A Multi-electrode Electrochemical and Scanning Differential Electrochemical Mass Spectrometry Study of Methanol Oxidation on Electrodeposited PtxRuy

dc.contributor.author Jambunathan, K.
dc.contributor.author Jayaraman, S.
dc.contributor.author Hillier, Andrew
dc.contributor.department Chemical and Biological Engineering
dc.date 2018-02-14T01:23:19.000
dc.date.accessioned 2020-06-30T01:07:51Z
dc.date.available 2020-06-30T01:07:51Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2004
dc.date.embargo 2014-05-23
dc.date.issued 2004-01-01
dc.description.abstract <p>Methanol electro-oxidation was studied on a series of electrodeposited Pt<em><sub>x</sub></em>Ru<em><sub>y</sub></em> catalysts constructed as multielement band electrodes. A combination of electrochemical and scanning differential electrochemical mass spectrometry measurements were performed to evaluate the composition-dependence of methanol oxidation, methanol decomposition, CO<sub>2</sub> current efficiency, and the product distribution at 25 and 50 °C. At 25 °C, cyclic voltammetry revealed that the presence of Ru led to enhanced methanol oxidation rates over that of pure Pt. Methanol decomposition showed a similar composition-dependence. Mass spectrometry measurements revealed the evolution of HCOOH and CO<sub>2</sub> during methanol oxidation and allowed indirect determination of H<sub>2</sub>CO produced. Notably, these products were not observed during methanol decomposition. The most active electrode compositions and the highest instantaneous current efficiencies for the formation of CO<sub>2</sub> were found to depend on several factors. At 25 °C, the maximum activity was 10% Ru, while at 50 °C the most active composition increased to 25% Ru. Pure Pt had the highest instantaneous current efficiency for CO<sub>2</sub> at both temperatures. The product distribution reflected high CO<sub>2</sub> evolution for Pt, with an increasing fraction of the product emerging as H<sub>2</sub>CO at higher Ru content. Increasing the temperature improved the CO<sub>2</sub> current efficiency for all electrode compositions. These results confirm that methanol oxidation occurs though a parallel reaction pathway on Pt<em><sub>x</sub></em>Ru<em><sub>y</sub></em> electrodes. In addition, the balance between the different reaction pathways depends on several factors, including Ru composition and temperature.</p>
dc.description.comments <p>This article is from <em>Langmuir</em>20 (2004): 1856-1863, doi: <a href="http://dx.doi.org/10.1021/la035567i">10.1021/la035567i</a>. Posted with permission.</p>
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dc.identifier archive/lib.dr.iastate.edu/cbe_pubs/128/
dc.identifier.articleid 1123
dc.identifier.contextkey 5618417
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath cbe_pubs/128
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/13216
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/cbe_pubs/128/0-2004_HillierAC_AMultielectrodeElectrochemical.htm|||Fri Jan 14 19:30:03 UTC 2022
dc.source.bitstream archive/lib.dr.iastate.edu/cbe_pubs/128/2004_HillierAC_AMultielectrodeElectrochemical.pdf|||Fri Jan 14 19:30:05 UTC 2022
dc.source.uri 10.1021/la035567i
dc.subject.disciplines Chemical Engineering
dc.subject.disciplines Chemistry
dc.subject.keywords Institute for Combinatorial Discovery
dc.title A Multi-electrode Electrochemical and Scanning Differential Electrochemical Mass Spectrometry Study of Methanol Oxidation on Electrodeposited PtxRuy
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication d03ecc8c-ba57-4236-81ca-e4d2bdbb50f4
relation.isOrgUnitOfPublication 86545861-382c-4c15-8c52-eb8e9afe6b75
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