(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 以氧化镨、氧化铒为添加剂，在泡沫镍基体上电沉积制备Ni-S镀层电极。对镀层的表面形貌、镀层结构、电沉积行为及镀层的电化学性能进行研究。结果表明：电镀液中添加稀土氧化物后电沉积过程的阴极极化增强，沉积层晶粒细化，比表面积增大，因而电极的析氢过电位降低；其中，添加Pr2O3的Ni-S镀层在250 mA/cm2下碱性水电解时过电位降低达37 mV，且该镀层电极在碱性介质下具有较高的析氢活性和耐腐蚀性能，在100 h水电解实验中表现出较强的稳定性。
关键字: 氧化镨；氧化铒；Ni-S合金；电沉积；析氢反应
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Ni-S coating electrodes were prepared on the foam nickel substrates by electrodeposition method with Pr2O3 or Er2O3 as additives. The effects of the rare earth compounds on the grain sizes, textures, microstructures and electrochemical activities of Ni-S coatings were studied. The results show that the rare earth oxides added in electrolyte can increase the cathode polarization. The Ni-S coatings with additives have larger surface area and smaller grain sizes. The hydrogen evolution overpotential of Ni-S(Pr2O3) alloy coatings decreases, it exhibits higher hydrogen evolution activities and better corrosion resistant performance in alkaline water. The hydrogen evolution overpotential of Ni-S(Pr2O3) coatings electrolyzed at 250 mA/cm2 is 37 mV lower than that of the Ni-S coatings without additives. Most importantly, Ni-S(Pr2O3) coating exhibits high electrochemical stability for 100 h electrolysis.
Key words: Pr2O3; Er2O3; Ni-S alloy; electrodeposition; hydrogen evolution reaction
