Self-supporting hierarchically micro/nano-porous Ni3P-Co2P-based film with high hydrophilicity for efficient hydrogen production
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第6期
论文作者：Xiangtao Yu Xiangyu Ren Yanwei Zhang Zhangfu Yuan Zhuyin Sui Mingyong Wang
摘 要：Designing efficient and stable non-precious metal HER（hydrogen evolution reaction） electrocatalysts with high large current density adaptability is significant for industrial application of hydrogen production by water electrolysis. Herein, a facile strategy was developed to construct a multi-phase Ni3 P-Co2 P-（Ni-Co） film with self-supporting hierarchically micro/nano-porous structure by using bubble template method electrodeposition of self-supporting micro-porous Ni Co P film, oxygen-free annealing for phase separation producing Ni3 P-Ni-Co2 P-Co structure, and acid etching for constructing surface nano-porous structure. The effective active sites for HER was significantly increased due to the hierarchically micro/nano-porous structure, which not only enlarged the surface roughness, but enhanced the bubble detachment by improving the hydrophilicity. Meanwhile, the HER electrolysis durability was improved benefiting from the Ni3 P-Co2 P phases with high corrosion resistance（especially in acid solution） and the self-supporting film structure without binder. Consequently, the Ni Co P-OA-AE film exhibited high HER catalytic performance, which delivered a current density of 10 m A cm-2 at a low overpotential of 42.9 and 39.7 m V in 1 M KOH and 0.5 M H2 SO4, respectively. It also possessed high long-term electrolysis durability, and the cell voltage of water electrolysis using self-supporting porous Ni Co P-OA-AE||Ir O2-Ta2 O5 electrolyzer at 500 m A cm-2 for 250 h in 0.5 M H2 SO4 is only 2.9 V.
Xiangtao Yu1，Xiangyu Ren1，Yanwei Zhang1，Zhangfu Yuan1，Zhuyin Sui2，Mingyong Wang3
1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing2. School of Chemistry & Chemical Engineering, Yantai University3. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing
摘 要：Designing efficient and stable non-precious metal HER（hydrogen evolution reaction） electrocatalysts with high large current density adaptability is significant for industrial application of hydrogen production by water electrolysis. Herein, a facile strategy was developed to construct a multi-phase Ni3 P-Co2 P-（Ni-Co） film with self-supporting hierarchically micro/nano-porous structure by using bubble template method electrodeposition of self-supporting micro-porous Ni Co P film, oxygen-free annealing for phase separation producing Ni3 P-Ni-Co2 P-Co structure, and acid etching for constructing surface nano-porous structure. The effective active sites for HER was significantly increased due to the hierarchically micro/nano-porous structure, which not only enlarged the surface roughness, but enhanced the bubble detachment by improving the hydrophilicity. Meanwhile, the HER electrolysis durability was improved benefiting from the Ni3 P-Co2 P phases with high corrosion resistance（especially in acid solution） and the self-supporting film structure without binder. Consequently, the Ni Co P-OA-AE film exhibited high HER catalytic performance, which delivered a current density of 10 m A cm-2 at a low overpotential of 42.9 and 39.7 m V in 1 M KOH and 0.5 M H2 SO4, respectively. It also possessed high long-term electrolysis durability, and the cell voltage of water electrolysis using self-supporting porous Ni Co P-OA-AE||Ir O2-Ta2 O5 electrolyzer at 500 m A cm-2 for 250 h in 0.5 M H2 SO4 is only 2.9 V.
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