NDLI: Activity of selenium modified ruthenium-electrodes and determination of the real surface area

Content Provider	Springer Nature Link
Author	Bogolowski, Nicky Nagel, Tina Lava, Barbora Ernst, Siegfried Baltruschat, Helmut Nagabhushana, Kyatanahalli S. Boennemann, Helmut
Copyright Year	2007
Abstract	The determination of the surface area of Pt and Ru electrocatalyst surfaces by oxidation of adsorbed CO and by oxidation of a Cu upd layer are compared. The amount of adsorbed CO was determined mass-spectrometrically from the ionic current for CO$_{2}$ formation during an oxidative potential sweep. On Ru, the Faradaic charge is too large (by approx. 55%) due to Faradaic effects (oxygen adsorption). For massive Ru electrodes a Cu upd charge of 520 μC cm$^{−2}$ is found after normalization to the area determined by CO oxidation. Using this value, both methods yield identical surface areas for nanoparticulate Ru catalysts. On Ru surfaces (both massive and nanoparticulate) completely covered by Se the amount of Cu upd charge decreases to one fourth of the value observed for pure Ru. Since CO is only adsorbed on free Ru sites and not on Se covered sites, the oxidation charge for the latter can be used to determine the number of free Ru sites, whereas the decrease of the Cu upd charge on Se modified surfaces can be used to calculate the area which is modified by Se. This method, previously tested on the model electrodes, was extended to Ru nanoparticle and Ru/Se electrodes. Using this surface determination it is possible to draw conclusions about the active surface area and the Se composition of the outer shell of Ru/Se nanoparticles.For the first time we also show, using RRDE measurements, that the oxygen reduction reaction is enhanced by simple Se adsorption also on massive Ru. It could be shown that the activity for the Ru/Se electrode increases with the Se amount on the surface.
Starting Page	1485
Ending Page	1494
Page Count	10
File Format	PDF
ISSN	0021891X
Journal	Journal of Applied Electrochemistry
Volume Number	37
Issue Number	12
e-ISSN	15728838
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-08-28
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cu upd CO oxidation DEMS Ruthenium Selenium RRDE Oxygen reduction Industrial Chemistry/Chemical Engineering Physical Chemistry Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Electrochemistry

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