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Xu S, Qin M, Qi J, Belfiore LA, Tang J. Co-Ni bimetallic oxide with tuned surface oxygen vacancies efficiently electrocatalytic reduction of nitrate to ammonia. J Colloid Interface Sci 2025; 679:598-606. [PMID: 39388946 DOI: 10.1016/j.jcis.2024.10.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2024] [Revised: 09/24/2024] [Accepted: 10/02/2024] [Indexed: 10/12/2024]
Abstract
The electrocatalytic reduction reaction of nitrate (NO3-) to ammonia (NH3) provides an efficient and clean NH3 production method, which has the potential to replace the traditional industrial preparation methods. However, the limited activity and Faraday efficiency (FE) of existing catalysts impede the practical application of this technology. Herein, in this work, a high-performance catalyst with high NH3 yield and FE was fabricated. Co-Ni bimetallic oxide (NiCo2O4) catalysts with tuned surface oxygen vacancies (OVs) contents were prepared by changing the heating rate during calcination, NiCo2O4 calcined at a heating rate of 5 °C/min (NiCo2O4-5) possessed the highest surface OVs content. Experimental studies showed that NiCo2O4 with higher surface OVs had better NO3RR activity, inhibited the production of nitrite (NO2-), and exhibited higher selectivity to NH3. Among prepared catalysts, NiCo2O4-5 demonstrated superior performance in electrocatalytic reduction of NO3- to NH3, achieving a high NH3 FE (94.4 %) and yield (193.2 mmol/h g-1) at a suitable applied voltage. Besides, in situ Fourier transform infrared spectroscopy analysis suggested that NiCo2O4-5 preferentially followed the NO3RR pathway as follows: *NO3 → *HNO3 → *NO2 → *HNO2 → *NO → *HNO → *N → *NH → *NH2 → *NH3.
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Affiliation(s)
- Shouheng Xu
- Institute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, PR China
| | - Meichun Qin
- Institute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, PR China.
| | - Jingqi Qi
- Institute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, PR China
| | - Laurence A Belfiore
- Institute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, PR China; Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, CO 80523, USA
| | - Jianguo Tang
- Institute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, PR China.
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Wei J, Guo J, Wang S, Ding N, Xu P, Wang P, Han D, Wei Y, Yin X. Fabrication of dual-functional electrodes using oxygen vacancy abundant NiCo 2O 4 nanosheets for advanced hybrid supercapacitors and Zn-ion batteries. Inorg Chem Front 2022. [DOI: 10.1039/d2qi00739h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
V-ZnCo2O4/Ni composites with rich oxygen vacancies are designed through a hydrothermal method followed by post calcination and reduction. This strategy enhanced electrical conductivity, modulated electronic structure, and increased active sites.
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Affiliation(s)
- Jinhe Wei
- College of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China
| | - Jiaqing Guo
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China
| | - Siyu Wang
- College of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China
| | - Ning Ding
- College of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China
| | - Pengcheng Xu
- College of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China
| | - Ping Wang
- College of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China
| | - Dandan Han
- College of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China
| | - Yen Wei
- Department of Chemistry and the Tsinghua Center for Frontier Polymer Research, Tsinghua University, Beijing, 100084, China
| | - Xiaohong Yin
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China
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