S-doped amorphous multi-metal borophosphates for efficient alkaline seawater oxidation with a high corrosion resistance

[Display omitted] •Sulfur-doped multi-metal borophosphates are synthesized for enhanced alkaline seawater oxidation.•The negatively charged polyanionic surface layers improve the corrosion resistance.•The optimized catalyst demonstrates excellent electrocatalytic activity and durability.•The catalys...

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Bibliographic Details
Published in:Applied surface science 2025-01, Vol.679, p.161222, Article 161222
Main Authors: Gi Kim, Min, Gaur, Ashish, Su Cho, Min, Kumar Nayak, Arpan, Mhin, Sungwook, Han, HyukSu
Format: Article
Language:English
Subjects:
Amorphous
Borophosphate
Corrosion resistance
Electrocatalyst
Seawater oxidation
Water splitting
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Summary:[Display omitted] •Sulfur-doped multi-metal borophosphates are synthesized for enhanced alkaline seawater oxidation.•The negatively charged polyanionic surface layers improve the corrosion resistance.•The optimized catalyst demonstrates excellent electrocatalytic activity and durability.•The catalyst demonstrates high selectivity for the OER over the chloride evolution reaction (CER). Direct seawater splitting is a promising strategy for the production of green hydrogen to address water shortage and environmental concerns. However, the primary obstacle in direct seawater splitting is directly related to the high selectivity and durability of oxygen evolution reaction (OER) electrocatalysts. In this study, we developed sulfur-doped multimetal (Ni, Fe, and Co) borophosphates (BPOs) as high-performance OER catalysts for alkalized seawater electrolytes. The incorporated sulfur atoms act as precursors to enhance the corrosion resistance, as they form negatively charged polyanionic surface layers that block the chloride ions. The best catalyst demonstrates an overpotential of 278 mV in alkaline freshwater and 292 mV in alkalized seawater electrolytes when subjected to a current density of 100 mA cm−2. The overpotential disparity between the two media was only 14 mV, suggesting that the material has substantial resistance to chloride corrosion. Furthermore, excellent electrochemical durability was attained for the sulfurized and amorphized multi-metal BPOs, highlighting their high potential as promising catalysts for seawater oxidation.
ISSN:0169-4332
DOI:10.1016/j.apsusc.2024.161222