High-Efficiency Electrosynthesis of Ammonia with High Selectivity under Ambient Conditions Enabled by VN Nanosheet Array,ACS Sustainable Chemistry & Engineering

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High-Efficiency Electrosynthesis of Ammonia with High Selectivity under Ambient Conditions Enabled by VN Nanosheet Array
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-07-13 00:00:00 , DOI: 10.1021/acssuschemeng.8b01261
Rong Zhang _{1,

2} , Ya Zhang _{1,

2} , Xiang Ren ₁ , Guanwei Cui ₃ , Abdullah M. Asiri ₄ , Baozhan Zheng ₂ , Xuping Sun _{1,

2}

Affiliation

The development of efficient earth-abundant electrocatalysts for N₂ reduction to ammonia (NH₃) under ambient conditions is critical for achieving a low-carbon and sustainable-energy society. Herein, we report the development of VN nanosheet array on Ti mesh as an active and selective electrocatalyst for N₂ reduction reaction (NRR) in acid at room temperature and atmospheric pressure in 0.1 M HCl. A rate of NH₃ formation of 8.40 × 10^–11 mol s^–1 cm^–2 is obtained at −0.50 V with a Faradaic efficiency of 2.25%. Notably, such catalyst material also exhibits high selectivity (no formation of N₂H₄) and electrochemical stability. Theoretical and experiment results suggest that VN catalyzes NRR via a Mars–van Krevelen mechanism. This study would offers the potential of utilization of attractive 3D catalyst electrode toward efficient NH₃ synthesis for applications.

中文翻译：

VN纳米片阵列在环境条件下高效选择性高效合成氨

对于在环境条件下将N ₂还原为氨（NH ₃）的高效富含地球的电催化剂的开发对于实现低碳和可持续能源社会至关重要。在本文中，我们报道了在Ti网上VN纳米片阵列的发展，该活性是在室温和大气压下于0.1 M HCl中的N ₂还原反应（NRR）在酸中的活性和选择性电催化剂。在-0.50 V时，法拉第效率为2.25％，可形成8.40×10 ^–11 mol s ^–1 cm ^–2的NH ₃。明显地，这种催化剂材料还表现出高选择性（不形成N ₂ H _4）。）和电化学稳定性。理论和实验结果表明，VN通过Mars-van Krevelen机制催化NRR。这项研究将提供诱人的3D催化剂电极在应用中实现高效NH ₃合成的潜力。

更新日期：2018-07-13

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