {110} planes and an appropriate amount of oxygen vacancies exhibits a superior cycling performance and rate performance, suggesting a synergistic effect of surface orientation and concentration of oxygen vacancies achieves an enhanced electrochemical performance. The introduction of oxygen vacancies can accelerate the diffusion of lithium-ions along {110} plane and strengthen the rate performance of LiMn2O4, as elucidated by the combination of Cs-STEM observation, X-ray photoelectronic spectra analysis and property measurements.

Luminescent (trimethylbromomethyl) ammonium lead tribromide ((TMBM)PbBr3) nanocrystals are synthesized by a green single-step mechano-grinding method in large scale. The photoluminescence quantum yield (PL QY) of the obtained (TMBM)PbBr3 nanocrystals is 2.61 %. The luminescence of the nanocrystals can be significantly enhanced by introducing water or methanol during the grinding process. The maximum PL QYs of 7.65 % and 4.69 % are obtained for the nanocrystals prepared by the addition of water and methanol, respectively. The emission light of (TMBM)PbBr3 nanocrystals can be tuned by the doping of chloride ion.

Combination of excellent optical properties and ferroelectricity of hybrid materials leads to high-performance optoelectronic devices. Here we present a new organic–inorganic hybrid compound (diisopropylammonium)2MnBr4 (DIPA2MnBr4) which shows high temperature ferroelectricity accompanied by highly efficient green-light emission. DIPA2MnBr4 also exhibits sensitive and selective optical response to alcohol vapors.

Organometal halide perovskites, as promising semiconductor materials for achieving future low-cost optoelectronic devices, suffer from inherent instability and undergo extremely fast degradation under exposure to moisture, UV light, or high temperature. Herein, we present a facile and low cost approach for the preparation of perovskite-based composite films via blending CH3NH3PbBr3 nanocrystals (MAPbBr3 NCs) with two kinds of commercially available silicone resins. The highest photoluminescence quantum yield of the prepared composite films is up to 62%. The composite films of MAPbBr3 NCs with phenyl methyl silicon resin (PMSR) show unprecedented stability against water, heat and UV exposure. Their applications as paints or as phosphors for the fabrication of green and white light LEDs are demonstrated.

Phosphorous doped carbon dots (P-CDs) are prepared by a one-step hydrothermal method. The phenomenon of aggregation induced red shift emission (AIRSE) is observed in the obtained P-CDs. The emission wavelength of a P-CD solution can be tuned in the range from 455 nm to 595 nm by changing the solution concentration.

Spin capacitors, which not only store charges but also spins, have been recently proposed based on the surface/interface magnetoelectric effect. The realization of spin capacitors is, however, not straightforward due to the small change of magnetization under normal electric fields in an ordinary capacitor structure. Here we demonstrate electric-field control of the magnetism in Ni/Cu coaxial cylinders in an electric double layer capacitor (EDLC) configuration. The huge electric field effect generated by EDLCs results in a relative magnetization change as large as 18% after charging at a voltage of 2.0 V. Furthermore, the total magnetization change of the device can be enhanced by increasing the number of Ni/Cu wires and surface/bulk ratio. Our first-principles calculations, together with the results from X-ray photoelectron spectroscopy, X-ray diffraction and transmission electron microscopy, confirm that the magnetization change in this coaxial cylinder structure is due to the surface magnetoelectric effect, indicating that the proposed electric double layer capacitors with Ni/Cu coaxial cylinders have potential applications in spin capacitors at room temperature.

A facile one-pot strategy has been developed for the aqueous synthesis of Gd doped CdTe (Gd:CdTe) QDs as fluorescence and magnetic resonance imaging dual-modal agent. The prepared Gd:CdTe QDs showed narrow size distribution and the average size was less than 5nm. The amount of Gd(3+) dopant in Gd:CdTe QDs significantly affected the optical properties of obtained QDs. The highest PL QY for the prepared Gd:CdTe QDs was up to 42.5%. The QDs showed the weak toxicity and significant enhancement in MRI signal. The specific relaxivity value (r1) was determined to be 4.22mM(-1)s(-1). These properties make the prepared Gd:CdTe QDs be an effective dual-modal imaging agent and have great potential applications in biomedical field.

