Stable Seawater Electrolysis Over 10 000 H via Chemical Fixation of Sulfate on NiFeBa-LDH

Haocheng Chen, Pingying Liu, Wenbo Li, Wenwen Xu, Yingjie Wen, Sixie Zhang, Li Yi, Yeqi Dai, Xu Chen, Sheng Dai, Ziqi Tian, Liang Chen, Zhiyi Lu

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Although hydrogen production through seawater electrolysis combined with offshore renewable energy can significantly reduce the cost, the corrosive anions in seawater strictly limit the commercialization of direct seawater electrolysis technology. Here, it is discovered that electrolytic anode can be uniformly protected in a seawater environment by constructing NiFeBa-LDH catalyst assisted with additional SO42− in the electrolyte. In experiments, the NiFeBa-LDH achieves unprecedented stability over 10 000 h at 400 mA cm−2 in both alkaline saline electrolyte and alkaline seawater. Characterizations and simulations reveal that the atomically dispersed Ba2+ enables the chemical fixation of free SO42− on the surface, which generates a dense SO42− layer to repel Cl along with the preferentially adsorbed SO42− in the presence of an applied electric field. In terms of the simplicity and effectiveness of catalyst design, it is confident that it can be a beacon for the commercialization of seawater electrolysis technology.

Original languageEnglish
JournalAdvanced Materials
DOIs
StateAccepted/In press - 2024
Externally publishedYes

Funding

H.C., P.L., and W.L. contributed equally to this work. This work was supported by the National Key Research and Development Project (Grant No. 2023YFB4005100), the Ningbo Yongjiang Talent Introduction Programme (No. 2021A\u2010036\u2010B), the Ningbo S&T Innovation 2025 Major Special Program (No. 2022Z205) and National Natural Science Foundation of China (No. 52201285). The DFT calculation was supported by the High\u2010Performance Computing Center of Collaborative Innovation Center of Advanced Microstructures, Nanjing University.

FundersFunder number
Nanjing University
High‐Performance Computing Center of Collaborative Innovation Center of Advanced Microstructures
National Key Research and Development Program of China2023YFB4005100
National Key Research and Development Program of China
Ningbo Yongjiang Talent Introduction Programme2021A‐036‐B
Ningbo S&T Innovation 2025 Major Special Program2022Z205
National Natural Science Foundation of China52201285
National Natural Science Foundation of China

    Keywords

    • alkaline seawater electrolysis
    • anti-Cl corrosion
    • chemical fix SO
    • electrochemical H production

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