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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Fei Lv & Jiazhe Wu & Xuan Liu & Zhihao Zheng & Lixia Pan & Xuewen Zheng & Liejin Guo & Yubin Chen, 2024. "Decoupled electrolysis for hydrogen production and hydrazine oxidation via high-capacity and stable pre-protonated vanadium hexacyanoferrate," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45321-z
    DOI: 10.1038/s41467-024-45321-z
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    3. Long Chen & Xiaoli Dong & Yonggang Wang & Yongyao Xia, 2016. "Separating hydrogen and oxygen evolution in alkaline water electrolysis using nickel hydroxide," Nature Communications, Nature, vol. 7(1), pages 1-8, September.
    4. Zhaowei Guo & Jianhang Huang & Xiaoli Dong & Yongyao Xia & Lei Yan & Zhuo Wang & Yonggang Wang, 2020. "An organic/inorganic electrode-based hydronium-ion battery," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
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