The reactions of metal salts with Bronsted acidic ionic liquid [HMIM][HSO4] in ethanol were investigated. Zr(OPr)4, ZnCl2 or MnCl2 reacted with [HMIM][HSO4] via an anion exchange and resulted in the formation of imidazole template sulfates [HMIM]2Zr[SO4]3[DMSO]2 (1), [HMIM]2Zn[SO4]2 (2) and [HMIM]2Mn[SO4]2 (3), respectively. On the other hand, Cu(OAc)2 interacted with imidazole to form an imidazole-Cu complex [MIM]4Cu[HSO4]2 (4). The imidazole template sulfates present various crystal structures, in which [HMIM]2Zr[SO4]3[DMSO]2 (1) has zero dimensional monomeric structure made up of [Zr(SO4)3(DMSO)2]2− anions and [HMIM]+ cations. While, [HMIM]2Zn[SO4]2 (2) and [HMIM]2Mn[SO4]2 (3) exhibit one dimensional metal–organic framework which consist of infinite linear chains linked by SO4 units. Compound 4 is an imidazole-metal complex, in which four imidazoles coordinate to Cu(II) to form tetragonal structure compensating the charges with protonated sulfates. Additionally, the magnetic property of compound 3 is investigated to find that it presents a weak antiferromagnetic property probably due to the coupling interactions between the neighboring Mn(II) centers.

The molecular ferroelectric, diisopropylammonium bromide (DIPAB) crystal with P 2 1 phase is successfully prepared in an anhydrous environment at room temperature. The results illustrate that the water in the solvent / environment plays a key role in the phase of DIPAB single crystal during crystallization process. The scaling behavior of the dynamic hysteresis of DIPAB crystal is also investigated. The scaling relations of hysteresis area( A ) against frequency ( f ) and applied electric field amplitude ( E 0 ) can be expressed with A ∝ f − 0 . 17 E 0 1 in the f -region I (30–6.6 Hz), A ∝ f 0 . 045 E 0 0 . 92 in the f -region II (200–50 Hz) and A ∝ f − 0 . 41 E 0 2 in the f -region III (500–250 Hz). This three-stage behavior between the loop area A and frequency is ascribed to the coexistence of order-disorder and displacive characters in the ferroelectric transition characters in such molecular ferroelectrics.

Organometal halide perovskite (OMHP) nanocrystals (NCs) have emerged as promising low-cost optoelectronic materials. However, the poor stability of OMHP NCs has greatly hindered their practical applications. Herein, we report a facile synthesis method of ultrastable OMHP nanocomposites by blending the precursor solution of OMHP and superhydrophobic fumed silica. The superhydrophobic surface of silica affords the perfect framework for the growing of nanocrystals. The OMHP composites with emission colour varying from blue to red were conveniently achieved via adjusting the halide element and content. The superhydrophobic fume silica not only improves the water resistance of the OMHP nanocomposites, but also increases their heat and light stability. The applications as phosphor for fabricating green and white light LEDs were demonstrated.

Lead halide perovskites (LHPs) are very promising for new optoelectronic devices due to their excellent optical and electronic properties. However, the poor stability against water, heat and UV light greatly restricts their practical applications. In this work, a CH3NH3PbBr3/silicon oil/PDMS-urea composite is prepared by encapsulating CH3NH3PbBr3 nanocrystals and silicon oil into the PDMS-urea polymer matrix. This composite shows characteristics of water-enhanced photoluminescence (PL) and water-driven PL recovery. After immersed in water, the photoluminescence quantum yield of the composite increases from initial 26.0%–52.2%, which is ascribed to the passivation of surface defects by the capping of polymer chains, H3O+ and OH−. The composite possesses superior stability against UV light illumination in water. Furthermore, the composite film exhibits a capability of water-driven PL recovery after UV light irradiation. By applying alternate water/UV treatments, the PL can be reversibly switched “on and off”. The “on/off” ratio value of the PL intensity reached more than 4. These advantages make this composite highly promising in applications utilising luminescent switching and for under water lighting.

Organometal halide perovskite nanocrystals are very promising for optoelectronic applications due to their unique optical properties. However, the OHP nanocrystals generally suffer from problems such as nonuniform morphology and poor stability. This work reports the synthesis of MAPbBr3 nanoplatelets through dilution of the irregular colloidal MAPbBr3 nanocrystals prepared at 50 °C. The dilution followed by self-organization of the nanocrystals result in the production of uniform square nanoplatelets with long term stability up to 6 months and high photoluminescence quantum yield about 90%. Furthermore, by using bidentate coordination molecule pyrazole as co-ligand, regular 2D structural Nanocrystals with round edge and aggregation were produced. The aggregated nanoplatelets prepared at 50 °C show the same self-assembly process after dilution to form uniform square nanoplatelets.

