Enhanced Activity and Stability of Pt-Hf Alloy Catalysts for Electrocatalytic Oxygen Reduction
- Enhanced Activity and Stability of Pt-Hf Alloy Catalysts for Electrocatalytic Oxygen Reduction
- 유성종; 황승준; 이국승; 김형준; 김수길; 임태훈
- PEMFC; Pt-Hf alloy; Oxygen reduction reaction; stability
- Issue Date
- Notwithstanding a polymer electrolyte membrane fuel cell (PEMFC) is a promising alternative device to
reduce our reliance on environmentally unfriendly fossil fuel, there are several problems that should be
overcome to make PEMFC more economically attractive. One of the most pivotal issues of problems is
considerable overpotential associated with the slow reaction rate of the oxygen reduction at the cathode. Much
effort has hitherto been devoted to understanding the kinetic and mechanism of ORR in an attempt to search
for inexpensive and catalytically active electrocatalysts such as bi and multi-metallic alloys. Recently, there
have been studies concerning the correlation between the electronic structure and catalytic activity of metallic
alloys for the ORR. The absorption energy of oxygen is proportional to the oxygen-metal bond strength and
relative level of the position of the d-band center at the Fermi level. Other tremendous challenge is the
stability for electrochemical reaction, including metal dissolution and surface oxide formation, which occurs
intensely in acid medium at high potential. In recent report, Markovic et al. and Adzic et al. have demonstrated
the stable cathode catalyst by alloying Pt with 3-d transition metal (especially, Pt-skin surface alloys) and
modifying Pt with Au cluster and emphasized the significance of stability considerations. In spite of the
significant technological interest in finding active and stable catalyst for ORR condition, the direct
experimental inspection of the contributions of the stability involving activity has rarely been investigated in
electrochemical reduction of oxygen.
Herein we report more active and stable electrocatalytic cathode materials consisting of Pt-based alloys
involving late and early transition metals.
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