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Durable Electrocatalytic Reduction of Nitrate to Ammonia over Defective Pseudobrookite Fe2TiO5 Nanofibers with Abundant Oxygen Vacancies |
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| Authors: | Hongting Du Haoran Guo Kaike Wang Xiangning Du Bayu Admasu Beshiwork Shengjun Sun Yongsong Luo Dr Qian Liu Prof Tingshuai Li Prof Xuping Sun |
| Institution: | 1. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731 Sichuan, China
These authors contributed equally to this work.;2. School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049 China These authors contributed equally to this work.;3. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731 Sichuan, China;4. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054 Sichuan, China;5. Institute for Advanced Study, Chengdu University, Chengdu, 610106 Sichuan, China;6. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054 Sichuan, China College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014 Shandong, China |
| Abstract: | We propose the pseudobrookite Fe2TiO5 nanofiber with abundant oxygen vacancies as a new electrocatalyst to ambiently reduce nitrate to ammonia. Such catalyst achieves a large NH3 yield of 0.73 mmol h−1 mg−1cat. and a high Faradaic Efficiency (FE) of 87.6 % in phosphate buffer saline solution with 0.1 M NaNO3, which is lifted to 1.36 mmol h−1 mg−1cat. and 96.06 % at −0.9 V vs. RHE for nitrite conversion to ammonia in 0.1 M NaNO2. It also shows excellent electrochemical durability and structural stability. Theoretical calculation reveals the enhanced conductivity of this catalyst and an extremely low free energy of −0.28 eV for nitrate adsorption at the presence of vacant oxygen. |
| Keywords: | Ammonia Synthesis Catalytic Reduction of Nitrate Density Functional Theory Oxygen Vacancy Pseudobrookite |