Investigations of the anodic oxidation of ethanol under forced convection and ambient conditions

Jan O. Meier, Carsten Cremers, Ulrich Stimming, Jens Tübke

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

The electro-oxidation of ethanol was investigated in alkaline solution (0.5 M ethanol and 0.1 M NaOH) on a polycrystalline platinum electrode. The electrode was positioned in a flow channel (channel electrode) which ensures controllable and defined convection conditions in the electrode surrounding. Moreover, a flow through UV-Vis absorbance cell was used for intermediate (acetaldehyde) detection and its quantification. It was experimentally observed that the intermediate current efficiency is a function of flow rate. Furthermore, the intermediate current efficiency increases with increasing surface poisoning during ethanol oxidation. From the experimental results it can be estimated that the intrinsic current efficiency for the pathway to acetaldehyde is at least 73(3)%. Hence, the current efficiency for pathways leading directly via surface reactions to other reaction products is at most 27(3)% (both are integral values over 15 min of oxidation at 0.6 V vs. RHE).

Original languageEnglish
Title of host publicationPolymer Electrolyte Fuel Cells 12, PEFC 2012
PublisherElectrochemical Society Inc.
Pages2019-2030
Number of pages12
Edition2
ISBN (Print)9781607683506
DOIs
StatePublished - 2013
Event12th Polymer Electrolyte Fuel Cell Symposium, PEFC 2012 - 222nd ECS Meeting - Honolulu, HI, United States
Duration: 7 Oct 201212 Oct 2012

Publication series

NameECS Transactions
Number2
Volume50
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

Conference12th Polymer Electrolyte Fuel Cell Symposium, PEFC 2012 - 222nd ECS Meeting
Country/TerritoryUnited States
CityHonolulu, HI
Period7/10/1212/10/12

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