journal article·2021-09-08

Ti2O3 Nanoparticles with Ti3+ Sites toward Efficient NH3 Electrosynthesis under Ambient Conditions

Haijun Chen, Jie Liang, Li Li, Baozhan Zheng, Zhesheng Feng, Zhaoquan Xu, Yonglan Luo, Qian Liu, Xifeng Shi, Yang Liu, Shuyan Gao, Abdullah M. Asiri, Yan Wang, Qingquan Kong, Xuping Sun

ACS Applied Materials & Interfaces· Volume 13· Issue 35
Publisher page

Abstract

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.
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Research context

OpenAlex topics: Ammonia Synthesis and Nitrogen Reduction · Advanced Photocatalysis Techniques · Nanomaterials for catalytic reactions

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China

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

Institute for Advanced Study, Chengdu University, Chengdu, Sichuan 610106, China

College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong 250014, China

School of Materials Science and Engineering, Henan Normal University, Xinxiang, Henan 453007, China

Chemistry Department, Faculty of Science & Center of Excellence for Advanced Materials Research, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia

Funding

Department of Science and Technology of Sichuan Province · National Natural Science Foundation of China

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