TY - JOUR
T1 - Proton-regulated alcohol oxidation for high-capacity ketone-based flow battery anolyte
AU - Feng, Ruozhu
AU - Chen, Ying
AU - Zhang, Xin
AU - Rousseau, Benjamin J.G.
AU - Gao, Peiyuan
AU - Chen, Ping
AU - Mergelsberg, Sebastian T.
AU - Zhong, Lirong
AU - Hollas, Aaron
AU - Liang, Yangang
AU - Murugesan, Vijayakumar
AU - Huang, Qian
AU - Walter, Eric
AU - Hammes-Schiffer, Sharon
AU - Shao, Yuyan
AU - Wang, Wei
N1 - Publisher Copyright:
© 2023 Elsevier Inc.
PY - 2023/7/19
Y1 - 2023/7/19
N2 - Redox flow batteries have a unique architecture that potentially enables cost-effective long-duration energy storage to address the intermittency introduced by increased renewable integration for the decarbonization of the electric power sector. Targeted molecular engineering has demonstrated electrochemical reversibility in natively redox-inactive ketone molecules in aqueous electrolytes. However, the kinetics of fluorenone-based flow batteries continue to be limited by slow alcohol oxidation. We show how strategically designed proton regulators can accelerate alcohol oxidation and thus enhance battery kinetics. Fluorenone-based flow batteries with the organic additive β-cyclodextrin demonstrate enhanced rate capability, high capacity, and long cycling. This study opens a new avenue to improve the kinetics of aqueous organic flow batteries by modulating the reaction pathway with a homogeneous catalyst.
AB - Redox flow batteries have a unique architecture that potentially enables cost-effective long-duration energy storage to address the intermittency introduced by increased renewable integration for the decarbonization of the electric power sector. Targeted molecular engineering has demonstrated electrochemical reversibility in natively redox-inactive ketone molecules in aqueous electrolytes. However, the kinetics of fluorenone-based flow batteries continue to be limited by slow alcohol oxidation. We show how strategically designed proton regulators can accelerate alcohol oxidation and thus enhance battery kinetics. Fluorenone-based flow batteries with the organic additive β-cyclodextrin demonstrate enhanced rate capability, high capacity, and long cycling. This study opens a new avenue to improve the kinetics of aqueous organic flow batteries by modulating the reaction pathway with a homogeneous catalyst.
KW - H-bonding
KW - H/D exchange
KW - alcohol oxidation
KW - comproportionation
KW - fluorenone
KW - homogeneous catalysis
KW - in situ Electron paramagnetic resonance
KW - proton coupled electron transfer
KW - redox flow battery
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U2 - 10.1016/j.joule.2023.06.013
DO - 10.1016/j.joule.2023.06.013
M3 - Article
AN - SCOPUS:85165066708
SN - 2542-4351
VL - 7
SP - 1609
EP - 1622
JO - Joule
JF - Joule
IS - 7
ER -