摘要
利用高分子导电聚合物的聚合反应对镁系贮氢合金Mg1.8Nd0.2Ni进行表面处理,采用SEM对合金颗粒表面的微观结构进行观察,合金表面形成了一层聚苯胺导电高分子包覆层。研究了不同表面处理时间和处理方式对合金电化学性能的影响,实验表明表面处理能提高材料的抗氧化、抗腐蚀性能,改善电极电化学反应性能延长电极的使用寿命。表面处理提高了合金的活化性能与循环稳定性,容量保持率从77.82%提高到86.31%。EIS图表明包覆层增加了电极表面电荷转移阻抗。Tafel极化曲线中腐蚀电位明显右移,抗腐蚀性能提高,导电高分子层的网状结构加速了氢原子的传导并且阻止了合金表面氧的渗透。另外通过动电位极化曲线发现,表面处理工艺使合金的内部缺陷得到了优化,氢在体相内的扩散速率明显增加。
Conductive polymer polymerization reaction surface treatment was used for Mg1.8Nd0.2Ni hydrogen storage alloy. SEM was analyzed by microstructure particles on the surface, alloy surface was coated polyaniline conductive polymer layer. The effect of different surface treatment time and treatment mode on the electrochemical properties of the alloys was studied. Experiments show that surface treatment improves the performance of corrosion resistance and oxidation resistance. Improved electrode electrochemical reaction could prolong the electrode service life.Surface treatment could improved activation performance and cycling stability. The capacity retention rate increased from 77.82% to 86.31%. From EIS, the layer increased electrode charge surface transfer impedance. Tafel polarization curves were moved right, corrosion resistant performance was improved significantly. Structure of conductive polymer layer, accelerated the hydrogen atoms and prevent infiltration of oxygen. By potentiodynamic polarization curve we found that the internal defects of alloy was optimized, the rate of hydrogen diffusion in the bulk phase was obviously increased.
出处
《电源技术》
CAS
CSCD
北大核心
2016年第3期558-560,593,共4页
Chinese Journal of Power Sources
基金
内蒙古自然科学基金(2013MS0722)
关键词
贮氢合金
表面处理
聚苯胺
电化学性能
hydrogen storage alloy
surface treatment
polyaniline
electrochemical properties
