无金属电催化剂实现高效 N-NH 固定。

High-performance N-to-NH fixation by a metal-free electrocatalyst.

机构信息

Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, Shandong, China.

出版信息

Nanoscale. 2019 Mar 7;11(10):4231-4235. doi: 10.1039/c8nr10401h.

DOI:10.1039/c8nr10401h

PMID:30809607

Abstract

The Haber-Bosch process for the synthesis of ammonia (NH3) not only causes large energy consumption but also leads to CO2 emissions. Electrocatalytic hydrogenation of N2 to NH3 under ambient conditions is a highly desirable alternative method; however, it needs an efficient electrocatalyst. In this study, we report a mesoporous boron nitride (MBN) metal-free electrocatalyst for the N2 reduction reaction under ambient conditions. Owing to its mesoporous structure, this MBN electrocatalyst can expose more active sites, resulting in an outstanding NH3 formation rate of 18.2 μg h-1 mgcat.-1 with a faradaic efficiency of 5.5% at -0.7 V vs. reversible hydrogen electrode in 0.1 M Na2SO4. It also demonstrates strong long-term electrochemical durability.

摘要

氨（NH3）的哈伯-博世合成工艺不仅消耗大量能源，还会导致二氧化碳排放。在环境条件下用电催化氢化氮气合成氨是一种非常理想的替代方法，但需要高效的电催化剂。在这项研究中，我们报告了一种用于环境条件下氮气还原反应的介孔氮化硼（MBN）无金属电催化剂。由于其介孔结构，这种 MBN 电催化剂可以暴露更多的活性位点，从而在 0.1 M Na2SO4 中-0.7 V 对可逆氢电极时以 18.2 μg h-1 mgcat.-1 的氨形成速率和 5.5%的法拉第效率表现出出色的 NH3 形成速率。它还表现出很强的长期电化学耐久性。