Journal
APPLIED SURFACE SCIENCE
Volume 567, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.150680
Keywords
Oxygen reduction reaction; Nitrogen reduction reaction; Strong metal-support interactions; Pd-Co alloy; Density functional theory; TiO2-Vo
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Funding
- National Natural Science Foundation of China [21625604, 21706229, 21878272, 91934302]
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Through preparation of Pd-Co nanoalloys on TiO2 supported with oxygen vacancies, researchers achieved high efficiency for oxygen reduction and nitrogen reduction reactions. The synergistic effect between Pd-Co alloys and Vo greatly enhanced the yield of NH3 and Faradaic efficiency.
Small molecules are converted into high-value products through electrochemical methods, which are considered as potential substitutes for traditional industrial methods. To reduce the use of precious metal and modulate the local environment by oxygen vacancies, Pd-Co nanoalloys supported on TiO2 with oxygen vacancies (Vo) are prepared through a facile pyrolysis approach. The superior ORR performance is obtained comparing to the commercial Pt/C (20 wt%) catalysts in alkaline solution. Moreover, the catalyst has amazing catalytic activity for NRR. The synergistic effect of Pd-Co alloys and the Vo greatly improves the yield of NH3 (4.11 mu g/(h.cm2)) and the Faradaic efficiency (2.83%). The performance of small molecular reduction is enhanced by the strong metalsupport interactions (SMSI), which agree with the density functional theory (DFT) calculations results. It is anticipated that the established nanoalloy electrocatalysts with modulation of metal-support interactions provide guidance for designing heterogeneous electrocatalysts with high efficiency.
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