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.

中文翻译：

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碱性介质中氢析出反应的三维分层纳米结构Cu / Ni-Co涂层电极。

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层镍钴合金涂层。随着钴含量的增加，涂层的形态从海参状的纳米结构演变为毛虫状的结构。观察到大量的纳米级“步骤”充当了析氢反应的活性位点。根据Tafel极化测量，具有层级纳米结构的刚合成涂层的交换电流密度是平面镍涂层的21.9倍。此外，根据恒电流测试，分层涂层还显示出良好的电化学稳定性。