电沉积纳米晶体电催化电极的制备及性能

Preparation of nanocrystalline electrocatalystic electrode for electrodeposition

利用恒电流电沉积的方法从含有糖精,温度为50～60℃,pH<3的瓦特槽中用直流和脉冲的方式制备纳米晶体镍、镍 钴合金电催化析氢电极.X衍射、扫描电镜(SEM)和能谱(EDS)分析结果表明:此类金属(Ni)或合金(Ni Co)表现出很强的(111)织构;该晶体为纳米晶体,其中含有少量硫;由电沉积纳米晶体制备成的电极在1mol·L-1硫酸中比常规的金属Ni或电沉积粗晶镍有较强的电催化活性、稳定性和耐蚀性.

Galvanostatic deposition is used to electrodeposit nickel and nickelcobalt alloy from a Watts bath containing saccharin at 50～60 ℃, pH<3.5 and at the current density i>5 A·dm-2 in D. C. or pulse plating conditions. When comparing intensities of the nickel and nickelcobalt alloy deposits with the traditional nickel deposit,it can be concluded that the deposits have strong (111) fibre texture by XRD analysis. The results of the X ray and SEM and EDS(energy dispersive spectroscope) analysis show that the crystal of nickel and nickelcobalt alloy deposits are nanocrystalline whose grain size is less than 100 nm and whose deposits are found to contain a little sulphur impurity. The electrodes made by electrodeposited nickel or nickelcobalt alloy can electrocatalyse hydrogen evolution in 1 mol·L-1 H2SO4. They also show good stability and anticorrosion in these solutions.