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Carbon-based printable mesoscopic perovskite solar cells (MPSCs) have attracted significant attention due to their excellent stability and low manufacturing cost. However, the filling and crystallization behavior of perovskite are difficult to finely manipulate due to the confined space of triple-mesoporous layers. Herein, an innovative approach is first proposed to effectively manipulate the crystallization behavior of Cs0.1FA0.9PbI3 perovskite in triple-mesoporous layers by introducing propylamine hydrochloride (PACl). Under the manipulation of PACl, the nucleation density of perovskite crystals was significantly increased, the crystallization rate was delayed, thus the compact filling and preferred crystal orientation growth of the perovskite were realized. Simultaneously, ammonium ions (NH3+) and chloride ions (Cl−) of PACl compensate for ionic vacancies in the perovskite through hydrogen bonds and ionic bonds, thus passivating defects. Consequently, MPSCs with PACl achieved a champion power conversion efficiency of 18.06%, and the open circuit voltage of MPSCs increased from 0.940 V to 0.991 V. The work developed a simple method based on alkylamine hydrochloride to finely manipulate the crystallization of the CsFA-based perovskite. [ABSTRACT FROM AUTHOR]

To improve the electrochemical performances of Mn3O4, combining heterojunction structure with the carbon fiber is a good method; the heterojunction structure presents good electron conductivity, and carbon fiber can alleviate particle aggregation, thus improving electrochemical performances. Herein, the mixed transition metal oxide Fe2O3/Mn3O4/C composites with heterojunction structure are designed through carbonization at high temperature after in situ growth on lignocellulose by simple hydrothermal method. The results of phase analysis show that the synthesis of target product is successful. At the same time, the morphology, element distribution and graphitization degree of the material are characterized, respectively. The analysis of morphology verifies the existence of the heterojunction structure, and the results of electrochemical performances show that Fe2O3/Mn3O4/C anode material has excellent performance. The specific capacity of Fe2O3/Mn3O4/1C can be maintained at 917.53 mAh g−1 at 100 mA g−1, and the capacity retention ratio can be maintained at 137.9% after 200 cycles. [ABSTRACT FROM AUTHOR]

In this study, CO2‐ and Fe3O4‐assisted corrosion of the cement–casing interface for the magnetite (Fe3O4) high‐density cement–casing steel system in simulated formation water is investigated under the normal and high CO2 pressure conditions. Results show that the degradation of the cement–casing interface is affected by the competition of cement hydration and CO2 corrosion. The migration of CO2 and corrosive species to the cement–casing interface is facilitated under the high pressure condition, resulting in enhanced corrosion rate as compared to the normal pressure condition. The casing steel is in active corrosion state while the corrosion rate gradually increases with time. After long term of immersion, a layer of thick corrosion products with multiple cracks/microgaps forms at the cement–casing interface, which can hardly protect the casing steel from further corrosion. The corrosion products on the steel surface are mainly FeCO3 accompanied by a small amount of CaCO3 and Fe3O4, suggesting the prevalence of CO2 corrosion. The mechanism of the CO2‐ and Fe3O4‐facilitated corrosion of the cement–casing interface for the magnetite high‐density cement–casing system is proposed. [ABSTRACT FROM AUTHOR]

The recovery of metals from spent LiFePO4 batteries is arousing increasing concern due to its great market consumption, environmental impact, and wastage of valuable metallic resources. This work proposed an effective recycling approach for metals and promoted a simplified regenerative process. The innovative use of H4P2O7 as a leaching agent achieves the leaching of metals and their separation in one step. Under a modified leaching condition, the leaching efficiency of Li is close to 100%, and the precipitation amount of Fe is more than 97%. Then, the separated Fe in the form of Fe4(P2O7)3 and recovered Li2CO3 were used to regenerate LiFePO4 cathode material. It delivers an initial capacity of 167.8 mAh g−1 at 0.1 C and remains 91.31% after 100 cycles; the dynamic property and cycling stability are comparable to the unused commercial material. The application of H4P2O7 achieves separation of Li and Fe metals in parallel with leaching process with higher leaching efficiency and selectivity for the metals than the conventional leaching acids in hydrometallurgy technology. [ABSTRACT FROM AUTHOR]

Cubic phase zinc peroxide nanoparticles (ZnO 2 NPs) with an average diameter of ca. 9–15 nm have been synthesized via a fast nanosecond pulse laser ablation in liquid technique (PLAL), using H 2 O 2 aqueous solution as the ablation media and a 532 nm pulsed laser as the irradiation source and low-cost zinc powder as the solid target. Both the laser energy and ablation time potentially have a substantial influence on the formation of ZnO 2 NPs. Due to its relatively high oxidation level as well as its hydrophilic wetting behavior, the as-synthesized ZnO 2 NPs exhibit efficient photocatalytic degradation ability of Rhodamine B (RB) whilst remaining stable to photodegradation. The possible mechanisms of the photocatalytic behavior have been discussed in what follows. [ABSTRACT FROM AUTHOR]