MnO_(2)-0.39IrO_(x)复合氧化物用于酸性介质中水氧化反应的性能  

Performance of MnO_(2)-0.39IrOx composite oxides forwater oxidation reaction in acidic media

作　　者：郭川铭 张凯杨 武昀 姚瑞 赵强 李晋平 刘光 GUO Chuanming;ZHANG Kaiyang;WU Yun;YAO Rui;ZHAO Qiang;LI Jinping;LIU Guang(Shanxi Key Laboratory of Gas Energy Efficient&Clean Utilization,College of Chemical Engineering&Technology,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学化学工程与技术学院,气体能源高效清洁利用山西省重点实验室,太原030024

出　　处：《无机化学学报》2024年第6期1135-1142,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.22075196,U22A20418);山西美锦氢能开发有限公司技术开发项目(No.NZ-H20220665)资助。

摘　　要：通过Adams方法成功制备MnO_(2)-0.39IrO_(x)(0.39为Ir/Mn的原子比)催化剂并将其用于酸性介质中高效析氧反应(OER)。电化学测试发现,MnO_(2)-0.39IrO_(x)仅需253 mV的过电势即可驱动10 mA·cm^(-2)的水氧化电流密度,并可稳定运行200 h。在1.50 V(vs RHE)电势下,MnO_(2)-0.39IrO_(x)的贵金属Ir的质量活性为61.3 mA·mg^(-1),是IrO2的35.8倍,说明MnO_(2)掺杂大大提升了贵金属利用率。结构分析发现MnO_(2)-0.39IrO_(x)独特的片状结构大幅度提高了催化剂的电化学活性表面积,并且Ir位点与Mn位点之间存在一定的电子相互作用。催化过程分析表明,MnO_(2)-0.39IrO_(x)表面出现一定的重构现象,并且Mn组分对Ir位点的化学环境实现了持续优化,从而实现了催化剂的高效酸性OER性能。MnO_(2)-0.39IrO_(x)(0.39 was the atomic ratio of Ir/Mn)catalysts were successfully prepared by the Adams method and applied for efficient oxygen precipitation reaction(OER)in an acidic medium.During the electrochemi-cal measurement,MnO_(2)-0.39IrO_(x)enabled the water oxidation process to reach a current density of 10 mA·cm^(-2)with an overpotential of only 253 mV and maintained a stable test for more than 200 h.In addition,the noble metal Ir mass activity of MnO_(2)-0.39IrO_(x)was 61.3 mA·mg^(-1)at a potential of 1.50 V(vs RHE),which was 35.8 times higher than that of IrO2,increasing the precious metal utilization.Structural analysis revealed that the unique lamellar structure of MnO_(2)-0.39IrO_(x)substantially improves the electrochemically active surface of the catalysts and that there are certain electronic interactions between the Ir sites and the Mn sites.The analysis of the catalytic process showed that the MnO_(2)-0.39IrO_(x)surface showed some reconfiguration phenomenon and the Mn components achieved a continuous optimization of the chemical environment of the Ir sites,which led to the efficient acidic OER perfor-mance of the catalyst.

关 键 词：析氧反应 Ir基催化剂 双金属氧化物 相互作用 利用率 

分 类 号：O614.825[理学—无机化学] TQ151.1[理学—化学] O614.711[化学工程—电化学工业]