Decoupled electrolysis for hydrogen production and hydrazine oxidation via high-capacity and stable pre-protonated vanadium hexacyanoferrate

Fei Lv, Jiazhe Wu, Xuan Liu, Zhihao Zheng, Lixia Pan, Xuewen Zheng, Liejin Guo and Yubin Chen ()
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Fei Lv: Xi’an Jiaotong University
Jiazhe Wu: Xi’an Jiaotong University
Xuan Liu: Xi’an Jiaotong University
Zhihao Zheng: Xi’an Jiaotong University
Lixia Pan: Xi’an Jiaotong University
Xuewen Zheng: Xi’an Jiaotong University
Liejin Guo: Xi’an Jiaotong University
Yubin Chen: Xi’an Jiaotong University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Decoupled electrolysis for hydrogen production with the aid of a redox mediator enables two half-reactions operating at different rates, time, and spaces, which offers great flexibility in operation. Herein, a pre-protonated vanadium hexacyanoferrate (p-VHCF) redox mediator is synthesized. It offers a high reversible specific capacity up to 128 mAh g−1 and long cycling performance of 6000 cycles with capacity retention about 100% at a current density of 10 A g−1 due to the enhanced hydrogen bonding network. By using this mediator, a membrane-free water electrolytic cell is built to achieve decoupled hydrogen and oxygen production. More importantly, a decoupled electrolysis system for hydrogen production and hydrazine oxidation is constructed, which realizes not only separate hydrogen generation but electricity generation through the p-VHCF-N2H4 liquid battery. Therefore, this work enables the flexible energy conversion and storage with hydrogen production driven by solar cell at day-time and electricity output at night-time.

Date: 2024
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DOI: 10.1038/s41467-024-45321-z

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