Surface Redox Pseudocapacitance of Partially Oxidized Titanium Carbide MXene in Water-in-Salt Electrolyte

Xuehang Wang; Seong Min Bak; Meikang Han; Christopher E. Shuck; Conlan McHugh; Ke Li; Jianmin Li; Jun Tang; Yury Gogotsi

doi:10.1021/acsenergylett.1c02262

Surface Redox Pseudocapacitance of Partially Oxidized Titanium Carbide MXene in Water-in-Salt Electrolyte

Xuehang Wang, Seong Min Bak, Meikang Han, Christopher E. Shuck, Conlan McHugh, Ke Li, Jianmin Li, Jun Tang, Yury Gogotsi

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

Achieving pseudocapacitive intercalation in MXenes with neutral aqueous electrolytes and driving reversible redox reactions is scientifically appealing and practically useful. Here, we report that the partial oxidation of MXene intensifies pseudocapacitive Li⁺ intercalation into Ti₃C₂T_x MXene from neutral water-in-salt electrolytes. An in situ X-ray absorption near-edge structure analysis shows that the Ti oxidation state changes during the Li⁺ intercalation, indicating the presence of a surface redox reaction. The Ti oxidation/reduction is further confirmed by an in situ extended X-ray absorption fine structure analysis, which shows a reversible contraction/expansion of the Ti–C interatomic distance. The intensified Li⁺ pseudocapacitive intercalation can be explained by the higher oxidation state of Ti at the open circuit potential. This work demonstrates the possibility of tuning the pseudocapacitive intercalation by adjusting the initial oxidation state of the transition metal on the MXene and offers a facile way to enhance the pseudocapacitance of various MXenes.

Original language	English
Pages (from-to)	30-35
Number of pages	6
Journal	ACS Energy Letters
Volume	7
Issue number	1
DOIs	https://doi.org/10.1021/acsenergylett.1c02262
Publication status	Published - 2022 Jan 14

Bibliographical note

Funding Information:
This research was sponsored by the Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, and Office of Basic Energy Sciences. The XAS research used beamline 7-BM (QAS) and 21-ID-2 (EMS) of the National Synchrotron Light Source II, a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. This research used resources of the Center for Functional Nanomaterials, which is a US DOE Office of Science Facility, at Brookhaven National Laboratory under Contract No. DE-SC0012704. The authors would also like to acknowledge the usage of the X-ray diffractometers provided by Drexel University Materials Characterization Core (MCC). X.W.’s research at Drexel University was supported by a Cotswold Foundation Postdoctoral Fellowship.

Funding Information:
This research was sponsored by the Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, and Office of Basic Energy Sciences. The XAS research used beamline 7-BM (QAS) and 21-ID-2 (EMS) of the National Synchrotron Light Source II, a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. This research used resources of the Center for Functional Nanomaterials, which is a US DOE Office of Science Facility, at Brookhaven National Laboratory under Contract No. DE-SC0012704. The authors would also like to acknowledge the usage of the X-ray diffractometers provided by Drexel University Materials Characterization Core (MCC). X.W.?s research at Drexel University was supported by a Cotswold Foundation Postdoctoral Fellowship.

Publisher Copyright:
© 2021 American Chemical Society

All Science Journal Classification (ASJC) codes

Chemistry (miscellaneous)
Renewable Energy, Sustainability and the Environment
Fuel Technology
Energy Engineering and Power Technology
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1021/acsenergylett.1c02262

Cite this

@article{c186c71d75974740a83038da3ab49182,

title = "Surface Redox Pseudocapacitance of Partially Oxidized Titanium Carbide MXene in Water-in-Salt Electrolyte",

abstract = "Achieving pseudocapacitive intercalation in MXenes with neutral aqueous electrolytes and driving reversible redox reactions is scientifically appealing and practically useful. Here, we report that the partial oxidation of MXene intensifies pseudocapacitive Li+ intercalation into Ti3C2Tx MXene from neutral water-in-salt electrolytes. An in situ X-ray absorption near-edge structure analysis shows that the Ti oxidation state changes during the Li+ intercalation, indicating the presence of a surface redox reaction. The Ti oxidation/reduction is further confirmed by an in situ extended X-ray absorption fine structure analysis, which shows a reversible contraction/expansion of the Ti–C interatomic distance. The intensified Li+ pseudocapacitive intercalation can be explained by the higher oxidation state of Ti at the open circuit potential. This work demonstrates the possibility of tuning the pseudocapacitive intercalation by adjusting the initial oxidation state of the transition metal on the MXene and offers a facile way to enhance the pseudocapacitance of various MXenes.",

author = "Xuehang Wang and Bak, {Seong Min} and Meikang Han and Shuck, {Christopher E.} and Conlan McHugh and Ke Li and Jianmin Li and Jun Tang and Yury Gogotsi",

