Deep eutectic solvent-infused two-dimensional metal-organic framework membranes as quasi-solid-state electrolytes for wearable micro-supercapacitors

Xiaoyu Wang; Yuqi Wang; Yuan Kang; Bing Yao; Xinsheng Peng

doi:10.1039/d3nr03464j

Deep eutectic solvent-infused two-dimensional metal-organic framework membranes as quasi-solid-state electrolytes for wearable micro-supercapacitors

Nanoscale. 2023 Oct 5;15(38):15626-15634. doi: 10.1039/d3nr03464j.

Authors

Xiaoyu Wang^{1

2}, Yuqi Wang^{1

2}, Yuan Kang³, Bing Yao^{1

2}, Xinsheng Peng^{1

2}

Affiliations

¹ State Key Laboratory of Silicon Materials and Advanced Semiconductor Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. pengxinsheng@zju.edu.cn.
² Wenzhou Key Laboratory of Novel Optoelectronic and Nanomaterials, Institute of Wenzhou, Zhejiang University, Wenzhou 325006, China.
³ Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia.

PMID: 37721154
DOI: 10.1039/d3nr03464j

Abstract

The burgeoning field of miniaturized and portable electronic devices calls for novel advances in micro-energy storage technology. Micro-supercapacitors (MSC) stand at the forefront of this endeavour, yet unlocking their full potential necessitates the exploration of high-performance electrolytes. Herein, we introduce a strategy that leverages flexible metal-organic framework (MOF, CuTCPP) nanosheet-based membranes to construct quasi-solid-state electrolytes (QSSEs) and enhance the ionic conductivity and electrochemical performance of deep eutectic solvent (DES)-based MSCs. Owing to the multiple nanochannel pathways provided by the porous MOF nanosheets, the ionic conductivity of DES within the nanochannels exhibits a 13-fold increment compared with its bulk counterpart. Furthermore, we engineered MSC harnessing the CuTCPP-DES system, whose performance surpasses that reported for most of the ionic liquid and 2D material-based MSCs. The areal-specific capacitance was 81.3 mF cm^-2 at a current density of 0.1 mA cm^-2, and the energy density was 45.17 μW h cm^-2 at a power density of 8.559 mW cm^-2. Notably, the performance of MSCs remains consistent and unaffected, even when subjected to bending. These findings contribute to the exploration and potential optimization of the inherent benefits of MOFs, thereby presenting a paradigm shift in nanoconfined systems for microscale energy storage applications.