Poisoning of PtRu/C Catalysts in the Anode of a Direct Methanol Fuel Cell: A DEMS study | Sciact - CRIS-система Института катализа

Poisoning of PtRu/C Catalysts in the Anode of a Direct Methanol Fuel Cell: A DEMS study Научная публикация

Журнал

Electrochimica Acta
ISSN: 0013-4686 , E-ISSN: 1873-3859

Вых. Данные

Год: 2004, Том: 49, Номер: 22-23, Страницы: 3927-3936 Страниц : 10 DOI: 10.1016/j.electacta.2004.01.081

Ключевые слова

Adsorbate coverage, Adsorption, DEMS, DMFC, Methanol, PtRu/C anode

Авторы

Seiler T. ¹ , Savinova E.R. ^1,2 , Friedrich K. ^1,3 , Stimming U. ¹

Организации

1	Physik Department E19, Technische Universität München, James-Franck Strasse, Garching bei München D-85748 Garching, Germany
2	Boreskov Institute of Catalysis of the Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva, 5, Novosibirsk 630090, Russian Federation
3	Center for Solar Energy and Hydrogen Research Baden-Würtenberg, Helmholtzstrasse 8, D-89081 Ulm, Germany

Информация о финансировании (2)

1	German Research Foundation	Sti 74-8-3
2	German Research Foundation	Sti 74-8-4

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.

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 CAPlusCA OpenAlex

Поступила в редакцию:	29 окт. 2003 г.
Принята к публикации:	4 янв. 2004 г.
Опубликована online:	2 июн. 2004 г.
Опубликована в печати:	15 сент. 2004 г.

Web of science:	WOS:000222818100034
Scopus:	2-s2.0-3042856509
РИНЦ:	13450801
Chemical Abstracts:	2004:553749
Chemical Abstracts (print):	141:245987
OpenAlex:	W2081487185

БД	Цитирований
Web of science	90
Scopus	94
РИНЦ	93
OpenAlex	97