Highly stable and ordered intermetallic PtCo alloy catalyst supported on graphitized carbon containing Co@CN for oxygen reduction reaction. Issue 38 (24th August 2020)

• Record Type: Journal Article
• Authors: Jung, Won Suk; Lee, Woong Hee; Oh, Hyung-Suk; Popov, Branko N.
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 38(2020)
• Page Start: 19833
• Page End: 19842
• Publication Date: 2020-08-24
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta05182a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Ordered intermetallic PtCo synthesized from N-doped graphitic carbon-containing Co presents the high durability with low Pt loading after 30 000 load-simulated cycles in proton exchange membrane fuel cells. Abstract : A PtCo alloy catalyst was prepared by thermal diffusion of Co encapsulated with thin N-doped carbon layers on graphitic carbon into a Pt lattice (PtCo/NGC). The Co diffused up to the near-Pt surface and resulted in an intermetallic PtCo structure without the leaching process. The intermetallic PtCo structure thermally treated under optimized conditions showed 3-fold higher mass activity than the commercial Pt/C. The potential and maximum power density loss of PtCo/NGC after 30 000 potential cycles were 34 mV and 11%, respectively, which indicated that the PtCo/NGC was remarkably stable when compared to commercial Pt/C and commercial PtCo/GC catalysts. The enhanced catalytic performance and stability of the PtCo/NGC catalyst were attributed to the formation of an intermetallic structure that alleviated the Pt oxidation and Co dissolution. The outstanding performance and stability qualify the ordered intermetallic PtCo/NGC to be a promising cathode catalyst for the commercialization of fuel cells.