泡沫镍上原位制备FeOOH/MoSe_(y)及电解水双催化性能研究

In Situ Preparation of FeOOH/MoSe_(y) on Nickel Foam for Bifunctional Electrocatalytic Water Splitting

为设计同时具有优异电催化析氢和析氧性能的过渡金属基催化剂,以泡沫镍为载体和集流体,原位制备了硒化钼(MoSe_(y))和羟基氧化铁(FeOOH),得到FeOOH/MoSe_(y)@Ni复合材料。表征结果表明,先通过电沉积法原位生长了MoSe_(y)层,再以该MoSe_(y)层为成核点,通过常温浸泡生长形成了由FeOOH纳米片组成的微米绒球。在三电极体系中,以1 mol·L^(-1) KOH溶液为电解液,该FeOOH/MoSe_(y)@Ni复合材料表现出优异的电催化析氢和析氧性能,析氢电流密度在10 mA·cm^(-2)时的过电位(η_(10))为128 mV,析氧电流密度在20 mA·cm^(-2)时的过电位(η_(20))为306 mV,并具有较小的Tafel斜率、较大的双电层电容(C_(dl))值和良好的稳定性。FeOOH/MoSe_(y)@Ni优异的电催化性能主要由于三维开放的泡沫镍骨架和原位制备的MoSe_(y)层和FeOOH微米绒球相结合,可提供丰富的催化活性中心、良好的导电性、离子传输以及稳定性。

Aiming to designing transition metal-based catalysts with excellent electrocatalytic performances of both hydrogen evolution and oxygen evolution,molybdenum selenide(MoSe_(y))and hydroxyl oxidize iron(FeOOH)were in situ prepared on nickel foam as support and current collector,and hence obtained FeOOH/MoSe_(y)@Ni composite.The characterization results show that the MoSe_(y) layer was first grown on Ni foam by in situ electrodeposition method,and then the MoSe_(y) layer was used as nucleation points for formation of FeOOH micron pompoms composed of nanosheets by immersion growth at room temperature.By evaluation in a three-electrode system,with 1 mol·L^(-1) KOH solution as the electrolyte,the FeOOH/MoSe_(y)@Ni composite showed excellent electrocatalytic hydrogen and oxygen evolution performances,with an overpotential(η_(10))of 128 mV for hydrogen evolution at a current density of 10 mA·cm^(-2),an overpotential(η_(20))of 306 mV for oxygen evolution at a current density of 20 mA·cm^(-2),the,a small Tafel slope,a large double-layer capacitance(C_(dl))value and good stability.The excellent electrocatalytic performance of FeOOH/MoSe_(y)@Ni is mainly due to the combination of three-dimensional open nickel foam skeleton,in situ prepared MoSe_(y) layer and FeOOH micron pompons,which can provide with abundant catalytic active centers,good electrical conductivity,ion transport,and stability.