Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Formic Acid oxidation on platinum- a simple mechanistic study

Published

Author(s)

Kathleen A. Schwarz, Ravishankar Sundararaman, Thomas P. Moffat, Thomas C. Allison

Abstract

The oxidation of organic acids on noble metal sur-faces is of importance for industrial processes and of academic interest, but the basic reaction mechanisms continue to be a matter of debate. Historically, mechanisms involving the formic acid molecule have been proposed, but recently a theory has been advanced that formate is the key reactant on the metal surface. 1 Ab initio calculations of this reaction on a Pt(111)surface have been performed to explore this reaction and help resolve the debate. When a formate molecule approaches the platinum surface from above, with the H pointing down, it re-acts to form CO 2 and adsorbed H. Furthermore, this reaction is nearly barrierless at relevant voltages on a clean Pt surface, but high coverages of adsorbates lead to large reaction bar- riers. This mechanism explains the elusiveness of an active surface intermediate, and leads to a proposed rate equation on the pristine metal proportional to the formate concentration times the number of available platinum sites; in practice the availability of these sites appears to limit the reaction.
Citation
Journal of the American Chemical Society

Keywords

formic acid oxidation, Pt, fuel cell, electrocatalysis

Citation

Schwarz, K. , Sundararaman, R. , Moffat, T. and Allison, T. (2015), Formic Acid oxidation on platinum- a simple mechanistic study, Journal of the American Chemical Society (Accessed July 22, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created July 15, 2015, Updated June 2, 2021