Scholarlink

<p>Electrochemical green ammonia (NH<sub>3</sub>) production using renewable electricity is sustainable but suffers from selectivity-activity-stability trade-off under industrial conditions. Here we report an atomic interface engineering strategy enabling in-situ assembly and coupling of hexaethynylbenzenes on molybdenum-copper oxidesto form an <i>sp</i>-hybridized Mo/Cu-C≡C heterointerface. It features dual <i>d</i>-orbital hybridization (Mo 4<i>d</i>-C 2<i>p</i> and Cu 3<i>d</i>-C 2<i>p</i>) weakening N–O bond by 36.85% and lowering activation barrier by 0.43 eV, reversible electron-buffer facilitating proton-coupled electron transfer, and self-regulated charge compensation between metal atoms and -C≡C- atomic wires, collectively endowing high activity and near-complete hydrogen evolution reaction suppression. The resulting catalyst achieves high NH<sub>3</sub> yielding rate (Y<sub>NH3</sub>, 2.45 mmol h<sup>−1</sup> cm<sup>−2</sup>) and Faradaic efficiency (~100%) under ambient conditions. A prototype flow electrolyzer operating with this catalyst sustains industrial-current densities of 500 mA cm<sup>−2</sup> for 300 hours with &lt;3% activity decay, yielding potable water from nitrate wastewater. The membrane electrode assembly (MEA) achieves&#xa0;380 h stable operation at the same current density with Y<sub>NH3</sub> of 3.64 mmol h<sup>−1</sup> cm<sup>−2</sup>.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Sustainable ammonia synthesis from nitrate wastewater via graphdiyne Mo–Cu–C≡C interfaces

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年8月3日

查看全文
  • Zhaoyang Chen,
  • Shuya Zhao,
  • Qian Xiao,
  • Yue Tian,
  • Xiaofeng Lu,
  • Yurui Xue

摘要

Electrochemical green ammonia (NH3) production using renewable electricity is sustainable but suffers from selectivity-activity-stability trade-off under industrial conditions. Here we report an atomic interface engineering strategy enabling in-situ assembly and coupling of hexaethynylbenzenes on molybdenum-copper oxidesto form an sp-hybridized Mo/Cu-C≡C heterointerface. It features dual d-orbital hybridization (Mo 4d-C 2p and Cu 3d-C 2p) weakening N–O bond by 36.85% and lowering activation barrier by 0.43 eV, reversible electron-buffer facilitating proton-coupled electron transfer, and self-regulated charge compensation between metal atoms and -C≡C- atomic wires, collectively endowing high activity and near-complete hydrogen evolution reaction suppression. The resulting catalyst achieves high NH3 yielding rate (YNH3, 2.45 mmol h−1 cm−2) and Faradaic efficiency (~100%) under ambient conditions. A prototype flow electrolyzer operating with this catalyst sustains industrial-current densities of 500 mA cm−2 for 300 hours with <3% activity decay, yielding potable water from nitrate wastewater. The membrane electrode assembly (MEA) achieves 380 h stable operation at the same current density with YNH3 of 3.64 mmol h−1 cm−2.