4 years ago

Engineering Reaction Kinetics by Tailoring the Metal Tips of Metal–Semiconductor Nanodumbbells

Engineering Reaction Kinetics by Tailoring the Metal Tips of Metal–Semiconductor Nanodumbbells
Ki Min Nam, Hyunjoon Song, Seon Joo Lee, Dahyi Jeong, Sang Kyu Kim, Dong-gu Kang, Ji Yong Choi
Semiconductor–metal hybrid nanostructures are one of the best model catalysts for understanding photocatalytic hydrogen generation. To investigate the optimal structure of metal cocatalysts, metal–CdSe–metal nanodumbbells were synthesized with three distinct sets of metal tips, Pt–CdSe–Pt, Au–CdSe–Au, and Au–CdSe–Pt. Photoelectrochemical responses and transient absorption spectra showed that the competition between the charge recombination at the metal–CdSe interface and the water reduction on the metal surface is a detrimental factor for the apparent hydrogen evolution rate. For instance, a large recombination rate (krec) at the Pt–CdSe interface limits the quantum yield of hydrogen generation despite a superior water reduction rate (kWR) on the Pt surface. To suppress the recombination process, Pt was selectively deposited onto the Au tips of Au–CdSe–Au nanodumbbells in which the krec was diminished at the Au–CdSe interface, and the large kWR was maintained on the Pt surface. As a result, the optimal structure of the Pt-coated Au–CdSe–Au nanodumbbells reached a quantum yield of 4.84%. These findings successfully demonstrate that the rational design of a metal cocatalyst and metal–semiconductor interface can additionally enhance the catalytic performance of the photochemical hydrogen generation reactions.

Publisher URL: http://dx.doi.org/10.1021/acs.nanolett.7b02582

DOI: 10.1021/acs.nanolett.7b02582

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.