摘要
用化学共沉淀法制备掺杂La的Ni(OH)2。通过X射线衍射和红外光谱对掺杂La的Ni(OH)2进行结构表征,并采用模拟电池和循环伏安法对其电化学性能进行研究。研究结果表明掺杂La的Ni(OH)2具有与α-Ni(OH)2相似的晶体结构,具有较大的层间距,有利于质子的迁移,其分子中的OH-不再处于自由构型状态,它与晶格中的水分子发生相互作用,比未掺杂的Ni(OH)2在晶格层间具有更多的水分子。当掺杂La的摩尔分数为6.32%时,掺杂La的Ni(OH)2的放电曲线比较平坦,具有较高的放电平台、较高的还原电位和析氧电位,且循环可逆性较好。
Lanthanum doping nickel hydroxide samples were prepared by chemical co-precipitation method. The structure characteristics of the lanthanum doping nickel hydroxide were analyzed by X-ray diffraction and infrared spectrum. The electrochemical performances of the lanthanum doping nickel hydroxide were studied by means of laboratory cell and cyclic voltammetry. The results show that the structure of the lanthanum doping nickel hydroxide is similar to that of α- nickel hydroxide, and it has a large interlayer distance, which is helpful for the diffusion of protoni OH- group in lanthanum doping nickel hydroxide is no longer at free structure phase, which interact with the molecule of water in the lattice. When the mole fraction of lanthanum doping is 6.32%, lanthanum doping nickel hydroxide has flat discharge curve, higher discharge plateau, higher deoxidation potential, higher oxygen evolution potential, and good cyclic reversibility.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第6期988-993,共6页
Journal of Central South University:Science and Technology
基金
国家"863"计划项目(2001AA501433)
