Influence of the MnO2 Phase on Oxygen Evolution Reaction Performance for Low‐Loading Iridium Electrocatalysts. Issue 2 (28th January 2021)

• Record Type: Journal Article
• Authors: Wang, Zheyuan; Gao, Wenluan; Xu, Qingli; Ren, Xiaona; Xu, Shuang; Zhu, Shuaikang; Niu, Xiaopo; Li, Xiaoxue; Zhao, Rong; Han, Yunxi; Li, Guozhu; Wang, Qingfa
• Is Part Of: ChemElectroChem. Volume 8:Issue 2(2021)
• Page Start: 418
• Page End: 424
• Publication Date: 2021-01-28
• Subjects: oxygen evolution reaction -- iridium-based catalysis -- MnO2 -- phase states -- electrocatalysis; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202001513
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Developing high‐performance, low‐loading, Ir‐based electrocatalysts for the oxygen evolution reaction (OER) in acidic media is still a great challenge. Herein, we fabricated an iridium manganese catalyst with only 5 % iridium. The influence of the manganese dioxide phase states (α‐, β‐, γ‐ and δ‐MnO2 ) on the OER performance of IrO2 /MnO2 catalysts was investigated. α‐MnO2, as the substrate, can generate smaller iridium particles and more high‐valence‐state iridium to promote OER performance. Therefore, the 5 % IrO2 /α‐MnO2 electrocatalyst exhibits excellent electrocatalytic OER performance with a high mass activity of 216.67 A/gIr and 655.33 A/gIr at 1.53 V in acidic and alkaline media, respectively, significantly outperforming commercial IrO2 . Abstract : Best of the bunch: Four different phases of IrO2 /MnO2 are synthesized by using a simple reduction‐oxidation method, which can improve oxygen evolution reaction (OER) performance. IrO2 /α‐MnO2 shows the best OER performance among the four different IrO2 /MnO2 catalysts.