首页|Understanding Pseudocapacitance Mechanisms by Synchrotron X-ray Analytical Techniques

Understanding Pseudocapacitance Mechanisms by Synchrotron X-ray Analytical Techniques

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Pseudocapacitive materials that store charges via reversible surface or near-surface faradaic reactions are capable of overcoming the capacity limitations of electrical double-layer capacitors.Revealing the structure-activity relationship between the microstructural features of pseudocapacitive materials and their electrochemical performance on the atomic scale is the key to build high-performance capacitor-type devices containing ideal pseudocapacitance effect.Currently,the high brightness(flux),and spectral and coherent nature of synchrotron X-ray analytical techniques make it a powerful tool for probing the structure-property relationship of pseudocapacitive materials.Herein,we report a comprehensive and systematic review of four typical characterization techniques(synchrotron X-ray diffraction,pair distribution function[PDF]analysis,soft X-ray absorption spectroscopy,and hard X-ray absorption spectroscopy)for the study of pseudocapacitance mechanisms.In addition,we offered significant insights for understanding and identifying pseudocapacitance mechanisms(surface redox pseudocapacitance,intercalation pseudocapacitance,and the extrinsic pseudocapacitance phenomenon in battery materials)by combining in situ hard XAS and electrochemical analyses.Finally,a perspective for further depth of understanding into the pseudocapacitance mechanism using synchrotron X-ray analytical techniques is proposed.

in situ experimentspseudocapacitive materialsstructure-property relationshipsynchrotron X-ray analytical techniques

Pei Tang、Wuyang Tan、Guangyang Deng、Yunting Zhang、Shan Xu、Qijun Wang、Guosheng Li、Jian Zhu、Qingyun Dou、Xingbin Yan

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Department of Materials Science and Engineering,Sun Yat-Sen University,Guangzhou 510275,China

Center of Industrial Analysis and Testing,Guangdong Academy of Science,Guangzhou 510651,China

College of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,China

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaResearch Startup Funds from Sun Yat-Sen UniversityFundamental Research Funds for the Central Universities,Sun Yat-Sen UniversityFundamental Research Funds for the Central Universities,Sun Yat-Sen University

2022YFB24026002227916620030622qntd010122dfx01

2023

10.1002/eem2.12619

能源与环境材料(英文)

能源与环境材料(英文)

CSCD
ISSN：
年,卷(期)：2023.6(4)
  • 164