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Single‐Site Gold Catalysts on Hierarchical N‐Doped Porous Noble Carbon for Enhanced Electrochemical Reduction of Nitrogen
Small Methods ( IF 12.4 ) Pub Date : 2018-08-20 , DOI: 10.1002/smtd.201800202
Qing Qin 1 , Tobias Heil 1 , Markus Antonietti 1 , Martin Oschatz 1
Affiliation  

Electrocatalytic reduction of nitrogen (N2) at ambient conditions is an alternative strategy to produce ammonia (NH3) to complement the commonly applied Haber–Bosch process. However, the achievement of high Faradaic efficiencies and high NH3 yield is still challenging. Here, Au single sites stabilized on N‐doped porous and highly oxidizing (“noble”) carbon catalysts showing excellent performance in N2 electroreduction are reported. At a potential of −0.2 V versus reversible hydrogen electrode, a stable NH3 yield of 2.32 µg h−1 cm−2 is produced at a Faradaic efficiency of 12.3%. Besides, there is no notable fluctuation of Faradaic efficiency and NH3 yield in six‐cycle test, which indicates good stability. This work opens up new insights to improve N2 fixation performance by introducing catalytically active single sites into noble carbon materials for N2 electroreduction.

中文翻译:

分层N掺杂多孔稀有碳上的单点金催化剂可增强氮的电化学还原

在环境条件下电催化还原氮(N 2)是产生氨(NH 3)的另一种策略,以补充常用的Haber-Bosch工艺。然而,实现高法拉第效率和高NH 3产量仍然具有挑战性。在此,据报道,在掺N的多孔和高氧化(“贵族”)碳催化剂上稳定的Au单中心在N 2电还原中表现出优异的性能。在相对于可逆氢电极的电位为-0.2 V的情况下,以12.3%的法拉第效率产生了2.32 µg h -1 cm -2的稳定NH 3收率。此外,法拉第效率和NH没有明显的波动六周期测试中的产率为3,表明稳定性良好。通过将催化活性的单个位点引入用于N 2电还原的稀有碳材料中,这项工作为改善N 2固定性能开辟了新的见解。
更新日期:2018-08-20
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