Highly Stable Perovskite Oxides for Electrocatalytic Acidic NOx Reduction Streamlining Ammonia Synthesis from Air

Xuecheng Guo, Zhongliao Wang, Yuan Gao, Chao Zhang, Shuai Zhang, Shuaikang Sang, Jun Ma, Shuhui Sun, Dmitry Yu Murzin, Jingxiang Low*, Tao Shao*, Yujie Xiong*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

Electrochemical nitrogen oxide ions reduction reaction (NOxRR) shows great opportunity for ammonia production under ambient conditions. Yet, performing NOxRR in strong acidic conditions remains challenging due to the corrosion effect on the catalyst and competing hydrogen evolution reactions. Here, we demonstrate a stable La1.5Sr0.5Ni0.5Fe0.5O4 perovskite oxide for the NOxRR at pH 0, achieving a Faradaic efficiency for ammonia of approaching 100 % at a current density of 2 A cm−2 in a H-type cell. At industrially relevant current density, the NOxRR system shows stable cell voltage and Faradaic efficiency for >350 h in membrane electrode assembly (MEA) at pH 0. By integrating the catalyst in a stacked MEA with a series connection, we have successfully obtained a record-breaking 2.578 g h−1 NH3 production rate at 20 A. This catalyst‘s unique acid-operability streamlines downstream ammonia utilization for direct ammonium salt production and upstream integration with NOx sources. Techno-economic and lifecycle assessments reveal substantial economic advantages for this ammonia production strategy, even when coupled with a plasma-based NOx production system, presenting a sustainable complement to the conventional Haber–Bosch process.

Original languageEnglish
Article numbere202410517
JournalAngewandte Chemie International Edition
Volume63
Issue number40
DOIs
Publication statusPublished - 1 Oct 2024
MoE publication typeA1 Journal article-refereed

Keywords

  • economical efficiency
  • electrocatalytic reduction
  • NO-to-ammonia
  • sustainable ammonia production

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