Balancing loading mass and gravimetric capacitance of NiCo−layered double hydroxides to achieve ultrahigh areal performance for flexible supercapacitors

Jie Zhao; Cao Zhou; Yue Guo; Zhen Shen; Geng Luo; Qiang Wu; Lijun Yang; Xizhang Wang; Zheng Hu

Advanced Powder Materials (Feb 2024)

Balancing loading mass and gravimetric capacitance of NiCo−layered double hydroxides to achieve ultrahigh areal performance for flexible supercapacitors

Jie Zhao,
Cao Zhou,
Yue Guo,
Zhen Shen,
Geng Luo,
Qiang Wu,
Lijun Yang,
Xizhang Wang,
Zheng Hu

Affiliations

Jie Zhao: Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Provincial Laboratory for Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China; Institute for Advanced Studies, Shenzhen University, Shenzhen 518060, China
Cao Zhou: Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Provincial Laboratory for Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
Yue Guo: Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Provincial Laboratory for Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
Zhen Shen: Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Provincial Laboratory for Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
Geng Luo: Institute for Advanced Studies, Shenzhen University, Shenzhen 518060, China
Qiang Wu: Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Provincial Laboratory for Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China; Corresponding author.
Lijun Yang: Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Provincial Laboratory for Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China; Corresponding author.
Xizhang Wang: Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Provincial Laboratory for Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
Zheng Hu: Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Provincial Laboratory for Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China; Corresponding author.

Journal volume & issue: Vol. 3, no. 1
p. 100151

Abstract

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Delivering high areal capacitance (CA) at high rates is crucial but challenging for flexible supercapacitors. CA is the product of areal loading mass (MA) and gravimetric capacitance (CW). Finding and understanding the balance between MA and CW of supercapacitor materials is significant for designing high-CA electrodes. Herein, we have systematically studied the correlation between MA and CW of the nanosheet arrays of NiCo−layered double hydroxide (NiCo−LDH), which were electrodeposited on carbon cloth with different heights to adjust the MA, accompanied by the interlayer distance regulation to improve the CW. The optimal CW performance is achieved at the best charge transfer kinetics for each of MA series. The NiCo−LDH electrode with the suitable MA (2.58 mg cm−2) and the relatively high CW (1918 F g−1 at 5 A g−1 and 400 F g−1 at 150 A g−1) present a high CA of 4948 mF cm−2 at 12.9 mA cm−2 and a record-high 1032 mF cm−2 among LDHs-based flexible electrodes at an ultrahigh current density of 387 mA cm−2. The corresponding flexible supercapacitor coupled with activated carbon delivers a high energy density of 0.28 mWh cm−2 at an ultrahigh power density of 712 mW cm−2, showing great potential applications.

Published in Advanced Powder Materials

ISSN: 2772-834X (Online)
Publisher: KeAi Communications Co. Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/advanced-powder-materials/

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