Abstract Porous Ni-Co alloy with low overpotential for hydrogen evolution reaction (HER) were fabricated by dynamic hydrogen bubble template (DHBT) method, which has the potential of being used to obtain hydrogen energy efficiently and environmentally friendly. The porous Ni-Co alloy was prepared by one-step electrodeposition at different current density and electroplating time. Scanning electron microscopy (SEM) was used to observe the diverse morphology of the electrodes obtained by different conditions, while its catalytic activity for HER was investigated by electrochemical measurements. Results showed the positive correlation between active sites of micro-morphology of porous Ni-Co electrode and its catalytic performance for HER. Based on the results, current density of 250 A/dm2 and electroplating time of 120 s were chosen as the optimum conditions, with the overpotential of only 54 mV for HER. Additionally, the porous Ni-Co alloy electrode showed high catalytic stability with a small activity loss after 10 h chronopotentiometry stability test. With prominent electrochemical properties and facile preparation method, porous Ni-Co alloy electrode fabricated by DHBT has the potential of being widely applied in hydrogen evolution reaction.

中文翻译：

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高性能析氢反应多孔镍钴催化电极的制备

摘要 采用动态氢气泡模板法(DHBT)制备了析氢反应(HER)过电位低的多孔Ni-Co合金，具有高效、环保地获取氢能的潜力。采用不同电流密度和电镀时间一步电沉积制备多孔Ni-Co合金。使用扫描电子显微镜 (SEM) 观察不同条件下获得的电极的不同形态，同时通过电化学测量研究其对 HER 的催化活性。结果表明多孔Ni-Co电极微观形貌的活性位点与其对HER的催化性能呈正相关。根据结果​​，选择电流密度 250 A/dm2 和电镀时间 120 s 作为最佳条件，HER 的过电位仅为 54 mV。此外，多孔镍钴合金电极在 10 小时计时电位稳定性测试后表现出较高的催化稳定性和较小的活性损失。DHBT制备的多孔Ni-Co合金电极具有优异的电化学性能和简便的制备方法，具有广泛应用于析氢反应的潜力。