中性体系中钴对镍电极析氧催化性能的影响

为了研究钴镍电极在中性体系中的电催化性能和催化循环稳定性,在金属钛电极上采用电沉积方法制备了不同钴含量的镍涂层电极,通过X射线衍射技术、扫描电镜技术、恒电流极化曲线和循环伏安等测试技术,探讨了不同钴元素的添加量对镍涂层电极在中性体系中析氧电催化活性和循环稳定性的影响.结果表明,添加适量的钴元素细化了镀层晶粒,增大了电极比表面积,提高了电极的析氧催化活性,其中添加40g/L CoSO_4·5H_2O时涂层的晶粒最细,继续增加钴含量颗粒变大但形状多面,比表面积没有减小,对电极析氧催化性能影响不大;同时钴的添加不利于晶体的结晶,降低了电极表面状态的循环稳定性能.

Effect of Co on Oxygen Evolution Electrocatalytic Activity of Ni-Coated Titanium Electrode in a Neutral Medium

Nickel coatings with different Co contentwere prepared on titanium electrode by electrodeposition. Theeffects of Co content on the oxygen evolution eletrocatalytic activi-ty and cycle-stability of Ni-coated Ti electrode in a neutral medi-um were studied by conducting X-rav diffraction analysis andscanning electron microscopic analysis, as well as measurement ofgalvanostatic polarization curves and cyclic voltammograms. Re-sults show that the introduction of a small amount of Co leads todecrease of the grain...