V_(2)CT_(X) MXene Sphere for Aqueous Ion Storage  

作　　者：Xinliang Li Mian Li Wenyu Xu Zhaodong Huang Guojin Liang Qi Yang Qing Huang Chunyi Zhi 

机构地区：[1]Key Laboratory of Material Physics,Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450052,China [2]Department of Materials Science and Engineering,City University of Hong Kong,83 Tat Chee Avenue,Kowloon,Hong Kong 999077,China [3]Engineering Laboratory of Advanced Energy Materials,Ningbo Institute of Industrial Technology,Chinese Academy of Sciences,Ningbo,Zhejiang 315201,China [4]Centre for Functional Photonics,City University of Hong Kong,Kowloon,Hong Kong 999077,China

出　　处：《Energy Material Advances》2023年第1期512-521,共10页能源材料前沿（英文）

基　　金：GRF under Project N_CityU11305218;Science Technology and Innovation Committee of Shenzhen Municipality(Grant No.JCYJ20170818103435068);a grant from City University of Hong Kong(9667165);National Natural Science Foundation of China(Grant Nos.21671195 and 91426304).

摘　　要：Despite the remarkable ion-hosting capability of MXenes,their electrochemical performance is restricted to the ion shuttle barrier stemming from the capacious surface and the sluggish chemical activity of intrinsic transition metal layers.Herein,we construct a vertically aligned array of V_(2)CT_(X) flakes utilizing a carbon sphere template(V_(2)CT_(X)@CS),with the interlayer galleries outward facing the external electrolyte,to shorten the diffusion length and mitigate the ion shuttle barrier.Moreover,we leverage the high sensitivity of V_(2)CT_(X) flakes to the water-oxygen environment,fully activating the masked active sites of transition metal layers in an aqueous environment via continuous electrochemical scanning.Aqueous V_(2)CT_(X)@CS/Zn battery delivers a novel capacity enhancement over 42,000 cycles at 10 A g^(−1).After activation,the capacity reaches up to 409 mAh g^(−1) V_(2)CT_(X) at 0.5 A g^(−1) and remains at 122 mAh g^(−1) V_(2)CT_(X) at 18 A g^(−1).With a 0.95-V voltage plateau,the energy density of 330.4 Wh kg^(−1) V_(2)CT_(X) surpasses previous records of aqueous MXene electrodes.

关 键 词：utilizing BATTERY TEMPLATE 

分 类 号：TB34[一般工业技术—材料科学与工程]