Origins and Implications of Interfacial Capacitance Enhancements in C60-Modified Graphene Supercapacitors
Abstract
Understanding and controlling the electrical response at a complex electrode–electrolyte interface is key to the development of next-generation supercapacitors and other electrochemical devices. In this work, we apply a theoretical framework based on the effective screening medium and reference interaction site model to explore the role of electrical double-layer (EDL) formation and its interplay with quantum capacitance in graphene-based supercapacitors. In addition to pristine graphene, we investigate a novel C60-modified graphene supercapacitor material, which promises higher charge-storage capacity. Beyond the expected enhancement in the quantum capacitance, we find that the introduction of C60 molecules significantly alters the EDL response. These changes in EDL are traced to the interplay between surface morphology and charge localization character and ultimately dominate the overall capacitive improvement in the hybrid system. Our study highlights a complex interplay among surface morphology, electronic structure, and interfacial capacitance, suggesting general improvement strategies for optimizing carbon-based supercapacitor materials.
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Riverside, CA (United States). Dept. of Chemistry
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
- Univ. of California, Riverside, CA (United States). Dept. of Chemistry
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1512603
- Report Number(s):
- LLNL-JRNL-754189
Journal ID: ISSN 1944-8244; 940742
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Applied Materials and Interfaces
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 43; Journal ID: ISSN 1944-8244
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; electric double layer; energy storage; first-principles simulations; quantum capacitance; supercapacitor
Citation Formats
Zhan, Cheng, Pham, Tuan Anh, Cerón, Maira R., Campbell, Patrick G., Vedharathinam, Vedasri, Otani, Minoru, Jiang, De-en, Biener, Juergen, Wood, Brandon C., and Biener, Monika. Origins and Implications of Interfacial Capacitance Enhancements in C60-Modified Graphene Supercapacitors. United States: N. p., 2018.
Web. doi:10.1021/acsami.8b10349.
Zhan, Cheng, Pham, Tuan Anh, Cerón, Maira R., Campbell, Patrick G., Vedharathinam, Vedasri, Otani, Minoru, Jiang, De-en, Biener, Juergen, Wood, Brandon C., & Biener, Monika. Origins and Implications of Interfacial Capacitance Enhancements in C60-Modified Graphene Supercapacitors. United States. https://doi.org/10.1021/acsami.8b10349
Zhan, Cheng, Pham, Tuan Anh, Cerón, Maira R., Campbell, Patrick G., Vedharathinam, Vedasri, Otani, Minoru, Jiang, De-en, Biener, Juergen, Wood, Brandon C., and Biener, Monika. Mon .
"Origins and Implications of Interfacial Capacitance Enhancements in C60-Modified Graphene Supercapacitors". United States. https://doi.org/10.1021/acsami.8b10349. https://www.osti.gov/servlets/purl/1512603.
@article{osti_1512603,
title = {Origins and Implications of Interfacial Capacitance Enhancements in C60-Modified Graphene Supercapacitors},
author = {Zhan, Cheng and Pham, Tuan Anh and Cerón, Maira R. and Campbell, Patrick G. and Vedharathinam, Vedasri and Otani, Minoru and Jiang, De-en and Biener, Juergen and Wood, Brandon C. and Biener, Monika},
abstractNote = {Understanding and controlling the electrical response at a complex electrode–electrolyte interface is key to the development of next-generation supercapacitors and other electrochemical devices. In this work, we apply a theoretical framework based on the effective screening medium and reference interaction site model to explore the role of electrical double-layer (EDL) formation and its interplay with quantum capacitance in graphene-based supercapacitors. In addition to pristine graphene, we investigate a novel C60-modified graphene supercapacitor material, which promises higher charge-storage capacity. Beyond the expected enhancement in the quantum capacitance, we find that the introduction of C60 molecules significantly alters the EDL response. These changes in EDL are traced to the interplay between surface morphology and charge localization character and ultimately dominate the overall capacitive improvement in the hybrid system. Our study highlights a complex interplay among surface morphology, electronic structure, and interfacial capacitance, suggesting general improvement strategies for optimizing carbon-based supercapacitor materials.},
doi = {10.1021/acsami.8b10349},
journal = {ACS Applied Materials and Interfaces},
number = 43,
volume = 10,
place = {United States},
year = {Mon Oct 08 00:00:00 EDT 2018},
month = {Mon Oct 08 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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