The HER Property of Electrodeposited Ni-P Electrode with Micro-patterned Structure
Ni-P alloy has been shown to be a potential electrode material for hydrogen production from electrolysis. The enhancement of its electrocatalytic efficiency with micro-patterned structures fabricated using microelectromechanical system (MEMS) process was investigated in this study. The cylindrical columns with diameter of 65μm and spacing of 105μm were fabricated in rectangular array and two different heights. From the potentiodynamic polarization curves measured in 0.5M H2SO4 solution, the current density at -0.75VSCE was increased from 181mA cm-2 to 426 mA cm-2, planar electrode to micro-structured electrode, which denoted a 2.35 times increase for hydrogen evolution reaction (HER) efficiency. It was noted that enhancement in HER efficiency was higher than the corresponding increment in apparent surface area. The electric field concentration at the edges of the columnar structure could contribute to the raise in efficiency. However, as the overplating occurred, the narrowing of the spacing between the top portions of the microcolumns could impede the electric flux into their bottom parts. Part of the surface area became less active in HER. Therefore, suitable configuration design in the micro-pattern is desired.
Chun-Ying Lee Chen-Hsiang Hsu Mei-wen Wu
Department of Mechanical Engineering National Taipei University of Technology Taipei, Taiwan, Republ Dept.of Mechanical and Automation Engineering Da-Yeh University Chang-hua, Taiwan, Republic of China Chien-Kuo University Chang-hua, Taiwan, Republic of China
国际会议
武汉
英文
1-4
2010-05-10（万方平台首次上网日期，不代表论文的发表时间）