Using interface engineering,a highly efficient catalyst with a shell@core structure was successfully synthesized by growing an amorphous material composed of Ni,Mo,and P on Cu nanowires(Ni-MoP@CuNWs).This catalyst only requires an overpotential of 35 mV to reach a current density of 10 mA cm^(-2).The exceptional hydrogen evolution reaction(HER)activity is attributed to the unique amorphous rod-like nature of NiMoP@CuNWs,which possesses a special hydrophilic feature,en-hances mass transfer,promotes effective contact between the electrode and electrolyte solution,and exposes more active sites during the catalytic process.Density functional theory revealed that the introduction of Mo weakens the binding strength of the Ni site on the catalyst surface with the H atom and promotes the desorption process of the H_(2) product significantly.Owing to its facile syn-thesis,low cost,and high catalytic performance,this electrocatalyst is a promising option for com-mercial applications as a water electrolysis catalyst.
降低催化剂中贵金属Pt含量是构建高性能析氢反应(Hydrogen evolution reaction,HER)电催化剂的关键。通过电化学沉积法将Cu纳米修饰到二维Nb_(2)CT_(x)表面,然后利用电化学置换反应制备得到二维Nb_(2)CT_(x)负载Pt纳米颗粒(PtNP/Nb_(2)CT_(x))催化剂。采用SEM、XRD和XPS等手段对所得催化剂的形貌、结构及组成进行表征,并研究了PtNP/Nb_(2)CT_(x)催化剂在酸性和中性介质中的电催化HER性能。结果表明,在10 m A·cm^(-2)电流密度下,PtNP/Nb_(2)CT_(x)催化剂在0.5 mol·L^(-1)H2SO4和1.0 mol·L^(-1)PBS电解液中的过电压分别为38 m V和146 m V,Tafel斜率分别为42和64 m V·dec^(-1);在0.5 mol·L^(-1)H2SO4中,过电压为50 m V下,催化剂的质量活性和转换频率值分别为36.5 A·mgPt^(-1)和11.5 s^(-1);在1.0 mol·L^(-1)PBS中,过电压为100 m V下,催化剂质量活性和转换频率分别为4.1 A·mgPt^(-1)和4.2 s^(-1),PtNP/Nb_(2)CT_(x)催化剂表现出优异的HER活性。最后在电流密度为10 m A·cm^(-2)下,0.5 mol·L^(-1)H2SO4和1.0 mol·L^(-1)PBS电解液中通过计时电流法进行5 h的稳定性测试,该催化剂均表现出良好的稳定性。该催化剂的成功合成为制备低Pt含量高性能电催化析氢材料提供了新的思路和研究方法。
