外国语学院知识库

Nanoporous Ni, Co and Ni-Co alloys were prepared by rapid solidification combined with de -alloying. The surface of Ni-Co alloy was modified by RuO2. The phase analysis and morphology of porous materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS),scanning electron microscope (SEM) and transmission electron microscope (TEM). The electrocatalytic hydrogen evolution performance of the porous electrode was tested by linear sweep voltammetry, multi -potential step, alternating current impedance and potentiostatic electrolysis. The results show that the Ni-Co/RuP2 composite electrode material has a hydrogen evolution overpotential of 180 mV at a current density of 50 mA .cm(-2). The hydrogen evolution process was controlled by the Volmer-Heyrovsky step, and the exchange current density was 4.42 mA . cm(-2). Compared with nanoporous Ni, nanoporous Co and nanoporous Ni-Co alloy, Ni-Co/RuO2 composite electrode had the lowest apparent activation energy during hydrogen evolution. After 10 h constant current electrolysis, the potential only increased by 20 mV, showing excellent hydrogen evolution stability.