note = "Funding Information: This research was sponsored by the Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, and Office of Basic Energy Sciences. The XAS research used beamline 7-BM (QAS) and 21-ID-2 (EMS) of the National Synchrotron Light Source II, a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. This research used resources of the Center for Functional Nanomaterials, which is a US DOE Office of Science Facility, at Brookhaven National Laboratory under Contract No. DE-SC0012704. The authors would also like to acknowledge the usage of the X-ray diffractometers provided by Drexel University Materials Characterization Core (MCC). X.W.{\textquoteright}s research at Drexel University was supported by a Cotswold Foundation Postdoctoral Fellowship. Funding Information: This research was sponsored by the Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, and Office of Basic Energy Sciences. The XAS research used beamline 7-BM (QAS) and 21-ID-2 (EMS) of the National Synchrotron Light Source II, a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. This research used resources of the Center for Functional Nanomaterials, which is a US DOE Office of Science Facility, at Brookhaven National Laboratory under Contract No. DE-SC0012704. The authors would also like to acknowledge the usage of the X-ray diffractometers provided by Drexel University Materials Characterization Core (MCC). X.W.?s research at Drexel University was supported by a Cotswold Foundation Postdoctoral Fellowship. Publisher Copyright: {\textcopyright} 2021 American Chemical Society",

year = "2022",

month = jan,

day = "14",

doi = "10.1021/acsenergylett.1c02262",

language = "English",

volume = "7",

pages = "30--35",

journal = "ACS Energy Letters",

issn = "2380-8195",

publisher = "American Chemical Society",

number = "1",

}

TY - JOUR

T1 - Surface Redox Pseudocapacitance of Partially Oxidized Titanium Carbide MXene in Water-in-Salt Electrolyte

AU - Wang, Xuehang

AU - Bak, Seong Min

AU - Han, Meikang

AU - Shuck, Christopher E.

AU - McHugh, Conlan

AU - Li, Ke

AU - Li, Jianmin

AU - Tang, Jun

AU - Gogotsi, Yury

N1 - Funding Information: This research was sponsored by the Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, and Office of Basic Energy Sciences. The XAS research used beamline 7-BM (QAS) and 21-ID-2 (EMS) of the National Synchrotron Light Source II, a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. This research used resources of the Center for Functional Nanomaterials, which is a US DOE Office of Science Facility, at Brookhaven National Laboratory under Contract No. DE-SC0012704. The authors would also like to acknowledge the usage of the X-ray diffractometers provided by Drexel University Materials Characterization Core (MCC). X.W.’s research at Drexel University was supported by a Cotswold Foundation Postdoctoral Fellowship. Funding Information: This research was sponsored by the Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, and Office of Basic Energy Sciences. The XAS research used beamline 7-BM (QAS) and 21-ID-2 (EMS) of the National Synchrotron Light Source II, a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. This research used resources of the Center for Functional Nanomaterials, which is a US DOE Office of Science Facility, at Brookhaven National Laboratory under Contract No. DE-SC0012704. The authors would also like to acknowledge the usage of the X-ray diffractometers provided by Drexel University Materials Characterization Core (MCC). X.W.?s research at Drexel University was supported by a Cotswold Foundation Postdoctoral Fellowship. Publisher Copyright: © 2021 American Chemical Society

PY - 2022/1/14

Y1 - 2022/1/14

N2 - Achieving pseudocapacitive intercalation in MXenes with neutral aqueous electrolytes and driving reversible redox reactions is scientifically appealing and practically useful. Here, we report that the partial oxidation of MXene intensifies pseudocapacitive Li+ intercalation into Ti3C2Tx MXene from neutral water-in-salt electrolytes. An in situ X-ray absorption near-edge structure analysis shows that the Ti oxidation state changes during the Li+ intercalation, indicating the presence of a surface redox reaction. The Ti oxidation/reduction is further confirmed by an in situ extended X-ray absorption fine structure analysis, which shows a reversible contraction/expansion of the Ti–C interatomic distance. The intensified Li+ pseudocapacitive intercalation can be explained by the higher oxidation state of Ti at the open circuit potential. This work demonstrates the possibility of tuning the pseudocapacitive intercalation by adjusting the initial oxidation state of the transition metal on the MXene and offers a facile way to enhance the pseudocapacitance of various MXenes.

AB - Achieving pseudocapacitive intercalation in MXenes with neutral aqueous electrolytes and driving reversible redox reactions is scientifically appealing and practically useful. Here, we report that the partial oxidation of MXene intensifies pseudocapacitive Li+ intercalation into Ti3C2Tx MXene from neutral water-in-salt electrolytes. An in situ X-ray absorption near-edge structure analysis shows that the Ti oxidation state changes during the Li+ intercalation, indicating the presence of a surface redox reaction. The Ti oxidation/reduction is further confirmed by an in situ extended X-ray absorption fine structure analysis, which shows a reversible contraction/expansion of the Ti–C interatomic distance. The intensified Li+ pseudocapacitive intercalation can be explained by the higher oxidation state of Ti at the open circuit potential. This work demonstrates the possibility of tuning the pseudocapacitive intercalation by adjusting the initial oxidation state of the transition metal on the MXene and offers a facile way to enhance the pseudocapacitance of various MXenes.

UR - http://www.scopus.com/inward/record.url?scp=85120630324&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85120630324&partnerID=8YFLogxK

U2 - 10.1021/acsenergylett.1c02262

DO - 10.1021/acsenergylett.1c02262

M3 - Article

AN - SCOPUS:85120630324

SN - 2380-8195

VL - 7

SP - 30

EP - 35

JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 1

ER -

Surface Redox Pseudocapacitance of Partially Oxidized Titanium Carbide MXene in Water-in-Salt Electrolyte

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this