Chloride-Mediated Electron Buffering on Ni-Fe Anodes for Ampere-Level Alkaline Seawater Electrolysis

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dc.contributor.authorNiu, Q.
dc.contributor.authorGao, F.-Y.
dc.contributor.authorSun, X.
dc.contributor.authorZheng, Y.
dc.contributor.authorQiao, S.-Z.
dc.date.issued2025
dc.descriptionOnlinePubl
dc.description.abstractIn water electrolysis, the long-term stability of anodes is compromised by their degradation under oxidative conditions. This issue becomes more pronounced in seawater electrolysis, where the natural chloride ion (Cl¯) induces the chlorine evolution reaction (ClER) to produce corrosive byproducts. Herein, a series of small organic molecules (SOMs), featuring an aromatic carbon ring with para-positioned carbonyl groups, are integrated with the conventional nickel-iron (Ni-Fe) based anode. This integration triggers a unique electron buffering effect to address anode degradation in natural seawater-based electrolytes. It is found that preferential adsorption of Cl¯ onto SOMs prevents its direct interaction with metal active sites. Furthermore, SOM-Cl serving as an electron buffering group significantly reduces the dissolution of Fe sites under the highly oxidative environment. As a result, the SOM-Cl-engineered anode enhances oxygen evolution activity by ≈1.7 times in seawater compared to pure water. In addition, the rationally designed anode works stably for over 200 h at a high current density of 1.3 A cm¯² in an alkaline seawater electrolyzer (ASE).
dc.description.statementofresponsibilityQian Niu, Fei-Yue Gao, Xiaogang Sun, Yao Zheng, Shi-Zhang Qiao
dc.identifier.citationAdvanced Functional Materials, 2025; 2504872-1-2504872-7
dc.identifier.doi10.1002/adfm.202504872
dc.identifier.issn1616-301X
dc.identifier.issn1616-3028
dc.identifier.orcidNiu, Q. [0000-0003-0991-7838]
dc.identifier.orcidGao, F.-Y. [0000-0002-3811-7509]
dc.identifier.orcidSun, X. [0000-0002-3057-5580]
dc.identifier.orcidZheng, Y. [0000-0002-2411-8041]
dc.identifier.orcidQiao, S.-Z. [0000-0002-1220-1761] [0000-0002-4568-8422]
dc.identifier.urihttps://hdl.handle.net/2440/146646
dc.language.isoen
dc.publisherWiley
dc.relation.granthttp://purl.org/au-research/grants/arc/CE230100032
dc.relation.granthttp://purl.org/au-research/grants/arc/DP230102027
dc.relation.granthttp://purl.org/au-research/grants/arc/DP240102575
dc.relation.granthttp://purl.org/au-research/grants/arc/LP210301397
dc.relation.granthttp://purl.org/au-research/grants/arc/FT200100062
dc.rights© 2025 The Author(s). Advanced Functional Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
dc.source.urihttps://doi.org/10.1002/adfm.202504872
dc.subjectampere-level current density; Cl-mediated electron buffering; oxygen evolution reaction; seawater electrolysis; small organic molecules
dc.titleChloride-Mediated Electron Buffering on Ni-Fe Anodes for Ampere-Level Alkaline Seawater Electrolysis
dc.typeJournal article
pubs.publication-statusPublished online

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