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Enhanced photocatalytic hydrogen production from formic acid with reversible electron transfers in PdO/TiO 2

Fuel, ISSN: 0016-2361, Vol: 362, Page: 130865
2024
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A prepared p-type PdO/n-type TiO 2 junction was prepared as the catalyst for photocatalytic hydrogen evolution from formic acid (FA). It was found that PdO/TiO 2 exhibited 1298-fold higher activity than TiO 2 under ultraviolet and visible light irradiation at room temperature. Multiple characterization techniques were utilized to demonstrate that doping PdO into TiO 2 can regulate the Fermi level of the sample and the adsorption behavior of FA, resulting in different electron transfer behavior between FA and PdO/TiO 2 compared to that between FA and TiO 2. Oxygen vacancies acted as electron donors to deliver photogenerated electrons from TiO 2 to the adsorbed bidentate FA, which increased the electron density on the O atom of FA and led to the formation of activated monodentate FA. This activated FA was more easily oxidized by the holes in PdO generated by visible light, leading to the production of H 2 and CO 2. The mode of adsorption associated with the Pd 2+ site is the key factor in driving this reaction and leading to the reversible electron transfer phenomenon. This study provides a new promising route for the design of photocatalysts for self-decomposition reactions.

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