MnO2 as bifunctional oxygen electrocatalyst with pseudocapacitive behavior for high-power rechargeable seawater batteries

IF 8.9 2区 工程技术 Q1 ENERGY & FUELS
Seohae Kim , Dowan Kim , Youngsik Kim , Jehee Park
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Abstract

Seawater batteries (SWBs) represent a promising energy storage solution because they use abundant, low-cost Na ions from seawater. However, the power performance of SWBs is limited by the sluggish kinetics of the oxygen evolution and reduction reactions (OER/ORR) at seawater cathodes. In the present study, to address these limitations, we explored the use of manganese dioxide (MnO2) as a bifunctional electrocatalyst with pseudocapacitive behavior to enhance OER/ORR catalytic activity and power performance. MnO2 nanoparticles were synthesized via a straightforward precipitation method, resulting in a material with an amorphous structure, which is conducive to improved capacitive performance. Electrochemical characterization revealed that the SWBs with MnO2 exhibited significantly enhanced power output and cycling stability relative to the cell without the catalyst. These improvements are attributed to the hybridized effects of pseudocapacitance and catalytic activity, which accelerate charge storage and release. Our findings suggest that MnO2 is a promising material for enhancing the performance of SWBs, paving the way for developing next-generation energy storage systems with superior efficiency and stability.

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来源期刊
Journal of energy storage
Journal of energy storage Energy-Renewable Energy, Sustainability and the Environment
CiteScore
11.80
自引率
24.50%
发文量
2262
审稿时长
69 days
期刊介绍: Journal of energy storage focusses on all aspects of energy storage, in particular systems integration, electric grid integration, modelling and analysis, novel energy storage technologies, sizing and management strategies, business models for operation of storage systems and energy storage developments worldwide.
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