Continuous ammonia electrosynthesis using physically interlocked bipolar membrane at 1000 mA cm−2

Ziang Xu, Lei Wan, Yiwen Liao, Maobin Pang, Qin Xu, Peican Wang and Baoguo Wang ()
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Ziang Xu: Tsinghua University
Lei Wan: Tsinghua University
Yiwen Liao: Tsinghua University
Maobin Pang: Tsinghua University
Qin Xu: Tsinghua University
Peican Wang: Tsinghua University
Baoguo Wang: Tsinghua University

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Electrosynthesis of ammonia from nitrate reduction receives extensive attention recently for its relatively mild conditions and clean energy requirements, while most existed electrochemical strategies can only deliver a low yield rate and short duration for the lack of stable ion exchange membranes at high current density. Here, a bipolar membrane nitrate reduction process is proposed to achieve ionic balance, and increasing water dissociation sites is delivered by constructing a three-dimensional physically interlocked interface for the bipolar membrane. This design simultaneously boosts ionic transfer and interfacial stability compared to traditional ones, successfully reducing transmembrane voltage to 1.13 V at up to current density of 1000 mA cm−2. By combining a Co three-dimensional nanoarray cathode designed for large current and low concentration utilizations, a continuous and high yield bipolar membrane reactor for NH3 electrosynthesis realized a stable electrolysis at 1000 mA cm−2 for over 100 h, Faradaic efficiency of 86.2% and maximum yield rate of 68.4 mg h−1 cm−2 with merely 2000 ppm NO3- alkaline electrolyte. These results show promising potential for artificial nitrogen cycling in the near future.

Date: 2023
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DOI: 10.1038/s41467-023-37273-7

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