Co-production of hydrogen, oxygen, and electricity via an integrated solar-driven system with decoupled water electrolyzer and Na-Zn ion battery

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作   者：

Fei Lv;  Longjie Liu;  Jiazhe Wu;  Pengfei Wang;  Lixia Pan;  Dengwei Jing;  Yubin Chen; 

作者机构：

International Research Center for Renewable Energy; 

期刊名称：

Journal of Energy Chemistry

i s s n：

2095-4956

年卷期：

2025 年 100 卷 001 期

页   码：

621-627

摘   要：

Combining water electrolysis and rechargeable battery technologies into a single system holds great promise for the co-production of hydrogen （H2） and electricity.However,the design and development of such systems is still in its infancy.Herein,an integrated hydrogen-oxygen （O2）-electricity co-production system featuring a bipolar membrane-assisted decoupled electrolyzer and a Na-Zn ion battery was established with sodium nickelhexacyanoferrate （NaNiHCF） and Zn2+/Zn as dual redox electrodes.The decoupled electrolyzer enables to produce H2 and O2 in different time and space with almost 100%Faradaic efficiency at 100 mA cm-2.Then,the charged NaNiHCF and Zn electrodes after the electrolysis processes formed a Na-Zn ion battery,which can generate electricity with an average cell voltage of 1.75 V at 10 m A cm-2.By connecting Si photovoltaics with the modular electrochemical device,a well-matched solar driven system was built to convert the intermittent solar energy into hydrogen and electric energy with a solar to hydrogen-electricity efficiency of 16.7%,demonstrating the flexible storage and conversion of renewables.