碳包覆Fe-P氧还原催化剂的制备及性能研究

Preparation and Performance Investigation of Carbon-Encapsulated Fe-P Electrocatalyst for Oxygen Reduction Reaction

以ZIF-8为碳源,通过高温热解的方法,制备了一种非贵金属氧还原反应(ORR)催化剂—碳包覆的Fe-P复合材料(Fe-P@CMF).实验结果表明,当烧结温度为1100℃时,复合材料Fe-P@CMF-1100的ORR性能最佳,在O 2饱和的0.1 M KOH中,其起始电位达到了0.94 V,半波电位达到了0.85 V.K-L曲线的结果表明,复合材料Fe-P@CMF-1100催化ORR遵循四电子转移机理.此外,Fe-P@CMF-1100比Pt/C具有更高的电催化稳定性,在经历10 h的稳定性测试之后,电流密度依然保持了初始值的89.4%;同时,该复合材料比Pt/C具有更好的甲醇耐受性.本研究为废弃磷铁资源的二次利用开辟了新途径,对于提高能源的转化效率和实现环境资源的可持续发展有着重要的意义.

A nonprecious ORR electrocatalyst of carbon encapsulated Fe-P composite(Fe-P@CMF)was synthesized by a high-temperature pyrolysis method by using ZIF-8 as carbon source.The experiment results show that the composite of Fe-P@CMF-1100 possesses optimum ORR performance when the sintering temperature reaches 1100℃with a preferable onset potential of 0.94 V and a high half-wave potential of 0.85 V in O 2 saturated 0.1 M KOH.The result of K-L plot manifests that the Fe-P@CMF-1100 triggers four electronic transfer mechanism during the process of ORR.In addition,Fe-P@CMF-1100 has higher catalytic stability than that of Pt/C with current density retention of 89.4%after 10 h stability test.At the same time,Fe-P@CMF-1100 has remarkable methanol tolerance.This research results have opened a new way for the reutilization of industrial waste Fe-P,which is of great significance to improve the efficiency of energy conversion and realize the sustainable development of environmental resources.