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

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

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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.

Asymmetric micro-supercapacitorsMXeneMnO2Aqueous electrolyteHigh voltageIntegrated microsystem

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

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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

Dalian National Laboratory for Clean Energy,Chinese Academy of Sciences,Dalian 116023,China

College of Science,Henan Agricultural University,Zhengzhou 450002,China

University of Chinese Academy of Sciences,Shijingshan District,Beijing 100049,China

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国家自然科学基金国家自然科学基金国家自然科学基金the"Transformational Technologies for Clean Energy and Demonstration"Strategic Priority Research Program of the Chinese Academy Dalian Innovation Support Plan for High Level TalentsDalian National Laboratory for Clean Energy(DNL)Chinese Academy of Sciences(CAS)DNL Cooperation Fund,CASDNL Cooperation Fund,CASDNL Cooperation Fund,CASDNL Cooperation Fund,CASDICPDICPJoint Fund of the Yulin UniversityDalian National Laboratory for Clean EnergyDalian National Laboratory for Clean Energy中国博士后科学基金

220052972212590351872283XDA210000002019RT09DNL201912DNL201915DNL202016DNL202019DICP ZZBS201802DICP I2020032YLU-DNL Fund 2021002YLU-DNL Fund 20210092020M680995

2024

10.1016/j.fmre.2022.03.021

自然科学基础研究(英文)

自然科学基础研究(英文)

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年,卷(期)：2024.(2)
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