期刊
NANO ENERGY
卷 95, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2022.107020
关键词
Piezoelectric effect; N-2 fixation; Zno; Oxygen vacancies
类别
资金
- National Natural Science Foundation of China [51809140, 61901271]
- Natural Science Foundation of Jiangsu Province [BK20180793]
- Zhejiang AF University [2021FR027]
- Jiangsu Government Scholarship for Overseas Studies
- Natural Science Foundation of Jiangsu Higher Education Institutions of China [17KJB430023]
- Priority Academic Program Development of the Jiangsu Higher Education Institutions (PAPD)
In this study, ZnO microrods and ZnO-Ag heterostructures were designed and exhibited high activity in ammonia production under ultrasound sonication. The size and morphology of ZnO, as well as oxygen vacancies, were found to greatly impact the reaction. Loading Ag NPs further enhanced the reaction activity.
Using mechanical waste energy to drive the ammonia production from N-2 and water under ambient conditions is of great significance yet still very challenging. In this work, we designed ZnO microrods and ZnO-Ag heterostructures that exhibited high activity, selectivity, and stability in the production of ammonia under ultrasound sonication. Combining the piezoelectric force microscopy (PFM), temperature programed desorption of N-2 (N-2-TPD), electron spin resonance (ESR), electrochemical analysis with finite element numerical simulation, we found that the size and morphology of ZnO greatly impacted the shape deformation as well as the piezoelectric potential across the material, while the oxygen vacancies were essential for the adsorption and activation of N-2. Loading Ag NPs onto ZnO could further enhance the N-2 fixation activity by generating local strain at the Ag-ZnO interface, enhancing the chemical adsorption of N-2, and facilitating the separation of piezo-generated electrons and holes. Our work demonstrates the design principles of highly active piezoelectric catalysts for N-2 fixation.
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