Ambient Electrosynthesis of Ammonia: Electrode Porosity and Composition Engineering.
Ambient Electrosynthesis of Ammonia: Electrode Porosity and Composition Engineering.
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DOI：
10.1002/anie.201805514
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发表时间：
2018-07
影响因子：
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通讯作者：
Hong Wang;J. Jia;Pengfei Song;Qiang Wang;Debao Li;Shixiong Min;Chenxi Qian;Lu Wang;Young Feng Li-Yo
中科院分区：
文献类型：
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作者：
Hong Wang;J. Jia;Pengfei Song;Qiang Wang;Debao Li;Shixiong Min;Chenxi Qian;Lu Wang;Young Feng Li-Yo
氨是化肥生产的关键前体、便捷的氢载体和新兴的清洁燃料，在维持地球生命方面发挥着关键作用。目前，NH3合成的主要途径是非均相催化Haber-Bosch工艺（N2+3H2→2NH3），该工艺在极端的温度和压力条件下进行，碳足迹非常大。在此，我们报道了一种原始的氮掺杂纳米多孔石墨碳膜（NCM）可以在环境条件下将酸性水溶液中的 N2 电化学转化为 NH3。 NCM电极上的法拉第效率和NH3产率分别达到5.2%和0.08 g m-2 h-1 。使用 Au 纳米颗粒对 NCM 进行功能化，可将这些性能指标分别显着提高至 22% 和 0.36 g m-2 h-1 。由于该系统具有扩展到工业水平的潜力，因此它很可能取代具有百年历史的哈伯-博世工艺。
Ammonia, a key precursor for fertilizer production, convenient hydrogen carrier, and emerging clean fuel, plays a pivotal role in sustaining life on Earth. Currently, the main route for NH3 synthesis is by the heterogeneous catalytic Haber-Bosch process (N2 +3 H2 →2 NH3 ), which proceeds under extreme conditions of temperature and pressure with a very large carbon footprint. Herein we report that a pristine nitrogen-doped nanoporous graphitic carbon membrane (NCM) can electrochemically convert N2 into NH3 in an acidic aqueous solution under ambient conditions. The Faradaic efficiency and rate of production of NH3 on the NCM electrode reach 5.2 % and 0.08 g m-2 h-1 , respectively. Functionalization of the NCM with Au nanoparticles dramatically enhances these performance metrics to 22 % and 0.36 g m-2 h-1 , respectively. As this system offers the potential to be scaled to industrial levels it is highly likely that it might displace the century-old Haber-Bosch process.