Bismuth selenide (Bi2Se3) has attracted great attention as one of typical topological insulator materials. In this work, size-controllable Bi2Se3 nanoflowers (NFs) composed of numerous thin nanosheets are successfully synthesized by a hot-solution injection method under mild conditions. The structure and morphology of the obtained Bi2Se3 NFs are characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopic (EDS), and selected area electron diffraction (SAED) techniques. The reaction temperature, time, and surfactant ratio (oleylamine/oleic acid) affect the phase purity and morphology of Bi2Se3 samples. Based on the experimental results, the formation mechanism of Bi2Se3 nanoflowers is proposed. Meanwhile, the photocatalytic behavior of the as-prepared Bi2Se3 nanoflowers in the presence of H2O2 is explored and it is found that the degrading rate of RhB can reach 93% after 2 h visible light irradiation.

Luminescent nanofluids are successfully prepared by directly dispersing organometal halide perovskite nanocrystals (OHP NCs) with different emission colors in silicone oils. The photoluminescence quantum yields of nanofluids with green, blue and red emission are 47, 32, and 19%, respectively. Furthermore, the nanofluids greatly enhance the stability of OHP NCs and show excellent resistance against moisture, heat and ultraviolet light. The luminescent nanofluids can be used as liquid color converter for LED. By loading them onto silica aerogel, luminescent perovskite powders were achieved. Their applications as phosphor additives for preparing luminescent PMMA composites were demonstrated.

The solvent-induced precipitation in a mixture of good and poor solvents was often used to synthesize organometal halide perovskite nanocrystals (OMHP NCs). Here we investigate the formation of OMHP NCs by using HBr based precursors in various solvents. Various emission colors and morphologies of perovskite NCs were obtained depending on the solvents used. The nanoplatelets with blue emission were produced for the low polar solvents, such as toluene, PhCl and EtOAc. The increase in polarity of poor solvents results in the red shift of emission of obtained NCs. The much more polar solvents like acetone and CH3CN lead to formation of CH3NH3PbBr3 NCs (MaPbBr3) with cubic phase. The dispersion behaviors of MaPbBr3 NCs in different solvents was also investigated. MaPbBr3 NCs can exist stably in most unpolar solvents. However, they will be dissolved in polar solvents, like acetone and acetonitrile, to give rise to a clear solution with red emission of Pb2+. By injecting this clear solution to unpolar solvents, OMHP NCs can be reproduced.

A simple direct writing technique is developed for preparing helically structured nanobelts. The geometric asymmetry and surface strain contribute to the formation of helical structure. The shape of the helically structured nanobelts can be tuned by the nozzle size of micropipette and pulling speed. The applicability and generality of this technique are illustrated by successfully preparing the helical nanobelts of PPy, PVP, PVDF-TrFE, PEG, PMVE-MA and PVA. The potential applications of such helical structures in the area of sensor and energy harvesting are also demonstrated.

This work reports the preparation of crystals of two metal organic frameworks [(NH2CHNH2)][Zn(HCOO)3] (1) and [(NH2CHNH2)2][Cu2(HCOO)6] (2) by using the solvent evaporation method. Under the same experimental conditions, the obtained crystals show different crystal structures. The complex 1 forms 3D structure geometry with one Zn(Ⅱ) ion in the center of an octahedral coordination environment, which is bridged with six nearest Zn(Ⅱ) ions by the formate ligands. The 3D scaffold of the complex 2 consists of two copper ions (Cu1 and Cu2) in the center of an octahedral coordination environment bridged by formate ligands. Magnetic study shows diamagnetic susceptibility for [NH2CHNH2][Zn(HCOO)3] and antiferromagnetic coupling between the Cu(Ⅱ) ions for [(NH2CHNH2)2][Cu2(HCOO)6].

The functional application of metallic glasses in the catalytic field has widely attracted research attention due to its unique atomic structure compared to crystalline materials. It has been reported that metallic glasses can effectively activate H2O2 and persulfate, yet the activation of peroxymonosulfate by metallic glasses is not studied well. In this work, the metallic glass with atomic composition of Fe78Si9B13 was applied for investigating the peroxymonosulfate (PMS) activation on degradation of naphthol green B (NGB) dye. The change of surface morphology indicated the important role of oxide films during the dye degradation. The effects and first-order kinetics model of various reaction parameters were evaluated systematically, including PMS concentration, catalyst dosage, irradiation intensity, and dye concentration. The results showed that about 98% of the dye removal rate could be achieved only within 10 min under rational conditions. The reaction kinetics k of 0.1339 min−1 without ribbons was sharply improved to 0.3140 min−1 by adding 0.5 g/L ribbons, indicating the superior activation ability of Fe78Si9B13 metallic glass. The recycling experiment revealed that the Fe78Si9B13 ribbons exhibited the excellent surface stability and catalytic reusability for activating PMS even after reused for 10th run.