Electronic Effects in Stability and Activity of Pt-based Alloy Catalysts for Oxygen Reduction
- Electronic Effects in Stability and Activity of Pt-based Alloy Catalysts for Oxygen Reduction
- 유성종; 황승준; 김수길; 정남기; 이승철; 성영은; 임태훈
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- The electrocatalysts for polymer electrolyte membrane fuel cells (PEMFCs) must be designed by two equally important fundamental principles: the optimization of electrocatalytic activities as well as the long-term stability in acid mediums (<1 pH) at high potential (0.8 V). We report here a solution based approach to the preparation of Pt-based alloy with early transition metals and the realistic parameters elucidating stability and activity of Pt3M (M = Y, Zr, Ti, Ni, and Co) catalysts for oxygen reduction reaction (ORR). The enhanced stability and activity of Pt-based alloy catalysts in ORR and the relationship between electronic structure modification and stability were studied by experiment and DFT calculations. Stability correlates with the d-band fillings and the heat of alloy formation of Pt3M alloys, which in turn depends on the degree of the electronic perturbation due to alloying. This concept provides the realistic parameter for the rational catalyst design in Pt-based alloy system.
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