MXene coupled with molybdenum dioxide nanoparticles as 2D-0D pseudocapacitive electrode for high performance flexible asymmetric micro-supercapacitors  

作　　者：Liangzhu Zhang Guoliang Yang Zhiqiang Chen Dan Liu Jiemin Wang Yijun Qian Cheng Chen Yuchen Liu Lifeng Wang Joselito Razal Weiwei Lei 

机构地区：[1]Institute for Frontier Materials,Deakin University,Waurn Ponds Campus,Locked Bag 20000,Victoria,3220,Australia

出　　处：《Journal of Materiomics》2020年第1期138-144,共7页无机材料学学报（英文）

基　　金：financially supported by the Australian Research Council Discovery Program(DP190103290);Australian Research Council Discovery Early Career Researcher Award scheme(DE150101617).

摘　　要：Recently,two-dimensional(2D)transition metal carbides and carbonitrides(MXenes),have shown great potential in micro-supercapacitors(MSCs).However,the maximum voltage output of symmetric MXene MSCs is limited to 0.6 V due to the oxidation effects at high anodic potentials.Herein,we developed asymmetric micro-supercapacitors(AMSCs)based on titanium carbide MXene(Ti_(3)C_(2)Tx)and MXene-MoO_(2) electrodes with an enlarged voltage window of 1.2 V,which is twice wider than that of symmetric MXene MSCs.The 2D-0D MXene-MoO_(2) microelectrode is fabricated by homogenous dispersing zerodimensional(0D)MoO_(2) nanoparticles into MXene layers to impede layers stacking and MoO_(2) nanoparticles aggregation.Notably,the AMSCs delivered good electrochemical performances of areal capacitance of ~19 mF cm^(-2) and volumetric capacitance of 63 F cm^(-3) at a scan rate of 2 mV s^(-1),and high energy density of 9.7 mW h cm^(-3) at a power density of 0.198 W cm^(-3).The AMSCs also presented exceptionally mechanical flexibility under different bending states and excellent cyclic stability,with 88% capacitance retention after 10000 cycles at a discharge current density of 0.5 mA cm^(-2).For practical application,the serially connected AMSCs are fully affordable to power electronics,which is beneficial for soft and wearable power devices.

关 键 词：2D-0D structure Flexible material MXene Molybdenum dioxide Asymmetric micro-supercapacitors Energy storage 

分 类 号：TM53[电气工程—电器] TB383[一般工业技术—材料科学与工程]