Issue 36, 2024

Piezoelectric MoS2 with expanded interlayers: a flexible anode for a “zero” interfacial quasi-solid-state ammonium-ion asymmetric supercapacitor

Abstract

Ammonium ion (NH4+) supercapacitors are gaining significant interest because they are less expensive, safer, and more environmentally friendly compared with metal ion supercapacitors. However, the development of ideal electrode materials for high-efficiency NH4+ storage that have fast diffusion kinetics is still falling short of expectations. Herein, we propose 1T/2H phase MoS2 nanosheets with expanded interlayers grown on carbon cloth (Exp-MoS2/CC) as a promising flexible anode for NH4+ asymmetric supercapacitors. In terms of its huge space for NH4+ storage, Exp-MoS2/CC delivers a specific capacitance reaching up to 2003.8 mF cm−2 at 1 mA cm−2 and exhibits 90.3% capacitance retention after 5000 cycles. Experimental results and theoretical calculations reveal the unique piezoelectric effect of Exp-MoS2/CC, which functions as an extra accelerator to significantly promote NH4+ transfer and leads to a faster NH4+ diffusion rate relative to that of contrastive T-MoS2/CC and MoS2/CC. Moreover, a flexible quasi-solid-state supercapacitor with a “zero” interface was successfully assembled by integrating with an Exp-MoS2/CC anode and MnO2/CC cathode, achieving a specific capacitance of 497.6 mF cm−2 and an energy density of 223.7 mW h cm−2. Overall, this work holds significant promise for designing new-fashioned NH4+ insertion electrodes with a unique nanostructure configuration and remarkable electrochemical performance.

Graphical abstract: Piezoelectric MoS2 with expanded interlayers: a flexible anode for a “zero” interfacial quasi-solid-state ammonium-ion asymmetric supercapacitor

Supplementary files

Article information

Article type
Communication
Submitted
06 7 2024
Accepted
16 8 2024
First published
20 8 2024

J. Mater. Chem. A, 2024,12, 24084-24090

Piezoelectric MoS2 with expanded interlayers: a flexible anode for a “zero” interfacial quasi-solid-state ammonium-ion asymmetric supercapacitor

Z. Li, W. Zhao, Q. Zhang, Q. Zhou, J. Liang, Z. Cai, M. Zhang, C. Yang, S. Sun, Y. Luo, D. Zheng, F. Gong, Y. Yao, Y. Lin and X. Sun, J. Mater. Chem. A, 2024, 12, 24084 DOI: 10.1039/D4TA04691A

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