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Self-supporting hierarchically micro/nano-porous Ni_(3)P-Co_(2)P-based film with high hydrophilicity for efficient hydrogen production

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Journal of Materials Science & Technology 2021年第6期65卷 118-125页

作者： Xiangtao Yu Xiangyu Ren Yanwei Zhang Zhangfu Yuan Zhuyin Sui Mingyong Wang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Chemistry&Chemical Engineering Yantai UniversityYantai 264005China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

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 ***,a facile strategy was developed to construct a multi-phase Ni3 P-Co_(2)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 Ni_(3)P-Ni-Co_(2)P-Co structure,and acid etching for constructing surface nano-porous *** 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 ***,the HER electrolysis durability was improved benefiting from the Ni_(3)P-Co_(2)P phases with high corrosion resistance(especially in acid solution)and the self-supporting film structure without ***,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 H_(2)SO_(4),*** also possessed high long-term electrolysis durability,and the cell voltage of water electrolysis using self-supporting porous Ni Co P-OA-AE||Ir O_(2)-Ta_(2)O_(5) electrolyzer at 500 m A cm^(-2)for 250 h in 0.5 M H_(2)SO_(4 )is only 2.9 V.

关键词： Self-supporting Micro/nano-porous film High hydrophilicity bubble detachment High HER(hydrogen evolution reaction) catalytic performance

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An Analytical Solution of the Potential Velocity Field Induced by a Growing bubble from a Plate Orifice

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Journal of Thermal Science 1993年第3期2卷 157-164页

作者： Zhi Tao Division 402, Beijing University of Aeronautics & Astronautics, Beijing 100083, China Ning Kang Division 506, Beijing University of Aeronautics & Astronautics, Beijing 100083, China Division 402 Beijing University of Aeronautics & Astronautics Beijing China Division 506 Beijing University of Aeronautics & Astronautics Beijing China

An analytical solution is derived with the mirror image method of the velocity field of an inviscid liquidinduced by a growing bubble from a plate orifice. The flow is assumed potential, and the bubble shapeis idealised as spherical. In deriving the motion equation, the spherical image of a point source, whichis a combination of a point source and a line source, is proved approximate to a double source. Thisapproximation enables continuation of the effectiveness of mirror image method to the case studiedin this paper. The derived velocity potential equation is verified for the boundary conditions on thebubble surface and the orifice plate. The streamlines of the velocity field are presented and comparedwith experimental results in the literature.

关键词： bubble formation bubble detachment bubble collapse plate orifice velocity field

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