A membrane-based seawater electrolyser for hydrogen generation

Heping Xie (), Zhiyu Zhao, Tao Liu, Yifan Wu, Cheng Lan, Wenchuan Jiang, Liangyu Zhu, Yunpeng Wang, Dongsheng Yang and Zongping Shao ()
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Heping Xie: Shenzhen University
Zhiyu Zhao: Sichuan University
Tao Liu: Sichuan University
Yifan Wu: Sichuan University
Cheng Lan: Sichuan University
Wenchuan Jiang: Sichuan University
Liangyu Zhu: Southwest Petroleum University
Yunpeng Wang: Sichuan University
Dongsheng Yang: Sichuan University
Zongping Shao: Nanjing Tech University

Nature, 2022, vol. 612, issue 7941, 673-678

Abstract: Abstract Electrochemical saline water electrolysis using renewable energy as input is a highly desirable and sustainable method for the mass production of green hydrogen1–7; however, its practical viability is seriously challenged by insufficient durability because of the electrode side reactions and corrosion issues arising from the complex components of seawater. Although catalyst engineering using polyanion coatings to suppress corrosion by chloride ions or creating highly selective electrocatalysts has been extensively exploited with modest success, it is still far from satisfactory for practical applications8–14. Indirect seawater splitting by using a pre-desalination process can avoid side-reaction and corrosion problems15–21, but it requires additional energy input, making it economically less attractive. In addition, the independent bulky desalination system makes seawater electrolysis systems less flexible in terms of size. Here we propose a direct seawater electrolysis method for hydrogen production that radically addresses the side-reaction and corrosion problems. A demonstration system was stably operated at a current density of 250 milliamperes per square centimetre for over 3,200 hours under practical application conditions without failure. This strategy realizes efficient, size-flexible and scalable direct seawater electrolysis in a way similar to freshwater splitting without a notable increase in operation cost, and has high potential for practical application. Importantly, this configuration and mechanism promises further applications in simultaneous water-based effluent treatment and resource recovery and hydrogen generation in one step.

Date: 2022
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DOI: 10.1038/s41586-022-05379-5

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