Abstract
An optimized route for preparation of Ti0.8Mo0.2O2–C composite supports for Pt electrocatalysts with 75/25 and 25/75 oxide/carbon mass ratio was elaborated using commercial (BP: Black Pearls 2000) and functionalized (FC) carbon materials. The sol-gel-based synthesis resulted in complete Mo incorporation into the rutile-TiO2 lattice which is a prerequisite for good CO tolerance and high stability. According to the TG and XPS measurements the highest amount of oxygen-containing functional groups was obtained on the BP carbon annealed in nitrogen at 1000 °C and functionalized with HNO3 and glucose.The electrochemical stability tests for 500 polarization cycles performed on the 20 wt% Pt/Ti0.8Mo0.2O2–C catalysts revealed similarly small performance loss (8.5–11.8%) in case of all support materials. Considering the negative effect of the oxide content of the catalyst layer on the cell resistance, the catalyst with Ti0.8Mo0.2O2/C = 25/75 ratio was chosen as the most promising.
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