钙钛矿型复合氧化物CaVO_3的制备及对氧还原反应的电催化性能

Preparation and Electrocatalytic Properties of Perovskite Type Oxides CaVO_3 for Oxygen Reduction Reaction

以五氧化二钒、硝酸钙、柠檬酸和草酸为原料,采用溶胶-凝胶法制备出CaVO_3的前驱体,在氩气保护下1 000℃煅烧2 h,成功制备出目标产物CaVO_3.对前驱体和目标产物分别进行了傅里叶变换红外(FTIR)光谱、热重(TG)分析、X射线衍射(XRD)和电导率等表征.在1 mol·L^(-1)的KOH电解质溶液中测试了样品的氧还原反应(ORR)催化性能.结果表明,修饰电极上(ORR)的电子转移数是1.5-1.7,发生的是2电子还原.

The precursor powder of CaVO3 was prepared by sol-gel method using vanadium pentoxide, calcium nitrate, citric acid, and oxalic acid as raw materials. The target product CaVO3 was obtained by calcining the precursor powder in argon atmosphere at 1000 ℃. In order to determine the appropriate calcination temperature, thermal stability of the precursor powder was tested. The target product CaVO3 was characterized by Fourier transform infrared （FTIR） spectrometry, thermogravimetry （TG）, X-ray diffraction （XRD）, and conductivity. In addition, the properties for oxygen reduction reaction （ORR） were also investigated, and the results showed that the electron transfer number of ORR on the modified electrode was 1.5-1.7, which indicating that ORR was a two-electron process.