Ti2O3 Nanoparticles with Ti3+ Sites toward Efficient NH3 Electrosynthesis under Ambient Conditions
| Autor: | Qian Liu, Yang Liu, Zhaoquan Xu, Qingquan Kong, Zhe-sheng Feng, Yan Wang, Jie Liang, Baozhan Zheng, Abdullah M. Asiri, Li Li, Yonglan Luo, Xifeng Shi, Shuyan Gao, Haijun Chen, Xuping Sun |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | ACS Applied Materials & Interfaces. 13:41715-41722 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.1c11872 |
| Popis: | Electrocatalytic nitrogen reduction reaction (NRR) enabled by introducing Ti3+ defect sites into TiO2 through a doping strategy has recently attracted widespread attention. However, the amount of Ti3+ ions is limited due to the low concentration of dopants. Herein, we propose Ti2O3 nanoparticles as a pure Ti3+ system that performs efficiently toward NH3 electrosynthesis under ambient conditions. This work has suggested that Ti3+ ions, as the main catalytically active sites, significantly increase the NRR activity. In an acidic electrolyte, Ti2O3 achieves extraordinary performance with a high NH3 yield and a Faradaic efficiency of 26.01 μg h-1 mg-1 cat. and 9.16%, respectively, which are superior to most titanium-based NRR catalysts recently reported. Significantly, it also demonstrates a stable NH3 yield in five consecutive cycles. Theoretical calculations uncovered that the enhanced electrocatalytic activity of Ti2O3 originated from Ti3+ active sites and significantly lowered the overpotential of the potential-determining step. |
| Databáze: | OpenAIRE |
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