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<p>Electrocatalytic N<sub>2</sub>O reduction reaction offers a sustainable solution of converting greenhouse gas N<sub>2</sub>O to N<sub>2</sub> under ambient conditions, but achieving high single-pass conversion remains challenging. Here, we present a gas-diffusion-electrolyzer system with copper-silver bimetallic nanoalloy serving as the catalyst for efficient N<sub>2</sub>O reduction, realizing a single-pass conversion rate of 79.4% and a decomposition rate of 1381.7 μmol h<sup>−1</sup> mg<sub>cat</sub><sup>−1</sup> for 10 vol.% N<sub>2</sub>O. Computational fluid dynamics simulation shows that the system optimizes gas flow regime and reduces diffusion distance compared to batch system, ensuring a uniform N<sub>2</sub>O distribution over cathode surface. The combination of Ag with Cu synergistically facilitates the adsorption, hydrogenation, and cleavage of the N–O bond in N<sub>2</sub>O. Techno-economic assessment indicates the levelized N<sub>2</sub>O decomposition cost varies between 1.66−2.14 US$ kg<sup>−1</sup>. Our findings underscore the substantial potential and practical viability of electrocatalytic N<sub>2</sub>O decomposition.</p>

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High single-pass conversion of nitrous oxide to dinitrogen in gas-diffusion-electrolyzer

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月11日

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  • Zhe Li,
  • Jianyang Yuan,
  • Zhongbiao Wu,
  • Xuanhao Wu

摘要

Electrocatalytic N2O reduction reaction offers a sustainable solution of converting greenhouse gas N2O to N2 under ambient conditions, but achieving high single-pass conversion remains challenging. Here, we present a gas-diffusion-electrolyzer system with copper-silver bimetallic nanoalloy serving as the catalyst for efficient N2O reduction, realizing a single-pass conversion rate of 79.4% and a decomposition rate of 1381.7 μmol h−1 mgcat−1 for 10 vol.% N2O. Computational fluid dynamics simulation shows that the system optimizes gas flow regime and reduces diffusion distance compared to batch system, ensuring a uniform N2O distribution over cathode surface. The combination of Ag with Cu synergistically facilitates the adsorption, hydrogenation, and cleavage of the N–O bond in N2O. Techno-economic assessment indicates the levelized N2O decomposition cost varies between 1.66−2.14 US$ kg−1. Our findings underscore the substantial potential and practical viability of electrocatalytic N2O decomposition.