Cocatalyzing Pt/PtO Phase-Junction Nanodots on Hierarchically Porous TiO2 for Highly Enhanced Photocatalytic Hydrogen Production

Xiao Ning Ren, Zhi Yi Hu, Jun Jin, Liang Wu, Chao Wang, Jing Liu, Fu Liu, Min Wu, Yu Li, Gustaaf Van Tendeloo, Bao Lian Su

Research output: Contribution to journalArticlepeer-review

Abstract

Phase-junctions between a cocatalyst and its semiconductor host are quite effective to enhance the photocatalytic activity and are widely studied, while reports on the phase-juncted cocatalyst are still rare. In this work, we report the deposition of the Pt/PtO phase-juncted nanodots as cocatalyst via NaOH modification of an interconnected meso-macroporous TiO2 network with high surface area and inner-particle mesopores to enhance the performance of photocatalytic H2 production. Our results show that NaOH modification can largely influence Pt/PtO phase-juncted nanodot formation and dispersity. Compared to the TiO2 nanoparticles, the hierarchically meso-macroporous TiO2 network containing 0.18 wt % Pt/PtO phase-juncted cocatalyst demonstrates a highest photocatalytic H2 rate of 13 mmol g-1 h-1 under simulated solar light, and possesses a stable cycling activity without obvious decrease after five cycles. Such high H2 production performance can be attributed to both the phase-juncted Pt/PtO providing more active sites while PtO suppresses the undesirable hydrogen back reaction, and the special hierarchically porous TiO2 network with inner-particle mesopores presenting short diffusion path lengths for photogenerated electrons and enhanced light harvesting efficiency. This work suggests that Pt/PtO phase-juncted cocatalyst on hierarchically porous TiO2 nanostructures is a promising strategy for advanced photocatalytic H2 production.

Original languageEnglish
Pages (from-to)29687-29698
Number of pages12
JournalACS Applied Materials and Interfaces
Volume9
Issue number35
DOIs
Publication statusPublished - 6 Sep 2017

Keywords

  • biomolecular self-assembly
  • cocatalyst
  • hierarchically meso-macroporous TiO
  • photocatalytic H production
  • Pt/PtO phase-junction nanodots

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