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《天然气化学(英文版)》
>Study on durability of Pt supported on graphitized carbon under simulated start-up/shut-down conditions for polymer electrolyte membrane fuel cells
Study on durability of Pt supported on graphitized carbon under simulated start-up/shut-down conditions for polymer electrolyte membrane fuel cells
The primary issue for the commercialization of proton exchange membrane fuel cell (PEMFC) is the carbon corrosion of support under start-up/shut-down conditions.In this study,we employ the nanostructured graphitized carbon induced by heat-treatment.The degree of graphitization starts to increase between 900 and 1300 ℃ as evidenced by the change of specific surface area,interlayer spacing,and ID/IGvalue.Pt nanoparticles are deposited on fresh carbon black (Pt/CB) and carbon heat-treated at 1700 ℃ (Pt/HCB17) with similar particle size and distribution.Electrochemical characterization demonstrates that the Pt/HCB17 shows higher activity than the Pt/CB due to the inefficient microporous structure of amorphous carbon for the oxygen reduction reaction.An accelerating potential cycle between 1.0 and 1.5 V for the carbon corrosion is applied to examine durability at a single cell under the practical start-up/shutdown conditions.The Pt/HCB17 catalyst shows remarkable durability after 3000 potential cycles.The Pt/HCB17 catalyst exhibits a peak power density gain of 3%,while the Pt/CB catalyst shows 65% loss of the initial peak power density.As well,electrochemical surface area and mass activity of Pt/HCB17 catalyst are even more stable than those of the Pt/CB catalyst.Consequently,the high degree of graphitization is essential for the durability of fuel cells in practical start-up/shut-down conditions due to enhancing the strong interaction of Pt and π-bonds in graphitized carbon.
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