2.4 V ultrahigh-voltage aqueous MXene-based asymmetric micro-supercapacitors with high volumetric energy density toward a self-sufficient integrated microsystem

Yuanyuan Zhu ¹Shuanghao Zheng ²Jieqiong Qin ³Jiaxin Ma ⁴Pratteek Das ⁴Feng Zhou ⁵Zhong-Shuai Wu²

扫码查看

作者信息

1. State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes,Suzhou University,Suzhou 234000,China
2. State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;Dalian National Laboratory for Clean Energy,Chinese Academy of Sciences,Dalian 116023,China
3. College of Science,Henan Agricultural University,Zhengzhou 450002,China
4. State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;University of Chinese Academy of Sciences,Shijingshan District,Beijing 100049,China
5. State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China
折叠

Abstract

Two-dimensional MXenes are key high-capacitance electrode materials for micro-supercapacitors(MSCs)cater-ing to integrated microsystems.However,the narrow electrochemical voltage windows of conventional aqueous electrolytes(≤ 1.23 V)and symmetric MXene MSCs(typically ≤ 0.6 V)substantially limit their output voltage and energy density.Highly concentrated aqueous electrolytes exhibit lower water molecule activity,which in-hibits water splitting and consequently widens the operating voltage window.Herein,we report ultrahigh-voltage aqueous planar asymmetric MSCs(AMSCs)based on a highly concentrated LiCl-gel quasi-solid-state electrolyte with MXene(Ti3C2Tx)as the negative electrode and MnO2 nanosheets as the positive electrode(MXene//MnO2-AMSCs).The MXene//MnO2-AMSCs exhibit a high voltage of up to 2.4 V,attaining an ultrahigh volumetric energy density of 53 mWh cm-3.Furthermore,the in-plane geometry and the quasi-solid-state electrolyte en-abled excellent mechanical flexibility and performance uniformity in the serially/parallel connected packs of our AMSCs.Notably,the MXene//MnO2-AMSC-based integrated microsystem,in conjunction with solar cells and consumer electronics,could efficiently realize simultaneous energy harvesting,storage,and conversion.The findings of this study provide insights for constructing high-voltage aqueous MXene-based AMSCs as safe and self-sufficient micropower sources in smart integrated microsystems.

Key words

Asymmetric micro-supercapacitors/MXene/MnO2/Aqueous electrolyte/High voltage/Integrated microsystem

引用本文复制引用

基金项目

国家自然科学基金(22005297)

国家自然科学基金(22125903)

国家自然科学基金(51872283)

the"Transformational Technologies for Clean Energy and Demonstration"Strategic Priority Research Program of the Chinese Academy (XDA21000000)

Dalian Innovation Support Plan for High Level Talents(2019RT09)

Dalian National Laboratory for Clean Energy(DNL)()

Chinese Academy of Sciences(CAS)()

DNL Cooperation Fund,CAS(DNL201912)

DNL Cooperation Fund,CAS(DNL201915)

DNL Cooperation Fund,CAS(DNL202016)

DNL Cooperation Fund,CAS(DNL202019)

DICP(DICP ZZBS201802)

DICP(DICP I2020032)

Joint Fund of the Yulin University()

Dalian National Laboratory for Clean Energy(YLU-DNL Fund 2021002)

Dalian National Laboratory for Clean Energy(YLU-DNL Fund 2021009)

中国博士后科学基金(2020M680995)

出版年

2024

自然科学基础研究(英文)

CSTPCD

ISSN：

参考文献量50

段落导航