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Title: Spatially decoupled hydrogen evolution in alkaline conditions with a redox targeting-based flow battery
Authors: Ji, Y
Zhang, F 
Zhou, M
Yu, J 
Wang, Q 
Keywords: Decoupling
Hydrogen evolution
Redox flow battery
Redox targeting concept
Issue Date: 31-Jul-2020
Publisher: Elsevier BV
Citation: Ji, Y, Zhang, F, Zhou, M, Yu, J, Wang, Q (2020-07-31). Spatially decoupled hydrogen evolution in alkaline conditions with a redox targeting-based flow battery. International Journal of Hydrogen Energy 45 (38) : 18888-18894. ScholarBank@NUS Repository.
Abstract: © 2020 Hydrogen Energy Publications LLC Conventional water electrolyzer simultaneously generates H2 and O2 in neighboring electrode compartments which raises various issues by gas mixing. Thus, decoupled water electrolysis is desired to avoid the problems. Motivated by the above, spatially decoupled hydrogen evolution reaction (HER) is demonstrated in this work, leveraging a redox targeting-based flow battery employing iron triethanolamine (Fe(III)TEA)-K2MnO4 redox couple. This system spatially separates HER from the electrode compartment. Sustained hydrogen is achieved by reaction between regenerated Fe(II)TEA and water in the negative electrolyte storage tank. The Faradaic efficiency of the decoupled HER is 70% and keeps stable upon prolonged operation. The onset overpotential of HER is 24 mV which is lower than previous studies. We anticipate the approach presented in this work would offer an alternative solution to water electrolysis for scalable and safe hydrogen production with improved gas purity.
Source Title: International Journal of Hydrogen Energy
ISSN: 03603199
DOI: 10.1016/j.ijhydene.2020.05.129
Appears in Collections:Staff Publications

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