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Title: Paradoxical roles of hydrogen in electrochemical performance of graphene: High rate capacity and atomistic origins

Abstract

Atomic hydrogen exists ubiquitously in graphene materials made by chemical methods. Yet determining the effect of hydrogen on the electrochemical performance of graphene remains a significant challenge. Here we report the experimental observations of high rate capacity in hydrogen-treated 3-dimensional (3D) graphene nanofoam electrodes for lithium ion batteries. Structural and electronic characterization suggests that defect sites and hydrogen play synergistic roles in disrupting sp 2 graphene to facilitate fast lithium transport and reversible surface binding, as evidenced by the fast charge-transfer kinetics and increased capacitive contribution in hydrogen-treated 3D graphene. In concert with experiments, multiscale calculations reveal that defect complexes in graphene are prerequisite for low-temperature hydrogenation, and that the hydrogenation of defective or functionalized sites at strained domain boundaries plays a beneficial role in improving rate capacity by opening gaps to facilitate easier Li penetration. Additional reversible capacity is provided by enhanced lithium binding near hydrogen-terminated edge sites. Furthermore, these findings provide qualitative insights in helping the design of graphene-based materials for high-power electrodes.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1251039
Report Number(s):
LLNL-JRNL-670804
Journal ID: ISSN 2045-2322
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal Issue: C; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; graphene; hydrogen; electrochemical performance; first principles; pseudocapacitance

Citation Formats

Ye, Jianchao C., Ong, Mitchell T., Heo, Tae Wook, Campbell, Patrick G., Worsley, Marcus A., Liu, Yuanyue Y., Charnvanichborikarn, Supakit, Matthews, Manyalibo J., Bagge-Hansen, Michael, Lee, Jonathan R. I., Wood, Brandon C., Wang, Y. Morris, and Shin, Swanee J. Paradoxical roles of hydrogen in electrochemical performance of graphene: High rate capacity and atomistic origins. United States: N. p., 2015. Web. doi:10.1038/srep16190.
Ye, Jianchao C., Ong, Mitchell T., Heo, Tae Wook, Campbell, Patrick G., Worsley, Marcus A., Liu, Yuanyue Y., Charnvanichborikarn, Supakit, Matthews, Manyalibo J., Bagge-Hansen, Michael, Lee, Jonathan R. I., Wood, Brandon C., Wang, Y. Morris, & Shin, Swanee J. Paradoxical roles of hydrogen in electrochemical performance of graphene: High rate capacity and atomistic origins. United States. doi:10.1038/srep16190.
Ye, Jianchao C., Ong, Mitchell T., Heo, Tae Wook, Campbell, Patrick G., Worsley, Marcus A., Liu, Yuanyue Y., Charnvanichborikarn, Supakit, Matthews, Manyalibo J., Bagge-Hansen, Michael, Lee, Jonathan R. I., Wood, Brandon C., Wang, Y. Morris, and Shin, Swanee J. Thu . "Paradoxical roles of hydrogen in electrochemical performance of graphene: High rate capacity and atomistic origins". United States. doi:10.1038/srep16190. https://www.osti.gov/servlets/purl/1251039.
@article{osti_1251039,
title = {Paradoxical roles of hydrogen in electrochemical performance of graphene: High rate capacity and atomistic origins},
author = {Ye, Jianchao C. and Ong, Mitchell T. and Heo, Tae Wook and Campbell, Patrick G. and Worsley, Marcus A. and Liu, Yuanyue Y. and Charnvanichborikarn, Supakit and Matthews, Manyalibo J. and Bagge-Hansen, Michael and Lee, Jonathan R. I. and Wood, Brandon C. and Wang, Y. Morris and Shin, Swanee J.},
abstractNote = {Atomic hydrogen exists ubiquitously in graphene materials made by chemical methods. Yet determining the effect of hydrogen on the electrochemical performance of graphene remains a significant challenge. Here we report the experimental observations of high rate capacity in hydrogen-treated 3-dimensional (3D) graphene nanofoam electrodes for lithium ion batteries. Structural and electronic characterization suggests that defect sites and hydrogen play synergistic roles in disrupting sp2 graphene to facilitate fast lithium transport and reversible surface binding, as evidenced by the fast charge-transfer kinetics and increased capacitive contribution in hydrogen-treated 3D graphene. In concert with experiments, multiscale calculations reveal that defect complexes in graphene are prerequisite for low-temperature hydrogenation, and that the hydrogenation of defective or functionalized sites at strained domain boundaries plays a beneficial role in improving rate capacity by opening gaps to facilitate easier Li penetration. Additional reversible capacity is provided by enhanced lithium binding near hydrogen-terminated edge sites. Furthermore, these findings provide qualitative insights in helping the design of graphene-based materials for high-power electrodes.},
doi = {10.1038/srep16190},
journal = {Scientific Reports},
number = C,
volume = 5,
place = {United States},
year = {2015},
month = {11}
}

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