摘要
合成了La2-xSrxNiO4+δ(0≤x≤1)系列类钙钛矿复合氧化物,并将其作为催化层电极材料制备了空气电极.对电极的极化曲线和循环伏安曲线的测定结果表明,La2-xSrxNiO4+δ型类钙钛矿复合氧化物电极材料对氧还原具有较好的催化活性;并且随Sr的掺杂量的不同,材料的催化活性也有所不同.循环伏安和交流阻抗技术对电极反应动力学特征的研究结果表明,电极反应除受电化学步骤控制外,扩散过程也是整个电极过程的控制因素.
A series of perovskite-like complex oxides La2-xSrxNiO4+δ (0≤ x ≤ 1 ), which were used in the oxygen electrode as electrocatalyst, were prepared by means of sol-gel method. In alkaline solution, the electrocatalytic performance of prepared electrodes was evaluated by means of polarization curve, cyclic vohammetry, and electrochemical impedance spectroscopy (EIS) technologies using Hg/HgO as a reference electrode. Experimental results indicate that the perovskite-like materials La2-xSrxNiO4+δ (0 ≤ x ≤ 1 ) have excellent activity as electrocatalyst. Furthermore, the activities are different with the changing of Sr contents in the materials. The EIS technology revealed the electron process to be a mixed control of electrochemistry reaction and diffusion process. The equivalent circuit of the air electrode was proposed and the simulated kinetics data were analyzed
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2009年第5期205-207,共3页
Journal of Harbin Institute of Technology
基金
国家自然科学基金资助项目(20671032
20676027)
关键词
类钙钛矿
氧电极
电催化剂
交流阻抗
perovskite-like complex oxides
oxygen electrode
electrocatalyst