Achieving ultrahigh electrochemical performance by surface design and nanoconfined water manipulation  

作　　者：Haisheng Li Kui Xu Pohua Chen Youyou Yuan Yi Qiu Ligang Wang Liu Zhu Xiaoge Wang Guohong Cai Liming Zheng Chun Dai Deng Zhou Nian Zhang Jixin Zhu Jinglin Xie Fuhui Liao Hailin Peng Yong Peng Jing Ju Zifeng Lin Junliang Sun 

机构地区：[1]College of Chemistry and Molecular Engineering,Beijing National Laboratory for Molecular Sciences,Peking University,Beijing 100871,China [2]Key Laboratory of Flexible Electronics,and Institute of Advanced Materials,Jiangsu National Synergetic Innovation Center for Advanced Materials,Nanjing Tech University,Nanjing 211816,China [3]Core Labs,King Abdullah University of Science and Technology,Thuwal 23955-6900,Saudi Arabia [4]Electron Microscopy Centre of Lanzhou University,Lanzhou University,Lanzhou 730000,China [5]School of Chemical and Environmental Engineering,China University of Mining and Technology,Beijing 100083,China [6]State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China [7]Analytical Instrumentation Center,Peking University,Beijing 100871,China [8]School of Physical Science and Technology,Electron Microscopy Centre of Lanzhou University,and Key Laboratory of Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University,Lanzhou 730000,China [9]College of Materials Science and Engineering,Sichuan University,Chengdu 610065,China

出　　处：《National Science Review》2022年第6期138-147,共10页国家科学评论（英文版）

基　　金：supported by the Ministry of Science and Technology of China (2020YFA0210700 to J.S.);the National Natural Science Foundation of China (22125102, 21871009 and21527803 to J.S.;51771085 and 51571104 to Y.P.);the Natural Science Foundation of Jiangsu Province (BK20200702 to K.X.)。

摘　　要：The effects of nanoconfined water and the charge storage mechanism are crucial to achieving the ultrahigh electrochemical performance of two-dimensional transition metal carbides(MXenes). We propose a facile method to manipulate nanoconfined water through surface chemistry modification. By introducing oxygen and nitrogen surface groups, more active sites were created for TiCMXene, and the interlayer spacing was significantly increased by accommodating three-layer nanoconfined water. Exceptionally high capacitance of 550 F g(2000 F cm) was obtained with outstanding high-rate performance. The atomic scale elucidation of the layer-dependent properties of nanoconfined water and pseudocapacitive charge storage was deeply probed through a combination of ‘computational and experimental microscopy’. We believe that an understanding of, and a manipulation strategy for, nanoconfined water will shed light on ways to improve the electrochemical performance of MXene and other two-dimensional materials.

关 键 词：two-dimensional material MXene nanoconfined water energy storage mechanism SUPERCAPACITORS 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O646[理学—物理化学] TM53[理学—化学]