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Rational Construction of Heterostructured Cu3P@TiO2 Nanoarray for High-Efficiency Electrochemical Nitrite Reduction to Ammonia |
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| Authors: | Zhengwei Cai Donglin Zhao Xiaoya Fan Longcheng Zhang Jie Liang Zixiao Li Jun Li Yongsong Luo Dongdong Zheng Yan Wang Tingshuai Li Hong Yan Binwu Ying Shengjun Sun Abdulmohsen Ali Alshehri Hong Yan Jia Xu Qingquan Kong Xuping Sun |
| Affiliation: | 1. Key Laboratory of Marine Chemistry Theory and Technology (Ministry of Education), College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, Shandong, 266100 China
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong, 250014 China;2. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610054 China;3. College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong, 250014 China;4. Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589 Saudi Arabia;5. Laboratory Medicine Center, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210011 China;6. Key Laboratory of Marine Chemistry Theory and Technology (Ministry of Education), College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, Shandong, 266100 China;7. Interdisciplinary Materials Research Center, Institute for Advanced Study, Chengdu University, Chengdu, Sichuan, 610106 China |
| Abstract: | Electroreduction of nitrite (NO2?) to valuable ammonia (NH3) offers a sustainable and green approach for NH3 synthesis. Here, a Cu3P@TiO2 heterostructure is rationally constructed as an active catalyst for selective NO2?-to-NH3 electroreduction, with rich nanosized Cu3P anchored on a TiO2 nanoribbon array on Ti plate (Cu3P@TiO2/TP). When performed in the 0.1 m NaOH with 0.1 m NaNO2, the Cu3P@TiO2/TP electrode obtains a large NH3 yield of 1583.4 µmol h?1 cm?2 and a high Faradaic efficiency of 97.1%. More importantly, Cu3P@TiO2/TP also delivers remarkable long-term stability for 50 h electrolysis. Theoretical calculations indicate that intermediate adsorption/conversion processes on Cu3P@TiO2 interfaces are synergistically optimized, substantially facilitating the conversion of NO2?-to-NH3. |
| Keywords: | ammonia synthesis Cu3P@TiO2 nanoarrays electrochemical nitrite reduction heterostructures theoretical calculations |