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- Title
Enhanced mass transfer and optimized electronic structure on Pd–Ag nanoparticles embedded in mesoporous carbon for superior electro-oxidation.
- Authors
Chen, DePing; Li, Mengjue; Chen, Ying; Shao, Zhenyi; Wei, Yanhong; Xian, Yong; Liu, Xi Chuan; Ying, XianJun
- Abstract
The development of economically viable anode catalysts for the alcohol oxidation reaction (AOR) has been a long-standing challenge in direct alcohol fuel cells (DAFCs). A series of Pd–Ag nanoparticles embedded in mesoporous carbon were fabricated in this study using a green approach that did not require the use of a surfactant, which exhibited better catalytic properties for AOR. Experiments and DFT calculations reveal that the d-band center of Pd is influenced by both strain and ligand effects, with the ligand effect predominating. The electrochemical studies demonstrated that the composite-optimized Pd–Ag alloy at a Pd/Ag molar ratio of 1:1 was the highest in terms of ethanol oxidation (EOR) and ethylene glycol oxidation (EGOR) catalytic activity. The mass activities of Pd1Ag1/MC for EOR and EGOR were 7921 mA mg−1 and 11,520 mA mg−1, respectively, which were 3.77 and 5.3 fold greater than Pd/C. The impressive performance of Pd1Ag1/MC catalyst could be attributed to the vital roles of the unique mesoporous structure of carbon sphere with abundant self-doping defect and the boosting effect of Ag (benefit from optimized d-band electronic structure and bi-functional mechanism). The present simple method of synthesizing low-cost, easy-to-use, and high-performance catalysts contributes to the exploration of the large-scale practical applications of direct alkaline alcohol fuel cells.
- Subjects
ELECTROLYTIC oxidation; ELECTRONIC structure; ALKALINE fuel cells; ALCOHOL oxidation; ALCOHOL as fuel; MASS transfer; ETHYLENE glycol; SURFACE enhanced Raman effect
- Publication
Journal of Solid State Electrochemistry, 2023, Vol 27, Issue 10, p2737
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-023-05561-3