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Photocatalytic overall water splitting on Pt nanocluster-intercalated, restacked KCa2Nb3O10 nanosheets: the promotional effect of co-existing ions.

ABSTRACT: Promotional effects of co-existing ions on overall water splitting into H2 and O2 have been studied in bulk-type semiconductor photocatalysts (e.g., TiO2), but such an effect remains unexplored in two-dimensional nanosheet photocatalysts. Here we examined the effect of co-existing ions on the photocatalytic water splitting activity of Pt nanocluster-intercalated KCa2Nb3O10 nanosheets. Interestingly, not only anions, as usually observed in bulk-type photocatalysts, but also cations had a significant influence on the photocatalytic performance. The rates of H2 and O2 evolution over Pt/KCa2Nb3O10 as well as the product stoichiometry were improved in the presence of NaI. I- ions were found to effectively suppress undesirable backward reactions, consistent with the previous work by Abe et al. (Chem. Phys. Lett., 2003, 371, 360-364). On the other hand, Na+ ions in the reaction solution were exchanged for K+ in the interlayer space of KCa2Nb3O10 during the water splitting reaction, which promoted interlayer hydration and consequently improved photocatalytic performance.

SUBMITTER: Oshima T 

PROVIDER: S-EPMC9473224 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature

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Photocatalytic overall water splitting on Pt nanocluster-intercalated, restacked KCa<sub>2</sub>Nb<sub>3</sub>O<sub>10</sub> nanosheets: the promotional effect of co-existing ions.

Oshima Takayoshi T   Wang Yunan Y   Lu Daling D   Yokoi Toshiyuki T   Maeda Kazuhiko K  

Nanoscale advances 20181203 1

Promotional effects of co-existing ions on overall water splitting into H<sub>2</sub> and O<sub>2</sub> have been studied in bulk-type semiconductor photocatalysts (<i>e.g.</i>, TiO<sub>2</sub>), but such an effect remains unexplored in two-dimensional nanosheet photocatalysts. Here we examined the effect of co-existing ions on the photocatalytic water splitting activity of Pt nanocluster-intercalated KCa<sub>2</sub>Nb<sub>3</sub>O<sub>10</sub> nanosheets. Interestingly, not only anions, as usua  ...[more]

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