journal article·2021-12

Sub‐Nanometer Confined Ions and Solvent Molecules Intercalation Capacitance in Microslits of 2D Materials

Yaqing Guo, Xufeng Hong, Yaqiong Su, Wen Luo, Ruohan Yu, Jinsong Wu, Emiel J. M. Hensen, Liqiang Mai, Yuancheng Cao

Small· Volume 17· Issue 49
Publisher page

Abstract

Abstract The ion intercalation behavior in 2D materials is widely applied in energy storage, electrocatalysis, and desalination. However, the detailed effect of ions on the performance, combining the influence of interlayer force and the change of solvent shell, is far less well understood. Here the solvated alkali metal ions with different sizes are intercalated into the lattice of 2D materials with different spacings (Ti3C2Tx, δ‐MnO2, and reduced graphene oxide) to construct the intercalation model related with sub‐nanometer confined ions and solvent molecules to further understand the intercalation capacitance. Based on electrochemical methods and density functional theory calculation, the ions lose the electrostatic shielding solvent shell or shorten the distance between the layers, resulting in a significant increase in capacitance. It is found that the intercalation capacitance arises from the diffusion of solvated ions and is controlled by quantum and electrochemical capacitance for desolvated ions. This effect of solvation structure on performance can be applied in a variety of electrochemical interface studies and provides a new research view for energy storage mechanisms.
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Research context

OpenAlex topics: Advancements in Battery Materials · Supercapacitor Materials and Fabrication · Advanced Battery Materials and Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 P. R. China

Laboratory of Inorganic Materials and Catalysis Department of Chemical Engineering and Chemistry Eindhoven University of Technology P. O. Box 513 Eindhoven MB 5600 The Netherlands

Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China

State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

Funding

National Natural Science Foundation of China · National Key Research and Development Program of China · Fundamental Research Funds for the Central Universities

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