Journal
ACS CATALYSIS
Volume 11, Issue 11, Pages 6484-6488Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c01734
Keywords
controlled periodic illumination; hydrogen evolution reaction; titanium dioxide; photoreforming; volcano plot; sabatier; surface catalytic resonance
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Funding
- University of Torino
- EMPIR programme [17NRM04]
- European Union's Horizon 2020 research and innovation programme
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Periodic illumination of a Pt/TiO2 suspension can induce catalytic surface resonance on the metal, leading to an increase in solar water splitting efficiency.
Efficient solar water photosplitting is plagued by large over-potentials of the HER and OER. Even with a noble metal catalyst, the hydrogen evolution reaction can be limited by the strong M-H bonding over some metals, such as Pt, Pd, and Rh, inhibiting hydrogen desorption. H absorption is regulated by the potential at the metal nanoparticles. Through controlled periodic illumination of a Pt/TiO2 suspension, we hypothesized a fast variation of the photopotential that induced catalytic surface resonance on the metal, resulting in more than a 50% increase of the efficiency at frequencies higher than 80 Hz.
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