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Tailoring Oxygen Vacancy on Co3O4 Nanosheets with High Surface Area for Oxygen Evolution Reaction
Gong Zhang1,2, Jing-hong Li1
1.Department of Chemistry, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Tsinghua University, Beijing 100084, China;2.Center for Water and Ecology, Tsinghua University, Beijing 100084, China
Abstract:
Electrochemical water splitting requires efficient water oxidation catalysts to accelerate the sluggish kinetics of water oxidation reaction. Here, we designed an efficient Co3O4 electrocatalyst using a pyrolysis strategy for oxygen evolution reaction (OER). Morphological characterization confirmed the ultra-thin structure of nanosheet. Further, the existence of oxygen vacancies was obviously evidenced by the X-ray photoelectron spectroscopy and electron spin resonance spectroscopy. The increased surface area of Co3O4 ensures more exposed sites, whereas generated oxygen vacancies on Co3O4 surface create more active defects. The two scenarios were beneficial for accelerating the OER across the interface between the anode and electrolyte. As expected, the optimized Co3O4 nanosheets can catalyze the OER efficiently with a low overpotential of 310 mV at current density of 10 mA/cm2 and remarkable long-term stability in 1.0 mol/L KOH.
Key words:  Electrocatalyst  OER  Oxygen vacancy  Co3O4
FundProject:This work was supported by the National Natural Science Foundation of China (No.21621003, No.21327806), National Key Research and Development Program of China (No.2016YFA0203101) and Tsinghua University Initiative Scientific Research Program.
附件
调控氧空位实现高比表面积Co3O4纳米片上的产氧反应
张弓1,2, 李景虹1
1.清华大学化学系, 生命有机磷化学及化学生物学教育部重点实验室, 北京 100084;2.清华大学水质与水生态研究中心, 北京 100084
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DOI:10.1063/1674-0068/31/cjcp1805127
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