Mo oxide modified catalysts for direct methanol, formaldehyde
and formic acid fuel cells |
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Authors: | Chaojie Song Mohammad Khanfar Peter G Pickup |
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Affiliation: | (1) Department of Chemistry, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada, A1B 3X7 |
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Abstract: | Pt black and PtRu black fuel cell anodes have been modified with Mo oxide and evaluated in direct methanol, formaldehyde and
formic acid fuel cells. Mo oxide deposition by reductive electrodeposition from sodium molybdate or by spraying of the fuel
cell anode with aqueous sodium molybdate resulted in similar performance gains in formaldehyde cells. At current densities
below ca. 20 mA cm−2, cell voltages were 350–450 mV higher when the Pt catalyst was modified with Mo oxide, but these performance gains decreased
sharply at higher current densities. For PtRu, voltage gains of up to 125 mV were observed. Modification of Pt and PtRu back
catalysts with Mo oxide also significantly improved their activities in direct formic acid cells, but performances in direct
methanol fuel cells were decreased. |
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Keywords: | electrocatalysis formaldehyde formic acid fuel cell methanol molybdenum oxide platinum |
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