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Surface Functional Groups and Interlayer Water Determine the Electrochemical Capacitance of Ti3C2Tx MXene
Hu, MM; Hu, T; Li, ZJ; Yang, Y; Cheng, RF; Yang, JX; Cui, C; Wang, XH; Wang, XH (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
2018-04-01
Source PublicationACS NANO
ISSN1936-0851
Volume12Issue:4Pages:3578-3586
AbstractMXenes, an emerging class of conductive two-dimensional materials, have been regarded as promising candidates in the field of electrochemical energy storage. The electrochemical performance of their representative Ti3C2Tx, where T represents the surface termination group of F, O, or OH, strongly relies on termination mediated surface functionalization, but an in-depth understanding of the relationship between them remains unresolved. Here, we studied comprehensively the structural feature and electrochemical performance of two kinds of Ti3C2Tx MXenes obtained by etching the Ti3AlC2 precursor in aqueous HF solution at low concentration (6 mol/L) and high concentration of (15 mol/L). A significantly higher capacitance was recognized in a low-concentration HF-etched MXene (Ti3C2Tx-6M) electrode. In situ Raman spectroscopy and X-ray photoelectron spectroscopy demonstrate that Ti3C2Tx-6M has more components of the -O functional group. In combination with X-ray diffraction analysis, low-field H-1 nuclear magnetic resonance spectroscopy in terms of relaxation time unambiguously underlines that Ti3C2Tx-6M is capable of accommodating more high-mobility H2O molecules between the Ti3C2Tx interlayers, enabling more hydrogen ions to be more readily accessible to the active sites of Ti3C2Tx-6M. The two main key factors (i.e., high content of -O functional groups that are involved bonding/debonding-induced pseudocapacitance and more high-mobility water intercalated between the MXene interlayers) simultaneously account for the superior capacitance of the Ti3C2Tx-6M electrode. This study provides a guideline for the rational design and construction of high-capacitance MXene and MXene-based hybrid electrodes in aqueous electrolytes.; MXenes, an emerging class of conductive two-dimensional materials, have been regarded as promising candidates in the field of electrochemical energy storage. The electrochemical performance of their representative Ti3C2Tx, where T represents the surface termination group of F, O, or OH, strongly relies on termination mediated surface functionalization, but an in-depth understanding of the relationship between them remains unresolved. Here, we studied comprehensively the structural feature and electrochemical performance of two kinds of Ti3C2Tx MXenes obtained by etching the Ti3AlC2 precursor in aqueous HF solution at low concentration (6 mol/L) and high concentration of (15 mol/L). A significantly higher capacitance was recognized in a low-concentration HF-etched MXene (Ti3C2Tx-6M) electrode. In situ Raman spectroscopy and X-ray photoelectron spectroscopy demonstrate that Ti3C2Tx-6M has more components of the -O functional group. In combination with X-ray diffraction analysis, low-field H-1 nuclear magnetic resonance spectroscopy in terms of relaxation time unambiguously underlines that Ti3C2Tx-6M is capable of accommodating more high-mobility H2O molecules between the Ti3C2Tx interlayers, enabling more hydrogen ions to be more readily accessible to the active sites of Ti3C2Tx-6M. The two main key factors (i.e., high content of -O functional groups that are involved bonding/debonding-induced pseudocapacitance and more high-mobility water intercalated between the MXene interlayers) simultaneously account for the superior capacitance of the Ti3C2Tx-6M electrode. This study provides a guideline for the rational design and construction of high-capacitance MXene and MXene-based hybrid electrodes in aqueous electrolytes.
description.department[hu, minmin ; hu, tao ; li, zhaojin ; cheng, renfei ; yang, jinxing ; cui, cong ; wang, xiaohui] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china ; [hu, minmin ; cheng, renfei ; yang, jinxing ; cui, cong] univ sci & technol china, sch mat sci & engn, shenyang 110016, liaoning, peoples r china ; [hu, tao ; li, zhaojin] univ chinese acad sci, beijing 100049, peoples r china ; [yang, yi] suzhou niumag analyt instrument corp, suzhou 215163, peoples r china
Keyword2-dimensional Titanium Carbide High Volumetric Capacitance Nuclear-magnetic-resonance Energy-storage Charge Storage Intercalation Spectroscopy Electrodes Oxide Supercapacitors
Subject AreaChemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
Funding OrganizationYouth Innovation Promotion Association; Chinese Academy of Sciences (CAS) [2011152]; Shenyang National Laboratory for Materials Science, Institute of Metal Research, CAS; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund (the second phase) [U1501501]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79383
Collection中国科学院金属研究所
Corresponding AuthorWang, XH (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Hu, MM,Hu, T,Li, ZJ,et al. Surface Functional Groups and Interlayer Water Determine the Electrochemical Capacitance of Ti3C2Tx MXene[J]. ACS NANO,2018,12(4):3578-3586.
APA Hu, MM.,Hu, T.,Li, ZJ.,Yang, Y.,Cheng, RF.,...&Wang, XH .(2018).Surface Functional Groups and Interlayer Water Determine the Electrochemical Capacitance of Ti3C2Tx MXene.ACS NANO,12(4),3578-3586.
MLA Hu, MM,et al."Surface Functional Groups and Interlayer Water Determine the Electrochemical Capacitance of Ti3C2Tx MXene".ACS NANO 12.4(2018):3578-3586.
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