首页|A novel multi-channel porous structure facilitating mass transport towards highly efficient alkaline water electrolysis

A novel multi-channel porous structure facilitating mass transport towards highly efficient alkaline water electrolysis

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An advantageous porous architecture of electrodes is pivotal in significantly enhancing alkaline water electrolysis(AWE)efficiency by optimizing the mass transport mechanisms.This effect becomes even more pronounced when aiming to achieve elevated current densities.Herein,we employed a rapid and scalable laser texturing process to craft novel multi-channel porous electrodes.Particularly,the obtained electrodes exhibit the lowest Tafel slope of 79 mV dec-1(HER)and 49 mV dec-1(OER).As antic-ipated,the alkaline electrolyzer(AEL)cell incorporating multi-channel porous electrodes(NP-LT30)exhibited a remarkable improvement in cell efficiency,with voltage drops(from 2.28 to 1.97 V)exceed-ing 300 mV under 1 A cm-1,compared to conventional perforated Ni plate electrodes.This enhancement mainly stemmed from the employed multi-channel porous structure,facilitating mass transport and bub-ble dynamics through an innovative convection mode,surpassing the traditional convection mode.Furthermore,the NP-LT30-based AEL cell demonstrated exceptional durability for 300 h under 1.0 A cm-2.This study underscores the capability of the novel multi-channel porous electrodes to expe-dite mass transport in practical AWE applications.

Alkaline water electrolysisMass transportBubble dynamicsInnovative convection modeMulti-channel porous structure

Xinge Jiang、Vasileios Kyriakou、Chen Song、Xianbin Wang、Sophie Costil、Chunming Deng、Taikai Liu、Tao Jiang、Hanlin Liao

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Université de technologie de Belfort Montbéliard,Centre national de la recherche scientifique,Laboratoire Interdisciplinaire Carnot de Bourgogne,Belfort 90010,France

Department of Chemical Engineering,Engineering and Technology Institute Groningen(ENTEG),University of Groningen,Groningen 9747 AG,The Netherlands

The Institute of New Materials,Guangdong Academy of Science,Guangzhou 510650,Guangdong,China

National Key R&D ProgramAcademy of Sciences Project of Guangdong ProvinceAcademy of Sciences Project of Guangdong ProvinceGDAS'Project of Science and Technology DevelopmentChina Scholarship Council

2023YFE01080002019GDASYL-01020072021GDASYL-202101030632022GDASZH-2022010203-003202108210128

2024

10.1016/j.jechem.2024.02.036

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.93(6)
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