Tailoring the Porosity in Iron Phosphosulfide Nanosheets to Improve the Performance of Photocatalytic Hydrogen Evolution.
ChemSusChem
; 12(12): 2651-2659, 2019 Jun 21.
Article
em En
| MEDLINE
| ID: mdl-30972932
ABSTRACT
Metal sulfide photocatalysts are typically required during water splitting to produce hydrogen. However, the rapid recombination of photogenerated electron-hole pairs in these highly unstable photocatalysts has restricted hydrogen production to small-scale batch reactions. In this work, porous transition-metal thiophosphites were used to enable continuous long-term hydrogen production through photocatalysis. A wide bandgap (2.04â
eV) was essential for generating hydrogen at a rate of 305.6â
µmol h-1 g-1 , 180 % faster than nonporous FePS3 nanosheets. More importantly, the high in-plane stiffness of these approximately 7â
nm thick porous FePS3 nanosheets ensured structural stability during 56â
h of continuous photocatalysis reactions. The reaction results with D2 O instead of H2 O indicated that hydrogen mainly came from H2 O. Furthermore, a sacrificial reagent (triethylamine) was photodegraded into diethylamine and acetaldehyde through a monoelectronic oxidation process, as indicated by HPLC and LC-MS. This synthesis strategy reported for FePS3 porous nanosheets paves a new pathway for designing other dianion-based inorganic nanocrystals for hydrogen energy applications.
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MEDLINE
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En
Ano de publicação:
2019
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Article