In-situ direct seawater electrolysis using floating platform in ocean with uncontrollable wave motion

Tao Liu (), Zhiyu Zhao, Wenbin Tang, Yi Chen, Cheng Lan, Liangyu Zhu, Wenchuan Jiang, Yifan Wu, Yunpeng Wang, Zezhou Yang, Dongsheng Yang, Qijun Wang, Lunbo Luo, Taisheng Liu () and Heping Xie ()
Additional contact information
Tao Liu: Shenzhen University & Sichuan University
Zhiyu Zhao: Shenzhen University & Sichuan University
Wenbin Tang: Sichuan University
Yi Chen: Dongfang Electric (Fujian) Innovation Institute Co. Ltd
Cheng Lan: Shenzhen University & Sichuan University
Liangyu Zhu: Sichuan University
Wenchuan Jiang: Shenzhen University & Sichuan University
Yifan Wu: Shenzhen University & Sichuan University
Yunpeng Wang: Shenzhen University
Zezhou Yang: Sichuan University
Dongsheng Yang: Shenzhen University
Qijun Wang: Dongfang Electric Wind Power Co. Ltd
Lunbo Luo: China Three Gorges Corporation
Taisheng Liu: Dongfang Electric (Fujian) Innovation Institute Co. Ltd
Heping Xie: Shenzhen University & Sichuan University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Direct hydrogen production from inexhaustible seawater using abundant offshore wind power offers a promising pathway for achieving a sustainable energy industry and fuel economy. Various direct seawater electrolysis methods have been demonstrated to be effective at the laboratory scale. However, larger-scale in situ demonstrations that are completely free of corrosion and side reactions in fluctuating oceans are lacking. Here, fluctuating conditions of the ocean were considered for the first time, and seawater electrolysis in wave motion environment was achieved. We present the successful scaling of a floating seawater electrolysis system that employed wind power in Xinghua Bay and the integration of a 1.2 Nm3 h−1-scale pilot system. Stable electrolysis operation was achieved for over 240 h with an electrolytic energy consumption of 5 kWh Nm−3 H2 and a high purity (>99.9%) of hydrogen under fluctuating ocean conditions (0~0.9 m wave height, 0~15 m s−1 wind speed), which is comparable to that during onshore water electrolysis. The concentration of impurity ions in the electrolyte was low and stable over a long period of time under complex and changing scenarios. We identified the technological challenges and performances of the key system components and examined the future outlook for this emerging technology.

Date: 2024
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DOI: 10.1038/s41467-024-49639-6

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