Electrochemically active binary anion compounds with tailored oxygen vacancy for energy storage system
- Authors
- Hong, John; Lee, Juwon; Lee, Young-Woo; Park, Woon Bae; Ahn, Docheon; Park, Jong Bae; Pak, Sangyeon; Baik, Jaeyoon; Morris, Stephen M.; Cha, SeungNam; Sohn, Kee-Sun; Sohn, Jung Inn
- Issue Date
- 31-Dec-2019
- Publisher
- Elsevier BV
- Keywords
- Energy storage system; Faradaic redox reaction; Tailored oxygen vacancy; Ni-S-O compound; Reduced binary anion
- Citation
- Journal of Power Sources, v.444
- Journal Title
- Journal of Power Sources
- Volume
- 444
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/3737
- DOI
- 10.1016/j.jpowsour.2019.227301
- ISSN
- 0378-7753
1873-2755
- Abstract
- The search for new materials that exhibit rapid Faradaic energy-storing behavior continues to be ever more important as they offer a promising alternative to battery technology because of their unrivalled ability to deliver large amounts of power along with large amounts of energy. Here, we present a reduced binary anion compound (r-BAC) as a first demonstration of redox-active materials, which are fabricated by a facile and direct activation synthetic method. The r-BAC exhibits excellent energy storage characteristics compared to non-reduced full binary anion compound (f-BAC). Based on the density functional theory (DFT) calculations and the ex-situ chemical study, it is found that the superior electrochemical performance is strongly attributed to not only the Ni cation sites (Ni2+/Ni3+ redox couple) that are energetically more activated by oxygen vacancies, but also to the additive electrochemical activity at the unsaturated sulfur sites (S4+/S6+ redox couple) in a binary anion. Thus, we expect that this study on the binary anion material and the corresponding anion-based charge transfer mechanisms may provide a new strategy for the efficient storage of charge in next-generation energy storage applications.
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Collections - SCH Media Labs > Department of Energy Systems Engineering > 1. Journal Articles
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