Issue 1, 2019

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
25 Sep 2018
Accepted
03 Dec 2018
First published
03 Dec 2018
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2019,1, 189-194

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

T. Oshima, Y. Wang, D. Lu, T. Yokoi and K. Maeda, Nanoscale Adv., 2019, 1, 189 DOI: 10.1039/C8NA00240A

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