Achieving ultrahigh electrochemical performance by surface design and nanoconfined water manipulation

Author:

Li Haisheng1,Xu Kui2ORCID,Chen Pohua1,Yuan Youyou13,Qiu Yi1,Wang Ligang1,Zhu Liu4,Wang Xiaoge1,Cai Guohong1,Zheng Liming1,Dai Chun15,Zhou Deng6,Zhang Nian6,Zhu Jixin2,Xie Jinglin17,Liao Fuhui1,Peng Hailin1,Peng Yong8,Ju Jing1,Lin Zifeng9ORCID,Sun Junliang1

Affiliation:

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

Abstract

Abstract 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 Ti3C2 MXene, and the interlayer spacing was significantly increased by accommodating three-layer nanoconfined water. Exceptionally high capacitance of 550 F g–1 (2000 F cm–3) 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.

Publisher

Oxford University Press (OUP)

Subject

Multidisciplinary

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