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室温下的电化学氮还原反应(NRR)为合成氨提供了一条温和的途径。然而,常温常压下电化学NRR的活性和选择性较差。过渡金属氧化物上的氧空位可以为N2分子的吸附和活化提供独特的活性位点。制备了一种氧空位Co_3O4(V-Co_3O4)纳米线阵列。喇曼光谱和X射线光电子能谱(XPS)测试显示氧空位可以稳定地存在于V-Co_3O4纳米线阵列上。电化学测试表明,V-Co_3O4具有高效的电化学氮还原反应活性和选择性。在工作电极上施加-0.3 V时,氨的产量高达10.9μg·h-1·cm-2,法拉第效率为6.3%。这种低成本的过渡金属氧化物是有前途的固氮催化剂之一。
Abstract：Electrochemical nitrogen reduction reaction(NRR) at room temperature provides a mild pathway for the synthesis of ammonia. However, the electrochemical NRR at normal temperature and pressure shows poor activity and selectivity. The oxygen vacancy on transition metal oxide can provide a unique active site for the adsorption and activation of N2 molecules. The nanowire arrays of Co_3O4 with oxygen vacancy(V-Co_3O4)were prepared. Raman spectrometry and X-ray photoelectron spectrum(XPS) tests show that the oxygen vacancy can stably exist on the V-Co_3O4 nanowire arrays. The electrochemical tests show that V-Co_3O4 has highly efficient activity and selectivity of electrochemical NRR. When-0.3 V is applied to the working electrode, the yield of ammonia is up to 10.9 μg·h-1·cm-2 and the Faraday efficiency is 6.3%. The low-cost transition metal oxide is one of the promising nitrogen-fixing catalysts.
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基本信息:
DOI：10.13250/j.cnki.wndz.2021.12.011
中图分类号:TQ113.2;TQ426;TB383.1
引用信息:
[1]曹茂启,吴大旺,向丁玎,等.氧空位Co_3O_4纳米线阵列的制备及其高效电催化合成氨[J].微纳电子技术,2021,58(12):1114-1120.DOI:10.13250/j.cnki.wndz.2021.12.011.
基金信息:
贵州省教育厅资助项目(黔教合KY字[2019]216,黔教合KY字[2020]206,黔教合KY字[2018]424,黔教合KY字[2015]342); 黔南民族师范学院基金项目(QNYSKYPT2018005)
2021-11-25
2021-11-25