High‐Performance Alkaline Seawater Electrolysis with Anomalous Chloride Promoted Oxygen Evolution Reaction
Open accessAbstract
A highly selective and durable oxygen evolution reaction (OER) electrocatalyst is the bottleneck for direct seawater splitting because of side reactions primarily caused by chloride ions (Cl − ). Most studies about OER catalysts in seawater focus on the repulsion of the Cl − to reduce its negative effects. Herein, we demonstrate that the absorption of Cl − on the specific site of a popular OER electrocatalyst, nickel‐iron layered double hydroxide (NiFe LDH), does not have a significant negative impact; rather, it is beneficial for its activity and stability enhancement in natural seawater. A set of in situ characterization techniques reveals that the adsorption of Cl − on the desired Fe site suppresses Fe leaching, and creates more OER‐active Ni sites, improving the catalyst's long‐term stability and activity simultaneously. Therefore, we achieve direct alkaline seawater electrolysis for the very first time on a commercial‐scale alkaline electrolyser (AE, 120 cm 2 electrode area) using the NiFe LDH anode. The new alkaline seawater electrolyser exhibits a reduction in electricity consumption by 20.7 % compared to the alkaline purified water‐based AE using commercial Ni catalyst, achieving excellent durability for 100 h at 200 mA cm −2 .
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Increasing the active site density has been proven to be an effective strategy to increase the activity of the catalyzer.
“increasing the active site density has been proven to be an effective strategy to increase the activity of the catalyzer, which can be achieved by constructing the microstructure of the carbon substrate.37−41”
From Enhanced Water Splitting Electrocatalysis with Heterointerfacial Cobalt Phosphide In Situ Supported on a Cellulose-Derived Carbon Aerogel (2025) · cites this paper as [41]
The Abstract (page unavailable) says chloride adsorption creates more OER-active Ni sites and improves the NiFe LDH catalyst’s activity, supporting the link between more active sites and higher activity in this system. It does not establish increased active-site density as a general strategy or discuss achieving it by constructing a carbon substrate’s microstructure. (LLM, conf=0.82)
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- Authors
- Liu, H., Shen, W., Jin, H., Xu, J., Xi, P., Dong, J., Zheng, Y., & Qiao, S.
- Affiliations
- The University of Adelaide (AU)
- Lanzhou University (CN)
- Chinese Academy of Sciences (CN)
- Corresponding author
- Qiao, Shi‐Zhang
- Venue
- Angewandte Chemie International Edition
- Publisher
- Wiley
- Published
- 2023-10-11
- Volume
- 62
- Issue
- 46
- Pages
- e202311674-e202311674
- ISSN
- 1433-7851 (ISSN-L)
- 1521-3773
- OpenAlex
- W4386758037
- Cited by
- 298
- References
- 2
- Citations by year
- 2026: 77 · 2025: 112 · 2024: 103 · 2023: 6
- FWCI
- 14.23
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Angewandte Chemie International Edition (publishedVersion, other-oa)
- PubMed (publishedVersion)
- Adelaide Research & Scholarship (AR&S) (University of Adelaide) (submittedVersion, cc-by)
- Funders
- Australian Research Council (FL170100154, FT200100062, DP230102027, DP220102596, and DP190103472)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Iron oxide chemistry and applications
- Keywords
- alkaline seawater electrolysis, oxygen evolution reaction, nickel-iron layered double hydroxide, chloride adsorption, hydrogen production, electricity consumption reduction
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