Poisoning of PtRu/C Catalysts in the Anode of a Direct Methanol Fuel Cell: A DEMS study Full article
| Journal |
Electrochimica Acta
ISSN: 0013-4686 , E-ISSN: 1873-3859 |
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| Output data | Year: 2004, Volume: 49, Number: 22-23, Pages: 3927-3936 Pages count : 10 DOI: 10.1016/j.electacta.2004.01.081 | ||||||
| Tags | Adsorbate coverage, Adsorption, DEMS, DMFC, Methanol, PtRu/C anode | ||||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | German Research Foundation | Sti 74-8-3 |
| 2 | German Research Foundation | Sti 74-8-4 |
Abstract:
Poisoning of a commercial PtRu/C electrocatalyst with the products of methanol dehydrogenative adsorption has been studied in a membrane electrode assembly of a liquid fed direct methanol fuel cell at different electrode potentials in the temperature range between 30 and 110°C using a newly designed DEMS setup. In all cases COads is identified as the stable methanol dehydrogenation product. The adsorbate coverage versus the electrode potential follows a bell-shaped curve, reaching a maximum around 0.1/0.2V RHE. During methanol oxidation, the adsorbate coverage remains high and increases with temperature (θ ∼ 0.6 at 90°C in 1M methanol solution). Kinetics of methanol adsorption has been studied at the open circuit potential (between 0 and 20mV versus RHE). The coverage of the adsorbate and the rate of adsorption rise with temperature. The adsorption isotherms are of Temkin type with an adsorption rate constant kad increasing from 1.6 ± 0.1cm3mol-1s-1 at 30°C to 73 ± 11cm3mol-1s-1 at 110°C and a temperature-dependent inhomogeneity parameter αf ranging from 35 ± 1 at 30°C to 8.3 ± 0.2 at 110°C. The apparent activation energy of methanol adsorption at the OCP and zero coverage is estimated as ca. 45 ± 2kJmol-1.
Cite:
Seiler T.
, Savinova E.R.
, Friedrich K.
, Stimming U.
Poisoning of PtRu/C Catalysts in the Anode of a Direct Methanol Fuel Cell: A DEMS study
Electrochimica Acta. 2004. V.49. N22-23. P.3927-3936. DOI: 10.1016/j.electacta.2004.01.081 WOS Scopus РИНЦ ANCAN OpenAlex
Poisoning of PtRu/C Catalysts in the Anode of a Direct Methanol Fuel Cell: A DEMS study
Electrochimica Acta. 2004. V.49. N22-23. P.3927-3936. DOI: 10.1016/j.electacta.2004.01.081 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Oct 29, 2003 |
| Accepted: | Jan 4, 2004 |
| Published online: | Jun 2, 2004 |
| Published print: | Sep 15, 2004 |
Identifiers:
| Web of science: | WOS:000222818100034 |
| Scopus: | 2-s2.0-3042856509 |
| Elibrary: | 13450801 |
| Chemical Abstracts: | 2004:553749 |
| Chemical Abstracts (print): | 141:245987 |
| OpenAlex: | W2081487185 |