Platinum Oxide Phases Affect Oxygen Evolution Performance

  • ChemPubSoc Europe Logo
  • Author: ChemPhysChem
  • Published Date: 07 May 2019
  • Source / Publisher: ChemPhysChem/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Platinum Oxide Phases Affect Oxygen Evolution Performance

Related Societies

The oxygen evolution reaction (OER) is the anode process in many electrolysis cells. It generally suffers from slow kinetics that limit the efficiency.


Matthias Arenz, University of Bern, Switzerland, and colleagues have studied the OER on Pt(111) and Pt(100) single-crystal model electrodes to understand fundamental structure-activity relationships. The team performed electrochemical experiments under conditions that partially maintain an ordered surface structure. They showed that  Pt(100)—despite its lower surface atomic density—produces about ten times more oxygen than Pt(111).


Density functional theory (DFT) calculations suggest that this difference is caused by the formation of 3D platinum oxide phases. With its open structure, Pt(100) cannot retain metastable oxygen in the subsurface. The more dense Pt(111) surface allows the formation of a Pt–O layer with reduced conductivity compared to metallic Pt. These results imply that the OER performance can be enhanced by engineering surface structures that prevent the formation of 3D oxide layers.


 

Article Views: 375

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


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH