二氧化锰纳米立方体：一种用于人工固氮制氨的高效电催化剂。

Mn O Nanocube: An Efficient Electrocatalyst Toward Artificial N Fixation to NH.

作者信息

Wu Xiufeng, Xia Li, Wang Yuan, Lu Wenbo, Liu Qian, Shi Xifeng, Sun Xuping

机构信息

Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Linfen, 041004, Shanxi, China.

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, Sichuan, China.

出版信息

Small. 2018 Nov;14(48):e1803111. doi: 10.1002/smll.201803111. Epub 2018 Oct 17.

DOI:10.1002/smll.201803111

PMID:30334346

Abstract

Traditionally, ammonia (NH ) is synthesized via the Haber-Bosch process, which is not only commanded by harsh conditions but causes serious environmental pollution. Electrochemical reduction is recognized as a mild and environmentally benign alternative approach for NH synthesis, but an efficient electrocatalyst is a prerequisite for NH production. In this communication, the first experimental demonstration that Mn O nanocubes can be used as an efficient non-noble-metal electrocatalyst for N reduction reaction (NRR) at ambient conditions is reported. In 0.1 m Na SO aqueous solution, the catalyst delivers excellent NRR activity with an NH yield of 11.6 µg h mg and Faradaic efficiency of 3.0% at -0.8 V versus reversible hydrogen electrode. Notably, this catalyst also possesses satisfactory durability during the electrolysis and recycling test.

摘要

传统上，氨（NH₃）是通过哈伯-博施法合成的，该方法不仅需要苛刻的条件，而且会造成严重的环境污染。电化学还原被认为是一种温和且环境友好的氨合成替代方法，但高效的电催化剂是氨生产的先决条件。在本通讯中，报道了首个实验证明，即MnO₂纳米立方体可在环境条件下用作高效的非贵金属电催化剂用于氮还原反应（NRR）。在0.1 m Na₂SO₄水溶液中，该催化剂在相对于可逆氢电极-0.8 V时具有出色的NRR活性，氨产率为11.6 µg h⁻¹ mg⁻¹，法拉第效率为3.0%。值得注意的是，该催化剂在电解和循环测试中也具有令人满意的耐久性。