摘要
在贱金属铁基上表面化学镀Ni Co P ,然后通过化学复合镀制得Ni Co P Al2 O3中间层 ,复合镀层用 5mol·L- 1NaOH溶液浸出 ,可制得新型Ni Co P微孔活性中间层 ,在中间层上再涂覆匹配性较好的NiCo2 O4表面活性层 ,该活性层是由一定Ni(NO3) 2 和Co(NO3) 2 的量配比通过高温热解而成 .为考察该电极在碱性溶液的析氧反应机理 ,通过恒电位阶跃实验I~t曲线求出了不同时间下的电量Q ,由Q对t1 / 2 作图得Q t1 / 2 曲线 .结果证明 ,Q t1 / 2 曲线为不通过坐标原点的直线 ,说明该析氧电极反应为典型的不可逆反应 .通过对析氧电极反应假想模型进行动力学推算及实验 ,初步确定了电极反应的速度控制步骤 .
A Ni Co P Al 2O 3 composite coating was electrolessly plated after Ni Co P coating on Fe matrix. Then composite coating was immersed in 5 mol/L NaOH solution to obtain an active Ni Co P coating (middle coating) with microholes,on which an active surface coating of NiCo 2O 4 was pyrolysisly formed by dipping in 2.0 mol/L Ni(NO 3) 2, Co(NO 3) 2 several times. The electric charge( Q ) was measured by I t curves obtained through potentiostatic step at different time, Q t 1/2 curve was a straight line not through the origin dot, demonstrating oxygen evolution reaction was typically irreversible. The step of rate controlling of the electrode reaction in different current density was determined according to the electrode reaction dynamics and experiment results. [
出处
《中南工业大学学报》
CSCD
北大核心
2000年第4期303-306,共4页
Journal of Central South University of Technology(Natural Science)
基金
国家教育部优秀年轻教师基金资助项目! ( 1 998 1 2 )