Refined construction of heterophase boundary on CoCO3@Cobalt boride nanocomplexes for supercapacitor and electrocatalysis

Jing-Feng Hou, Jian-Fei Gao and Ling-Bin Kong

Renewable Energy, 2024, vol. 237, issue PB

Abstract: Heterostructures comprising crystalline cores and amorphous shells are pervasively utilized in electrochemical storage and conversion due to their distinctive physical and chemical attributes. In this study, we present a novel CoCO3@Co-B nanocomposite as a tri-functional electrode for supercapacitors and alkaline water electrolysis. The material is produced via a straightforward hydrothermal process, followed by an in-situ growth treatment. The core-shell structure of crystalline CoCO₃-amorphous Co-B exhibits remarkable specific capacitance and commendable hydrogen and oxygen evolution performance. The optimized CoCO3@Co-B electrode exhibits remarkable specific capacitance (352 F g−1 @ 0.5 A g−1) and superior cycling stability (78 % @ 5 A g−1 after 10,000 cycles). Additionally, the CoCO3@Co-B//activated carbon hybrid supercapacitor device exhibits a considerable specific capacitance (42.1 F g−1 @ 0.5 A g−1). The CoCO3@Co-B electrode displays excellent OER/HER performance, with Tafel slopes of 82.6 and 116 mV dec−1, respectively, which are superior to the original CoCO3 values. This kind of active material exhibits a crystalline-amorphous contact, which reduces the energy barrier of electrochemical reactions and forms a built-in electric field, thereby increasing the number of active sites and enhancing electron transmission. As an advanced electrode material, CoCO3@Co-B holds immense potential for future development and research.

Keywords: Crystalline-amorphous interfaces; Supercapacitors; Oxygen evolution reaction; Hydrogen ovolution reaction (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:237:y:2024:i:pb:s0960148124018305

DOI: 10.1016/j.renene.2024.121762

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