Journal
CHINESE JOURNAL OF CATALYSIS
Volume 42, Issue 10, Pages 1755-1762Publisher
ELSEVIER
DOI: 10.1016/S1872-2067(21)63795-6
Keywords
La doping; Electrocatalytic N-2 reduction; Oxygen vacancy; TiO2; Density functional theory
Funding
- National Natural Science Foundation of China [22072015]
- Shanghai Scientific and Technological Innovation Project [18JC1410604]
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The development of La-doped TiO2 nanorods as an efficient NRR electrocatalyst for ambient NH3 synthesis has resulted in high NH3 yield and Faradaic efficiency, outperforming previous La- and Ti-based catalysts.
Electrochemical N-2 reduction provides a green and sustainable alternative to the Haber-Bosch technology for NH3 synthesis. However, the extreme inertness of N-2 molecules is a formidable challenge, which requires the development of an active electrocatalyst to drive the N-2 reduction reaction (NRR) for NH3 production at ambient conditions. Herein, we demonstrate the development of La-doped TiO2 nanorods as an efficient NRR electrocatalyst for ambient NH3 synthesis. The optimized La-TiO2 catalyst offers a large NH3 yield of 23.06 mu g h(-1) mg(cat)(-1) and a high Faradaic efficiency of 14.54% at.0.70 V versus reversible hydrogen electrode in 0.1 M LiClO4, outperforming most La- and Ti-based catalysts reported before. Significantly, it also demonstrates high electrochemical stability and its activity decay is negligible after 48 h test. The mechanism is further revealed by density functional theory calculations. (C) 2021, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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