4 years ago

Nitrogen-Doped Three-Dimensional Graphene-Supported Palladium Nanocomposites: High-Performance Cathode Catalysts for Oxygen Reduction Reactions

Nitrogen-Doped Three-Dimensional Graphene-Supported Palladium Nanocomposites: High-Performance Cathode Catalysts for Oxygen Reduction Reactions
Sadia Kabir, Plamen Atanassov, Kateryna Artyushkova, Alexey Serov
This study reports an effective strategy for fabricating three-dimensional nitrogen-doped graphene supports for palladium nanoparticles (Pd–N/3D-GNS) and studying the electrochemical activity of the synthesized nanocomposites toward oxygen electroreduction in alkaline media as well as implementing the nanocomposite as cathode catalysts in anion exchange membrane fuel cells (AEMFC). It was demonstrated that by embedding and etching an amorphous sacrificial silica template into the reduced graphene matrix, the as-prepared nanocomposites pyrolyzed into hierarchically porous 3D-nanosheets composed of interconnected nitrogen-doped graphene nanostacks, which was confirmed using transmission electron microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. Palladium nanoparticles were then deposited on the N/3D-GNS supports using a surfactant-free technique and characterized using various surface analysis and potentiodynamic techniques. By analyzing the linear sweep voltammograms obtained from rotating ring disc electrodes, it was demonstrated that the Pd–N/3D-Graphene nanocomposites efficiently catalyzed the four-electron reduction of oxygen, with onset potentials closer to theoretical values and negligible peroxide yields. The nanocomposites were then integrated into a catalyst-coated membrane and tested in H2/O2 fed AEMFC. Owing to its unique morphological features and the desirable chemical composition, the Pd/3D-GNS catalysts exhibited much enhanced performance as cathode materials for AEMFCs. The enhanced electrochemical kinetics and high current/power densities of up to 250 mW cm–2 obtained from the cathodes materials described in this study will lead to further advancements in AEMFC technology.

Publisher URL: http://dx.doi.org/10.1021/acscatal.7b02071

DOI: 10.1021/acscatal.7b02071

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.