Ultrasmall IrO2 nanoparticles anchored on hollow Co-Mo multi-oxide heterostructure nanocages for efficient oxygen evolution in acid

被引:18
|
作者
Han, Weiwei [1 ]
Qian, Yang [1 ]
Zhang, Fan [1 ]
He, Yi [1 ,2 ]
Li, Ping [1 ,2 ]
Zhang, Xingwang [1 ,2 ]
机构
[1] Zhejiang Univ, Coll Chem & Biol Engn, Key Lab Biomass Chem Engn, Minist Educ, Hangzhou 310058, Zhejiang, Peoples R China
[2] Inst Zhejiang Univ, Quzhou 324000, Zhejiang, Peoples R China
关键词
Acidic OER; IrO2; Transition metal oxides; Metal organic framework; Heterostructure; Theoretical calculations; INITIO MOLECULAR-DYNAMICS; TOTAL-ENERGY CALCULATIONS; ELECTROCATALYSTS;
D O I
10.1016/j.cej.2023.145353
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The application of proton exchange membrane water electrolysis (PEMWE) is largely limited by the sluggish oxygen evolution reaction (OER) kinetics, which usually requires noble metal Ir/Ru-based catalysts. It's desirable to design low-cost catalysts with less content of Ir/Ru in OER without sacrificing their catalytic performance. Herein, the ultrasmall IrO2 nanoparticles uniformly dispersed on Co3O4-CoMoO4 nanocages (IrO2@Co3O4- CoMoO4) electrocatalyst is demonstrated. Structural characterization indicates that hollow Co3O4-CoMoO4 acts as the effective support to provide abundant anchoring sites and heterogenous interfaces, which enable the catalyst to expose more active sites and accelerate charge transport. As a result, the representative IrO2@Co3O4- CoMoO4 exhibits an outstanding OER activity (eta = 236 mV at 10 mA cm-2) with a superior mass activity of 713 A g-1 Ir at 1.53 V vs. RHE in 0.5 M H2SO4 that are comparable to most reported catalysts. Theoretical calculations also reveal that the introduction of Mo can effectively modify electronic structure and decrease adsorption en-ergy barriers of oxygen intermediates, and thereby enhancing OER catalytic activity. This work provides a new idea to develop highly efficient low Ir catalysts for OER.
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页数:9
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