Qian Liu,Wenqian Luan,Xingrong Zhang,Ruiyang Zhao,Jishu Han,Lei Wang
The design of a low-cost, efficient and durable co-catalyst for hydrogen evolution is of great significance for improving photocatalytic activity. In this work, a NiMoP 2 /Cu-ZnS composite photocatalyst was prepared by in-situ growth of NiMoP 2 on the surface of copper-doped zinc sulfide (Cu-ZnS). The test results showed that the hydrogen production rate of the optimized NiMoP 2 /Cu-ZnS under visible light irradiation was significantly improved. Among them, NiMoP 2 /Cu-ZnS-1 exhibited the highest photocatalytic activity (5.13 mmol·g −1 ·h −1 ), which was 2.47 times that of Cu-ZnS and maintained good stability during the reaction. The improvement of hydrogen production performance of the photocatalyst was mainly attributed to the synergistic effect of Cu-ZnS and co-catalyst NiMoP 2 . The ohmic contact formed between Cu-ZnS and NiMoP 2 could improve the separation efficiency of photogenerated carriers and reduce the overpotential of H 2 evolution. Besides, NiMoP 2 was found to provide the active site for the reduction reaction, and accelerate the transfer efficiency of photogenerated electrons. This strategy opens up a new way for the construction of co-catalyst modified semiconductor materials to improve the photocatalytic hydrogen production rate.
Hao Zhang,Hongfei Xu,DongJian Kang,Zhenxia Wang,Zizai Ma,Xiaoguang Wang
Graphical Supercapacitor Electrode: Litchi-skin-like morphology NiMoP 2 microspheres loaded on MOF-derived carbon layers for enhancing the electrochemical performance of ASCs. Developing ideal positive electrodes with excellent performance and structural stability for supercapacitors is crucial in enhancing the application potential. Herein, we successfully fabricate a composite structure of NiMoP 2 @C on nickel foam (NF) (NMP@C/NF), which is formed by loading a litchi-skin-like morphology NiMoP 2 microspheres onto MOF-derived carbon layer with the two-step electrodeposition method. The carbon layer acts as a structurally stable framework, and its synergistic effect with active materials suppresses volume expansion while enhancing electron transport efficiency. Meanwhile, the heterogeneous interface between crystalline/amorphous phases optimizes redox reaction kinetics, and the unique morphology composed of multi-scale components increases the accessible surface area for redox reactions. As a result, the NMP@C/NF obtains a high specific capacitance of 2224.8 F g −1 at 1 A g −1 , and the capacitance retention rate is 94.97% after 8000 cycles. The asymmetric supercapacitor (ASC) assembled with NMP@C/NF positive electrode and active carbon negative electrode generates an energy density of 52.52 Wh kg −1 at a power density of 784.55 W kg −1 , and its capacitance retention rate reaches up to 78% after 8000 cycles. This study provides promising pathway for the rational design of high-performance and environmentally friendly positive electrodes for supercapacitors.
Xu-Dong Wang,Hong-Yan Chen,Yang-Fan Xu,Jin-Feng Liao,Bai-Xue Chen,Hua-Shang Rao,Dai-Bin Kuang,Cheng-Yong Su
Designing and exploring efficient and stable non-noble bifunctional catalysts by nanostructure modification and chemical composition tuning for water splitting is of critical importance for sustainable resources. Herein, pure phase nickel molybdenum phosphide (NiMoP2) nanowires on carbon cloth are successfully synthesized through a simple and highly reproducible in situ P/O exchange process. Such a NiMoP2 nanowire catalyst requires low overpotentials of 199 and 330 mV to obtain a high current density of 100 mA cm−2 towards the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively, and is among the most active HER and OER electrocatalysts yet reported. The bifunctional NiMoP2 is used as both anode and cathode catalysts in a two-electrode water electrolysis configuration, which delivers a current density of 10 mA cm−2 under a potential of 1.67 V. Furthermore, the overall water-splitting of the bifunctional NiMoP2 nanowire catalyst is further driven by a dry battery with a nominal voltage of 1.5 V which exhibits excellent performance and durability in a strong alkaline electrolyte.
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