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We prepared a 3D FeZn–N–C based catalyst by green in situ growth of 1D Fe–N–C carbon nanotubes by introducing ferrocyanide ions on the surface of 2D exfoliated MOF-5. The 1D/2D FeZn–N–C based electrocatalyst is conducive to O2 diffusion and ionic/electron transfer, exhibiting an excellent ORR catalytic performance and a peak power density of 294 mW cm−2 for Zn–air batteries. [ABSTRACT FROM AUTHOR]

Ruddlesden‐Popper (RP) hybrid perovskites have the characteristics of controllable quantum well thickness, excellent stability, and good photoelectric performance. However, traditional space‐limited methods easily induce additional defects at the crystal interface. Herein, a novel swimming top‐down method is proposed for growing high‐quality perovskite single‐crystal sheets in a biphasic liquid–liquid n‐dodecane/γ‐butyrolactone (GBL) system. The (BA)2MAPb2I7 single‐crystal sheet exhibited the lowest defect density on the top surface because of interfacial features, including a flat biphasic confined interface, a large area for GBL molecule diffusion, and sufficient traction for swimming growth. As a typical result, (BA)2MAPb2I7 single‐crystal‐based photodetectors exhibit outstanding weak‐light photoelectric performance with a responsivity of 1.02 A W−1, an external quantum efficiency of 226.9%, and a detectivity of 8.7 × 1012 Jones; these values are 310%, 310%, and 700%, respectively, as high as those of photodetectors obtained by the antisolvent vapor‐assisted crystallization method. [ABSTRACT FROM AUTHOR]

Carbon fibers (CFs) have been innovated in the application of fiber‐shaped and wearable energy storage devices recently. However, time‐ and energy‐consuming activation process under harsh conditions is generally required to modify the surface structure of the CF. Herein, a fast and effective Joule heating activation method is proposed with the nickel–cobalt layered double hydroxide‐derived nanometal particles as the template. The resultant Joule heating‐activated CF (JACF) demonstrates excellent capacitive performance with an electrode capacitance of 268 F g−1. After assembling into a solid‐state fiber‐shaped supercapacitor (FSC), the device shows both enhanced specific capacitance and energy/power densities, as well as the long cycling stability of over 5000 cycles. The Joule heating method reported in this work is time and energy saving for CF activation compared with the traditional chemical etching or high‐temperature annealing processes, and it is promising for the large‐scale production of high‐performance fiber‐shaped and wearable energy devices. [ABSTRACT FROM AUTHOR]

It is a challenge to synthesize high-quality MAPbX3 single-crystal microwires (MWs) under gentle conditions owing to their sensitivity to humidity and brittleness. We herein propose a facile bilayer flexible polymer confinement method to obtain high-quality MAPbI3 single-crystal microwires in air. The MAPbI3 microwire-based photodetector exhibits a superior responsivity of 77.96 A W−1, an EQE of 1.86 × 104%, and an ultrahigh detectivity of 6.97 × 1013 Jones owing to the efficient carrier transport and excellent crystallinity with few defects. Furthermore, photodetectors based on the MAPbI3 microwire arrays present superior performance with a detectivity of 3.09 × 1013 Jones, which is more than 160% and 7700% higher than that of the photodetectors based on the MAPbI3 microwires and polycrystalline film at 254 μW cm−2. [ABSTRACT FROM AUTHOR]

Hierarchically macro–meso–microporous ZIF-67/nori-derived electrocatalysts were synthesized by using single-cell-array nori and ZIF-67 as macroporous and microporous templates, and KOH as a meso/micropore-forming reagent. The ZIF-67/nori-800-based Zn–H2O2 battery achieved a high maximum power density, of 476 mW cm−2, and a specific energy density of 964 W h kg−1 at 50 mA cm−2. [ABSTRACT FROM AUTHOR]

A facile double flexible interfacial imprinting method is reported to obtain the cubic single‐crystal CH3NH3PbBr3 sheets with in situ polymer patterns by capillary effect. The imprinted CH3NH3PbBr3 sheets offer good crystallinity and light‐trapping structure. As a result, the textured single‐crystal photodetector exhibits the superior responsivity of 63.0 A W−1, external quantum efficiency of 1.50 × 104%, and detectivity D* of 8.12 × 1012 Jones under 520 nm irradiations with a weak power density of 0.54 µW cm−2 at 3 V, which are more than 4200% and 80000% higher than those of the photodetector based on single‐crystal bulk and polycrystalline film, respectively. The exciting ultraweak‐light photoelectric performance is achieved due to the good light trapping and high carrier collection. Especially, the photodetector also exhibits excellent self‐powered performance. [ABSTRACT FROM AUTHOR]

Adding a functionalized interlayer is one of the effective means to solve the problem of capacity attenuation caused by the shuttle of polysulfides in lithium–sulfur (Li–S) batteries. Moreover, the interlayer has the potential to take on more roles, such as having good mechanical flexibility to ensure high safety and flame-retardant property to improve the high temperature performance of the battery. Thus, in this work, an MXene/Co3O4–CNT film interlayer that is capable of dual chemisorption to polysulfides with good mechanical strength and flame retardancy has been investigated. The resultant Li–S battery assembled with this interlayer exhibits a high discharge capacity of 1569.5 mA h g−1, an excellent charge–discharge stability over 600 cycles, and a high temperature stability of the electrochemical performance. [ABSTRACT FROM AUTHOR]