It is highly important to develop low-cost hydrogen evolution cathode materials. In this paper, Ni(OH)/NF electrode was prepared by a hydrothermal method using nickel foam (NF) as a substrate, and NiTe-Ni(OH)/NF cathode with high efficiency and low cost was prepared by secondary hydrothermal method. The material was characterized by physical characterization and electrochemical performance tests. Ni(OH)/NF electrode materials prepared by a one-step hydrothermal method had a three-dimensional petal-like pore space structure. This special structure provided abundant active points for the two-step hydrothermal preparation of NiTe-Ni(OH)/NF, which helps to improve the efficiency of HER. Compared with NF and Ni(OH)/NF, NiTe-Ni(OH)/NF cathode exhibited better HER catalytic performance. The results shown that NiTe-Ni(OH)/NF is possesed excellent hydrogen evolution performance, and density functional theory can confirm this. At a current density of 10 mV∙cm, the NiTe-Ni(OH)/NF electrode has an overpotential of only 129 mV, long-term stability, and an electrochemically active specific surface area (ECSA) of 91.75 cm. The Tafel slope was 31.5 mV∙dec, and the charge transfer resistance obtained by electrochemical impedance analysis was 9.81 Ω. This article provided valuable insights into the rational regulation of crystal phases on nickel telluride to improve HER properties.

中文翻译：

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析氢电催化剂NiTe-Ni(OH)2/NF活性正极材料的制备

开发低成本的析氢阴极材料非常重要。本文以泡沫镍(NF)为基体，采用水热法制备了Ni(OH)/NF电极，并采用二次水热法制备了高效、低成本的NiTe-Ni(OH)/NF阴极。通过物理表征和电化学性能测试对该材料进行了表征。一步水热法制备的Ni(OH)/NF电极材料具有三维花瓣状孔隙结构。这种特殊的结构为两步水热制备NiTe-Ni(OH)/NF提供了丰富的活性点，有助于提高HER效率。与NF和Ni(OH)/NF相比，NiTe-Ni(OH)/NF阴极表现出更好的HER催化性能。结果表明NiTe-Ni(OH)/NF具有优异的析氢性能，密度泛函理论也证实了这一点。在电流密度为10 mV∙cm时，NiTe-Ni(OH)/NF电极的过电位仅为129 mV，具有长期稳定性，电化学活性比表面积（ECSA）为91.75 cm。塔菲尔斜率为31.5 mV∙dec，电化学阻抗分析得到的电荷转移电阻为9.81 Ω。本文为合理调控碲化镍晶相以改善 HER 性能提供了宝贵的见解。