Ni_100−xFe_x alloy catalysts are prepared as an alternative to Pt-based catalysts for the hydrogen evolution reaction (HER) in water electrolysis. For optimum bonding and adhesion stability between a carbon paper (CP) electrode and Ni_100−xFe_x alloy particles, the latter (obtained by varying the Ni/Fe ratio) is directly grown onto the CP electrode hydrothermally. The shape, crystallinity, and electrochemical properties of the alloy particles were analyzed using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and linear sweep voltammetry (LSV). Raman spectroscopy identifies that very few crystal defects are generated in the Ni_100−xFe_x alloy catalyst during the HER, resulting in a significant improvement in the alloy's electrocatalytic performance. The XPS alloy catalyst profiles before and after the HER reveal water is easily adsorbed on the Fe²⁺ component, and more H₂ is generated on the Ni⁰ component. The optimum Ni₉₀Fe₁₀/CP catalyst electrode exhibits an overpotential of − 0.244 V (η = 246 mV) and a Tafel slope of 95.4 mV dec⁻¹ at 100 mA cm⁻² in a 1.0 M KOH electrolyte. Moreover, the electrode shows a Faradaic efficiency of 97.07% and excellent catalytic activity over 10 days and after 3000 LSV cycles.

制备了Ni _100-x Fe _x合金催化剂，作为水电解中析氢反应（HER）的基于Pt的催化剂的替代品。为了使碳纸（CP）电极和Ni _100-x Fe _x合金颗粒之间具有最佳的结合和粘附稳定性，可通过热液法将后者（通过改变Ni / Fe比获得）直接生长在CP电极上。使用扫描电子显微镜，透射电子显微镜，X射线衍射，拉曼光谱，X射线光电子能谱（XPS）和线性扫描伏安法（LSV）分析了合金颗粒的形状，结晶度和电化学性能。拉曼光谱法可确定在Ni _100-x中几乎不会产生晶体缺陷在HER期间使用Fe _x合金催化剂，可显着改善合金的电催化性能。HER之前和之后的XPS合金催化剂曲线表明，水很容易吸附在Fe ²⁺组分上，而Ni ⁰组分上会生成更多的H ₂。最佳的Ni ₉₀ Fe ₁₀ / CP催化剂电极在1.0 M KOH电解质中，在100 mA cm ^-2下表现出-0.244 V（η= 246 mV）的过电势和95.4 mV dec ^-1的Tafel斜率。此外，该电极在10天之内和3000个LSV循环后，显示出97.07％的法拉第效率和出色的催化活性。