ZnSe/Pt电极制备及抑氢行为探讨

Study on electrodeposition and mechanism of inhibiting hydrogen on ZnSe/Pt pole

探讨ZnSe/Pt电极的抑氢行为,采用三电极体系,分别以Pt电极、Zn/Pt电极和ZnSe/Pt电极为研究电极,以大面积Pt片为阳极.以饱和甘汞电极为参比电极,测定了3类电极的析氢稳态极化曲线.结果表明,在酸性柠檬酸钠溶液中,氢在各阴极上的析出难度顺序是:ZnSe/Pt电极>Zn/Pt电极>Pt电极.ZnSe/Pt电极的析氢过电位比Zn/Pt电极的大,即抑氢能力更强.Zn和Se的键合,使得氢原子中的电子无法与其形成"吸附键"而吸附于ZnSe上,氢气在ZnSe阴极上的析氢过电位增大.

The inhibiting hydrogen behavior of the ZnSe/Pt electrode was studied by the stable state polarization curves of hydrogen evolution in the system of three electrodes,in which the studied electrodes were the Pt electrode,the Zn /Pt electrode and the ZnSe/Pt electrode,and the anode was Pt piece of the large area and the reference electrode was the saturated calomel electrode.The results show that the difficulty order of hydrogen evolution on various cathode is ZnSe/PtZn /PtPt electrode in acid sodium citrate solution.In addition,ZnSe/Pt Pole has a higher hydrogen evolution overpotential than Zn/Pt.In other words ZnSe/Pt Pole has the stronger inhibiting hydrogen ability.This reason is that the electron in the hydrogen atom could not form ＂adsorption bond＂ due to the linkage of Zn and Se,based on which the overpotential of hydrogen evolution increases on the ZnSe.