By Zhen-Xing Liang, Tim S. Zhao, Laurie Peter, Ferdi Schüth, Heinz Frei, D Thompsett, Timo Jacob, Claude Lamy, Christophe Coutanceau, Chuan-Jian Zhong, Yi Ding, Kylie Vincent, Eileen Yu, Ulrike Krewer, Rongyue Wang, Wang Gao, Mario Simoes, Steve Baranton, Ho
Content material: advent; coaching of Nanocatalysts for DOFCs; Nanocatalysts for Formic Acid Oxidation response; Nanocatalysts for Alcohol Oxidation response (AOR); Nanocatalysts for Liquid Borohydride Oxidation; Nanocatalysts for Oxygen aid response (ORR); Core-Shell Nanostructured Catalysts; Gold-Leaf established Nanocatalysts; Bio-Electrocatalysts for DOFCs; demanding situations and views of Nanocatalyst in DOFCs; Index
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Additional resources for Catalysts for Alcohol-Fuelled Direct Oxidation Fuel Cells
Previously reported results82,87,92 provided evidence that the best activity of the PtRu electrodes for methanol oxidation is obtained with about 20% of Ru surface atoms. 2) involved, either in the oxidation of CO or in that of methanol, should describe correctly the optimum composition found for the Pt1–xRux alloys. 2 31 Structure of the different adsorbed intermediates involved in methanol electro-oxidation on Pt1–xRux electrodes. optimum 50/50 atomic composition. e. 2. g. g. e. 5 at% Ru). 5–20 at% Ru.
In a first approximation, the reaction is controlled by a first-order process in the two oxidation peaks (A) and (B). 8 V vs. RHE for 10 s, is used to oxidize ethanol. 6 V vs. 1 s), which allows cleaning of the electrode surface from the poisoning species (CO and C2 residues) formed during the ethanol adsorption. 2 s, is added to reduce the surface oxygenated species and to adsorb ethanol, before its oxidation. The mean number of electrons, n˜, associated with the overall oxidation process, for each electrolysis, is calculated from the analytical results and from the experimental value of the quantity of electricity, Qex, read on a coulometer during the experiment: ~ n~Qex =(F |Vo |dc) ð1:50Þ where dc is the concentration variation of the electrolyzed solution at a given electrolysis time and Vo is the volume of the electrolyte in the working compartment.
79 Methanol is firstly dissociatively adsorbed at Pt-based electrodes, leading to the cleavage of several C–H bonds, and gives finally the so-called formyl-like species 2CHO. From this species, different steps can occur, but with platinum the dissociation of this species gives rapidly adsorbed CO, which is responsible for the electrode poisoning. This is the explanation of the rather poor performance of Pt catalysts, due to the relatively high potential necessary to oxidize such CO species into CO2.