Hydrogen Peroxide Production in the Oxygen Reduction Reaction at Different Electrocatalysts as Quantified by Scanning Electrochemical Microscopy
- 2 September 2009
- journal article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 81 (19), 8094-8100
- https://doi.org/10.1021/ac901291v
Abstract
We present data for H2O2 production at eight different materials tested as electrocatalysts for the oxygen reduction reaction (ORR) in 0.5 M H2SO4 (Hg, Au, Ag, Cu, Pt, Pd, Pd80Co20, and Au60Cu40) using scanning electrochemical microscopy (SECM) as an alternative to the widely used rotating ring-disk electrode (RRDE) method. The amount of H2O2 is related to the total number of electrons, n, found in the O2 reduction reaction, with n = 2 showing only H2O2 production and n = 4 showing no H2O2 formation. From the SECM study Hg shows n close to 2, whereas Pt and Pd80Co20 show n-values near 4. The other materials show intermediate n-values as a function of potential.This publication has 21 references indexed in Scilit:
- Methanol Tolerance of Pd–Co Oxygen Reduction Reaction Electrocatalysts Using Scanning Electrochemical MicroscopyElectrochemical and Solid-State Letters, 2008
- Scientific Aspects of Polymer Electrolyte Fuel Cell Durability and DegradationChemical Reviews, 2007
- Trends in electrocatalysis on extended and nanoscale Pt-bimetallic alloy surfacesNature Materials, 2007
- A class of non-precious metal composite catalysts for fuel cellsNature, 2006
- Rapid Screening of Bimetallic Electrocatalysts for Oxygen Reduction in Acidic Media by Scanning Electrochemical MicroscopyJournal of the Electrochemical Society, 2006
- Recent development of non-platinum catalysts for oxygen reduction reactionJournal of Power Sources, 2005
- Thermodynamic Guidelines for the Design of Bimetallic Catalysts for Oxygen Electroreduction and Rapid Screening by Scanning Electrochemical Microscopy. M−Co (M: Pd, Ag, Au)Journal of the American Chemical Society, 2004
- Construction and Reactivity Mapping of a Platinum Catalyst Gradient Using the Scanning Electrochemical MicroscopeLangmuir, 2001
- Imaging the Reactivity of Electro-oxidation Catalysts with the Scanning Electrochemical MicroscopeJournal of the Electrochemical Society, 2000
- Electrocatalysts for O2 reductionElectrochimica Acta, 1984