S‐Doped Carbon Nanospheres: An Efficient Electrocatalyst toward Artificial N2 Fixation to NH3,Small Methods

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S‐Doped Carbon Nanospheres: An Efficient Electrocatalyst toward Artificial N2 Fixation to NH3
Small Methods ( IF 10.7 ) Pub Date : 2018-12-07 , DOI: 10.1002/smtd.201800251
Li Xia ₁ , Xiufeng Wu ₁ , Yuan Wang ₁ , Zhiguo Niu ₁ , Qian Liu ₂ , Tingshuai Li ₂ , Xifeng Shi ₃ , Abdullah M. Asiri ₄ , Xuping Sun ₁

Affiliation

Industrial NH₃ synthesis mainly relies on the carbon‐emitting Haber–Bosch process operating under severe conditions. Electrocatalytic N₂ to NH₃ fixation at ambient conditions is an attractive approach to reduce energy consumption and avoid direct carbon emission. In this communication, it is reported that the S‐doped carbon nanosphere (S‐CNS) acts as an efficient and stable nitrogen reduction reaction (NRR) catalyst for ambient N₂ to NH₃ conversion with excellent selectivity. In 0.1 m Na₂SO₄, the S‐CNS achieves a large NH₃ yield of 19.07 μg h⁻¹ mg⁻¹_cat. and a high Faradic efficiency of 7.47% at –0.7 V versus reversible hydrogen electrode, much higher than those of undoped CNS (3.70 μg h⁻¹ mg⁻¹_cat., 1.45%). Notably, this catalyst also demonstrates high electrochemical and structure stability.

中文翻译：

掺S的碳纳米球：一种将N2人工固定到NH3的高效电催化剂

工业NH ₃合成主要依赖于在苛刻条件下运行的碳排放Haber-Bosch工艺。在环境条件下将N ₂固定为NH _3的电催化是减少能耗并避免直接碳排放的一种有吸引力的方法。在该通报中，据报道，掺杂S的碳纳米球（S-CNS）可作为一种高效，稳定的氮还原反应（NRR）催化剂，具有出色的选择性，可将环境中的N ₂转化为NH ₃。在0.1 m Na ₂ SO _4中，S-CNS的NH ₃收率很高，为19.07μgh ^-1 mg ^-1_猫。相对于可逆氢电极，在–0.7 V时，法拉第效率高达7.47％，远高于未掺杂的CNS（3.70μgh ^-1 mg ^-1_cat。，1.45％）。值得注意的是，该催化剂还显示出高的电化学和结构稳定性。

更新日期：2018-12-07

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