A corrosion-resistant RuMoNi catalyst for efficient and long-lasting seawater oxidation and anion exchange membrane electrolyzer

Xin Kang, Fengning Yang, Zhiyuan Zhang, Heming Liu, Shiyu Ge, Shuqi Hu, Shaohai Li, Yuting Luo, Qiangmin Yu (), Zhibo Liu, Qiang Wang, Wencai Ren, Chenghua Sun, Hui-Ming Cheng and Bilu Liu ()
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Xin Kang: Tsinghua University
Fengning Yang: Tsinghua University
Zhiyuan Zhang: Tsinghua University
Heming Liu: Tsinghua University
Shiyu Ge: Tsinghua University
Shuqi Hu: Tsinghua University
Shaohai Li: Tsinghua University
Yuting Luo: Tsinghua University
Qiangmin Yu: Tsinghua University
Zhibo Liu: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Qiang Wang: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Wencai Ren: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Chenghua Sun: Swinburne University of Technology, Hawthorn
Hui-Ming Cheng: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Bilu Liu: Tsinghua University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Direct seawater electrolysis is promising for sustainable hydrogen gas (H2) production. However, the chloride ions in seawater lead to side reactions and corrosion, which result in a low efficiency and poor stability of the electrocatalyst and hinder the use of seawater electrolysis technology. Here we report a corrosion-resistant RuMoNi electrocatalyst, in which the in situ-formed molybdate ions on its surface repel chloride ions. The electrocatalyst works stably for over 3000 h at a high current density of 500 mA cm−2 in alkaline seawater electrolytes. Using the RuMoNi catalyst in an anion exchange membrane electrolyzer, we report an energy conversion efficiency of 77.9% and a current density of 1000 mA cm−2 at 1.72 V. The calculated price per gallon of gasoline equivalent (GGE) of the H2 produced is $ 0.85, which is lower than the 2026 technical target of $ 2.0/GGE set by the United Stated Department of Energy, thus, suggesting practicability of the technology.

Date: 2023
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DOI: 10.1038/s41467-023-39386-5

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