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High-Capacitance Mechanism for Ti3C2TX MXene by in Situ Electrochemical Raman Spectroscopy Investigation
Hu, Minmin1,2; Li, Zhaojin1,3; Hu, Tao1,3; Zhu, Shihao1,3; Zhang, Chao1; Wang, Xiaohui1
Corresponding AuthorWang, Xiaohui(wang@imr.ac.cn)
2016-12-01
Source PublicationACS NANO
ISSN1936-0851
Volume10Issue:12Pages:11344-11350
AbstractMXenes represent an emerging family of conductive two-dimensional materials. Their representative, Ti3C2Tx, has been recognized as an outstanding member in the field of electrochemical energy storage. However, an in-depth understanding of fundamental processes responsible for the superior capacitance of Ti3C2Tx MXene in acidic electrolytes is lacking. Here, to understand the mechanism of capacitance in Ti3C2Tx MXene, we studied electrochemically the charge/discharge processes of Ti3C2Tx electrodes in sulfate ion-containing aqueous electrolytes with three different cations, coupled with in situ Raman spectroscopy. It is demonstrated that hydronium in the H2SO4 electrolyte bonds with the terminal O in the negative electrode upon discharging while debonding occurs upon charging. Correspondingly, the reversible bonding/debonding changes the valence state of Ti element in the MXene, giving rise to the pseudocapacitance in the acidic electrolyte. In stark contrast, only electric double layer capacitance is recognized in the other electrolytes of (NH4)(2)SO4 or MgSO4. The charge storage ways also differ: ion exchange dominates in H2SO4, while counterion adsorption in the rest. Hydronium that is characterized by smaller hydration radius and less charge is the most mobile among the three cations, facilitating it more kinetically accommodated on the deep adsorption sites between the MXene layers. The two key factors, i.e., surface functional group-involved bonding/debonding-induced pseudocapacitance, and ion exchange-featured charge storage, simultaneously contribute to the superior capacitance of Ti3C2Tx MXene in acidic electrolytes.
KeywordMXene two-dimensional materials in situ Raman spectroscopy charging mechanism pseudocapacitance supercapacitor electrochemical capacitor
Funding OrganizationChinese Academy of Sciences (CAS) ; Shenyang National Laboratory for Materials Science, Institute of Metal Research, CAS
DOI10.1021/acsnano.6b06597
Indexed BySCI
Language英语
Funding ProjectChinese Academy of Sciences (CAS) ; Shenyang National Laboratory for Materials Science, Institute of Metal Research, CAS
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
WOS SubjectChemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS IDWOS:000391079700079
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:233[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/123546
Collection中国科学院金属研究所
Corresponding AuthorWang, Xiaohui
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Hu, Minmin,Li, Zhaojin,Hu, Tao,et al. High-Capacitance Mechanism for Ti3C2TX MXene by in Situ Electrochemical Raman Spectroscopy Investigation[J]. ACS NANO,2016,10(12):11344-11350.
APA Hu, Minmin,Li, Zhaojin,Hu, Tao,Zhu, Shihao,Zhang, Chao,&Wang, Xiaohui.(2016).High-Capacitance Mechanism for Ti3C2TX MXene by in Situ Electrochemical Raman Spectroscopy Investigation.ACS NANO,10(12),11344-11350.
MLA Hu, Minmin,et al."High-Capacitance Mechanism for Ti3C2TX MXene by in Situ Electrochemical Raman Spectroscopy Investigation".ACS NANO 10.12(2016):11344-11350.
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