Oriented intergrowth of the catalyst layer in membrane electrode assembly for alkaline water electrolysis

Lei Wan, Maobin Pang, Junfa Le, Ziang Xu, Hangyu Zhou, Qin Xu and Baoguo Wang ()
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Lei Wan: Tsinghua University
Maobin Pang: Tsinghua University
Junfa Le: Tsinghua University
Ziang Xu: Tsinghua University
Hangyu Zhou: Tsinghua University
Qin Xu: Tsinghua University
Baoguo Wang: Tsinghua University

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: Abstract The application of membrane electrode assemblies is considered a promising approach for increasing the energy efficiency of conventional alkaline water electrolysis. However, previous investigations have mostly focused on improving membrane conductivity and electrocatalyst activity. This study reports an all-in-one membrane electrode assembly obtained by de novo design. The introduction of a porous membrane readily enables the oriented intergrowth of ordered catalyst layers using solvothermal methods, leading to the formation of an all-in-one MEA for alkaline water electrolysis. This all-in-one MEA features ordered catalyst layers with large surface areas, a low-tortuosity pore structure, integrated catalyst layer/membrane interfaces, and a well-ordered OH- transfer channel. Owing to this design, a high current density of 1000 mA cm−2 is obtained at 1.57 V in 30 wt% KOH, resulting in a 94% energy efficiency. This work highlights the prospects of all-in-one membrane electrode assemblies in designing next-generation high-performance alkaline water electrolysis.

Date: 2022
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DOI: 10.1038/s41467-022-35603-9

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