A carbon-supported Pt2Ni1 catalyst with a Pt rich shell was prepared using a high temperature treatment. In this process, polydopamine (PDA) encapsulates whole Pt/C and acts as a protective coating layer to suppress sintering effects of particles during the high temperature treatment. Dopamine, a mussel-inspired substrate, is an effective surface coating material because the polymerization of dopamine takes place easily at room temperature and exhibits a strong adhesive function with almost any surface. With increasing thickness of the PDA coating layer, the particle size became smaller following heat-treatment. However, when excess PDA was used, residue remained on the surface of catalyst. As a result, the active surface area of catalyst was reduced, thereby resulting in lowered catalytic performance. The Pt2Ni1/C catalyst prepared with an optimized amount of PDA layer exhibited improved mass activity of 0.43 A mgPt−1 at 0.9 V, which is almost two times higher than that of Pt/C.
Bibliographical noteFunding Information:
This material is based upon work supported by the Ministry of Trade, Industry and Energy (MOTIE, Korea) under the Industrial Technology Innovation Program. No.10062511, “Design and modelling of Gas Diffusion layer and Bipolar plate integrated Porous electrode structure for high power in hydrogen fuel cell vehicle”, and the Priority Research Centers Program through the National Research Foundation of Korea (2009-0093823), and the Yonsei University Research Fund(Post Doc. Researcher Supporting Program) of 2016 (Project No.: 2016-12-0005).
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry