Excess Activity Tuned by Distorted Tetrahedron in CoMoO4 for Oxygen Evolution

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外文摘要：Oxygen vacancies enable modulating surface reconstruction of transition metal oxides containing metal-oxygen polyhedrons into metallic oxyhydroxide for oxygen evolution reaction(OER),while revealing reconstructing mechanism is stuck by the requirement to precisely control exact sites of these vacancies.Herein,oxygen vacancies are localized only within MoO4 tetrahedrons rather than CoO6 octahedrons in CoMoO4 catalyst,guaranteeing coherent reconstruction of CoO6 octahedrons into pure CoOOH with tunable activities for OER.Meanwhile,distorted tetrahedron accelerates the dissolution of Mo atoms into alkaline electrolyte,triggering spontaneous transition of partial CoMoO4 into Co(OH)2.CoO6 octahedrons in both CoMoO4 and Co(OH)2 can transform pure CoOOH completely at lower potential,resulting in excess intrinsic activity whose summit is identified by overpotential at 10 mA cm-2 with 22.9％reduction and Tafel slope with 65.3％reduction.Well-defined manipulation over the distorted polyhedrons offers one versatile knob to precisely modulate electronic structure of oxide catalysts with outstanding OER performance.

外文关键词：

metal-oxygen polyhedronoxygen evolution reactionoxygen vacancyRaman spectroscopy

作者：

Hengbo Xiao、Kai Chi、Hongxia Yin、Xiangji Zhou、Pengxiang Lei、Peizhi Liu、Jiakun Fang、Xiuhong Li、Songliu Yuan、Zhen Zhang、Yaqiong Su、Junjie Guo、Lihua Qian

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作者单位：

School of Physics,Huazhong University of Science and Technology,Wuhan,430074,China

Key Laboratory of Material Chemistry for Energy Conversion and Storage,School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

School of Chemistry and Chemical Engineering,Hubei University of Technology,Wuhan 430068,China

Key Laboratory of Interface Science and Engineering in Advanced Materials(Ministry of Education),Taiyuan University of Technology,Taiyuan 030024,China

State Key Lab of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

School of Mechanical Engineering,Hubei University of Technology,Wuhan 430068,China

Department of Stomatology,Union Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan 430074,China

School of Chemistry,Xi'an Jiaotong University,Xi'an 710049,China

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出版年：

2024

DOI：

10.1002/eem2.12495

能源与环境材料(英文)

ISSN：

年,卷(期)：2024.7(1)