3 years ago

Engineered architecture of nitrogenous graphene encapsulating porous carbon with nano-channel reactors enhancing the PEM fuel cell performance

Engineered architecture of nitrogenous graphene encapsulating porous carbon with nano-channel reactors enhancing the PEM fuel cell performance
Nanoscale architecturing of platinum group metal-free (PGM-free) electrocatalysts is expected to dramatically improve the overall catalytic performance for oxygen reduction reaction (ORR). Desired structures and morphologies for boosting active site density and enhancing mass and charge transfer are essential for developing next-generation PGM-free electrocatalysts. Herein, we report the design of a M-N-C type catalyst consisting of 3-dimensional graphitic meso-porous carbon spheres wrapped with 2-dimensional graphenized sheets. This heterostructure comprises resultant large electroactive surface area, abundant pore channels, and tuned chemical structures, which provide improved electrocatalytic performance. Meanwhile, these pore structures can be regarded as nano-channel reactors to catalyze ORR with easily accessible active sites, effective mass transfer, and smooth charge transfer. The obtained catalyst delivers a high maximum power density of 0.83Wcm−2 in a single H2–O2 fuel cell measurement, ranking it as one of the most promising PGM-free catalysts in proton exchange membrane fuel cells (PEMFCs). Moreover, reasonable fuel cell stability was also observed through accelerated degradation testing. This work provides a new avenue for PGM-free catalysts design that can be a step towards practical commercial of PEMFCs.

Publisher URL: www.sciencedirect.com/science

DOI: S2211285517306560

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.