(中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 以氧化鐠、氧化鉺為添加劑，在泡沫鎳基體上電沉積制備Ni-S鍍層電極。對鍍層的表面形貌、鍍層結(jié)構(gòu)、電沉積行為及鍍層的電化學性能進行研究。結(jié)果表明：電鍍液中添加稀土氧化物后電沉積過程的陰極極化增強，沉積層晶粒細化，比表面積增大，因而電極的析氫過電位降低；其中，添加Pr2O3的Ni-S鍍層在250 mA/cm2下堿性水電解時過電位降低達37 mV，且該鍍層電極在堿性介質(zhì)下具有較高的析氫活性和耐腐蝕性能，在100 h水電解實驗中表現(xiàn)出較強的穩(wěn)定性。
關(guān)鍵字: 氧化鐠；氧化鉺；Ni-S合金；電沉積；析氫反應(yīng)
（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
