Altered Redox Behavior of Hydroquinone Induced by Nanoconfinement Effects at Microporous Carbon
- Title
- Altered Redox Behavior of Hydroquinone Induced by Nanoconfinement Effects at Microporous Carbon
- Author
- 양지해
- Alternative Author(s)
- Yang Jee Hae
- Advisor(s)
- 장진호
- Issue Date
- 2024. 2
- Publisher
- 한양대학교 대학원
- Degree
- Master
- Abstract
- Nanoconfinement of redox molecules influences their molecular interactions and leads to stabilization of a metastable form by alternation of their chemical reactivity, which is not observed in the bulk. Herein, we show that hydro- and benzoquinone can be (electro)chemically confined with imidazole in sub nanometer-sized carbon pore regimes, and their chemical degradation induced by nucleophilic attacks was significantly mitigated. On the other hand, the formation of a quinone-imidazole complex became evident in a bulk solution phase containing both benzoquinone and imidazole. Molecular dynamic simulations and density functional theory calculation results clearly elucidated the stabilization of both hydro- and benzoquinone in a sub-nanometer sized carbon space due to their strong interactions with a carbon surface, which was thermodynamically more preferred than the formation of a quinone-Im complex. We further experimentally found imidazole played a central role in stabilizing both hydro- and benzoquinone inside the restrained carbon pore regime. The charge-discharge characteristics associated with redox reactions by confined hydro- and benzoquinone in a microporous carbon regime were investigated and showed ~ 97% capacity retention rate over the 100th cycle. The enhanced electrode kinetics of confined quinone redox reaction on a mesoporous carbon electrode was also discussed. This study demonstrated that the physicochemical nature of hydro- and benzoquinone can be altered by their (electro)chemical confinement with imidazole in a sub nanometer-sized carbon regime, and their resilience against the nucleophilic attack could impact the development of various quinone-based aqueous energy storage systems for long term cyclability.
- URI
- http://hanyang.dcollection.net/common/orgView/200000722290https://repository.hanyang.ac.kr/handle/20.500.11754/188445
- Appears in Collections:
- GRADUATE SCHOOL[S](대학원) > CHEMISTRY(화학과) > Theses (Master)
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