Carbon-Based Hybrid Electrocatalyst with High Performance

  • Author: ChemistryViews.org
  • Published: 31 March 2020
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: ACS Catalysis/ACS Publications
  • Associated Societies: American Chemical Society (ACS), USA
thumbnail image: Carbon-Based Hybrid Electrocatalyst with High Performance

The oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are important for water splitting and in fuel cells. Good catalysts for these reactions are, thus, key for an environmentally friendly hydrogen economy. Often, such catalysts are based on expensive metals such as Pt, Ru, or Ir. Using doped carbon-based materials as catalysts could be a cost-effective alternative.


Mohammad Tavakkoli, Aalto University, Finland, and colleagues have developed a mesoporous graphene nanoflake (GF)/carbon nanotube (CNT) hybrid material doped with single atoms of N, Co, and Mo. The material was prepared via a one-step catalytic chemical vapor deposition method under a flow of H2 and CH4, using a powder of Mg0.99(Co1-xMox)0.01O (x ≈ 0.25) as the catalyst and acetonitrile as the nitrogen source.


The resulting hybrid material has a high electrocatalytic activity and stability for ORR and OER in alkaline solutions. The mesoporous structure improves the transfer of oxygen within the catalyst film and provides a large surface area. The team found that metal–carbon centers are the main active sites for the OER, while metal and nitrogen–carbon centers together act as active sites for the ORR. When the hybrid material is placed on a nickel support, the resulting catalyst has an even higher catalytic activity. According to the researchers, the Ni-supported catalyst has an electrocatalytic performance that is comparable to the best ORR/OER catalysts reported so far.


 

 

Article Views: 1028

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


Magazine of Chemistry Europe (16 European Chemical Societies)published by Wiley-VCH