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采用石墨烯(GO)掺杂,以KMnO_4作为苯胺单体聚合引发剂,直接反应合成GO/PANI/MnO_2三元复合催化颗粒,优化MnO_2氧还原反应(ORR)催化性能。采用XRD、FE-SEM研究其颗粒特性和表面形貌,极化曲线、循环伏安、交流阻抗法研究空气电极氧化还原反应过程。结果表明,该复合催化颗粒具有粒度小、比表面积高等特性,空气电极极化和阻抗特性随复合催化颗粒含量不同而变化,GO/PANI/MnO_2在催化剂中占75%时呈现优良催化效果及循环稳定性。含复合催化颗粒的空气电极比单一MnO_2催化颗粒的电极可提升放电平台电压近0.1 V,放电时间延长近100%。所获结果可为复合电化学催化剂组成设计与性能优化提供新数据和技术应用方案。
The GO / PANI / MnO 2 ternary composite catalyst particles were synthesized by direct graphene (GO) doping and KMnO 4 as aniline monomer polymerization initiator to optimize the catalytic performance of MnO 2 oxygen reduction reaction (ORR). The particle characteristics, surface morphology, polarization curve, cyclic voltammetry and AC impedance were used to study the redox reaction of air electrode by XRD and FE-SEM. The results showed that the composite catalyst particles had the characteristics of small particle size and high specific surface area. The polarization and impedance characteristics of the air electrode varied with the content of the composite catalyst particles. GO / PANI / MnO 2 showed excellent catalytic activity when the catalyst accounted for 75% stability. The air electrode with composite catalytic particles can raise the discharge plateau voltage by nearly 0.1 V and discharge time by nearly 100% compared with the single MnO 2 catalytic particle electrode. The results obtained for composite electrochemical catalyst composition design and performance optimization provide new data and technology applications.