Wang Ning, Hang Tao, Chu Dewei, Li Ming
1State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Shanghai Jiao Tong University, Shanghai, 200240 People's Republic of China.
2School of Materials Science & Engineering, University of New South Wales, Sydney, NSW 2052 Australia.
Nanomicro Lett. 2015;7(4):347-352. doi: 10.1007/s40820-015-0049-1. Epub 2015 Jun 30.
In this work, three-dimensional hierarchical nickel-cobalt alloy coating for hydrogen evolution cathode was fabricated by electrodeposition processes. The coatings' morphology evolves from sea cucumber-like nanostructure to caterpillar-like one with the increase of cobalt content. A large amount of nanometric "steps," served as the active sites for hydrogen evolution reaction, were observed. According to Tafel polarization measurements, the exchange current density of the as-synthesized coating with hierarchical nanostructure was 21.9 times compared with that of flat nickel coating. In addition, the hierarchical coating also displayed good electrochemical stability from the galvanostatic test.
在这项工作中，通过电沉积工艺制备了用于析氢阴极的三维分级镍钴合金涂层。随着钴含量的增加，涂层的形态从海参状纳米结构演变为毛虫状结构。观察到大量纳米级“台阶”，它们作为析氢反应的活性位点。根据塔菲尔极化测量，具有分级纳米结构的合成涂层的交换电流密度是平整镍涂层的21.9倍。此外，恒电流测试表明分级涂层还具有良好的电化学稳定性。
