氯化胆碱-尿素中电沉积制备Co-Fe-Ce/NF电极及其析氢性能研究

Preparation of Co-Fe-Ce/NF electrode by electrodeposition in choline chloride-urea and study on its hydrogen evolution properties

为了制备在碱性环境中具备低过电位、高效稳定的电极,在不同的沉积电位下于氯化胆碱-尿素(ChCl-urea)中电沉积制备出5种Co-Fe-Ce/NF电极。通过SEM、EDX、XPS对电极表面形貌、元素质量分数及分布和元素化学状态进行表征,并结合线性扫描伏安法(LSV)、电化学阻抗技术(EIS)和循环伏安法(CV)进行电化学性能测试。结果表明,在-1.20 V的沉积电位下制备的Co-Fe-Ce/NF-2电极表现出优异的析氢催化性能,具备更快的析氢反应动力学过程。对电极进行加速耐久性(ADT)与计时电流法(I-t)测试,结果表明Co-Fe-Ce/NF-2电极在碱性环境中稳定性良好。

In order to prepare electrode with low overpotential,high efficiency and stability in alkaline environment,five kinds of Co-Fe-Ce/NF electrodes are prepared via the electrodeposition method in choline chloride-urea at different deposition potentials.The surface morphology,elemental mass fraction and distribution,and elemental chemical states of the electrodes are characterized by means of SEM,EDX,and XPS,and the electrochemical performances are tested by combining linear scanning voltammetry(LSV),electrochemical impedance spectroscopy(EIS),and cyclic voltammetry(CV).Results show that Co-Fe-Ce/NF-2 electrode prepared at-1.20 V deposition potential possesses a better hydrogen evolution catalytic performance with a faster hydrogen evolution reaction kinetic process.The accelerated durability test(ADT)and timed current method(I-t)tests on the electrode show that Co-Fe-Ce/NF-2 electrode exhibits good stability in alkaline environment.