3 years ago

Active Site Elucidation and Optimization in Pt Co-catalysts for Photocatalytic Hydrogen Production over Titania

Active Site Elucidation and Optimization in Pt Co-catalysts for Photocatalytic Hydrogen Production over Titania
Adam F. Lee, Zheng Wen Huang, Yifeng Deng, Zhi Jiang, Mark A. Isaacs, Wenfeng Shangguan
Platinum co-catalysts play a critical role in promoting the photocatalytic performance of inorganic semiconductors, yet despite intensive investigation, the active platinum species responsible remains controversial. Here, the physicochemical properties of Pt nanoparticles introduced into anatase titania through three different synthetic protocols are investigated by porosimetry, XRD, X-ray photoelectron spectroscopy (XPS), and X-ray absorption spectroscopy (XAS) and correlated with their corresponding activity for aqueous photocatalytic hydrogen production. Conventional wet impregnation produces small but highly oxidized platinum nanoparticles owing to the classical strong metal–support interaction with titania during high-temperature processing. Photodeposition yields predominantly metallic but large and inhomogeneous (1.5–7.5 nm) Pt nanoparticles. In contrast, a modified in situ polyol route affords metallic and highly dispersed (<2 nm) nanoparticles with minimal PtOx. Photocatalytic H2 evolution is directly proportional to the surface concentration of Pt metal, conclusively demonstrating metallic platinum as the active co-catalyst, and offering a simple parameter to quantitatively predict the photocatalytic performance of Pt/TiO2 in H2 production. The modified in situ polyol synthesis is optimal for co-catalyst formation, delivering rate enhancements of 25–80 % compared with the other syntheses. Finding the active component: The physicochemical properties of Pt nanoparticles introduced into anatase titania are investigated to find the active co-catalyst. Photocatalytic H2 evolution is directly proportional to the surface concentration of Pt metal, conclusively demonstrating metallic platinum as the active co-catalyst, and offering a simple parameter to quantitatively predict the photocatalytic performance of Pt/TiO2 in H2 production.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cctc.201700901

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.