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

作　　者：Yuanyuan Zhu Shuanghao Zheng Jieqiong Qin Jiaxin Ma Pratteek Das Feng Zhou Zhong-Shuai Wu 

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

出　　处：《Fundamental Research》2024年第2期307-314,共8页自然科学基础研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(22005297,22125903,and 51872283);the“Transformational Technologies for Clean Energy and Demonstration”Strategic Priority Research Program of the Chinese Academy of Sciences(XDA21000000);the Dalian Innovation Support Plan for High Level Talents(2019RT09);the Dalian National Laboratory for Clean Energy(DNL),Chinese Academy of Sciences(CAS),DNL Cooperation Fund,CAS(DNL201912,DNL201915,DNL202016,and DNL202019);DICP(DICP ZZBS201802 and DICP I2020032);the Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy(YLU-DNL Fund 2021002 and YLU-DNL Fund 2021009);the China Postdoctoral Science Foundation(2020M680995).

摘　　要：Two-dimensional MXenes are key high-capacitance electrode materials for micro-supercapacitors(MSCs)catering 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 inhibits 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 MnO_(2) nanosheets as the positive electrode(MXene//MnO_(2)-AMSCs).The MXene//MnO_(2)-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 enabled excellent mechanical flexibility and performance uniformity in the serially/parallel connected packs of our AMSCs.Notably,the MXene//MnO_(2)-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.

关 键 词：Asymmetric micro-supercapacitors MXene MnO_(2) Aqueous electrolyte High voltage Integrated microsystem 

分 类 号：O64[理学—物理化学]