Pt-based trimetallic nanocrystals with high proportions of M (M=Fe,Ni) metals for catalyzing oxygen reduction reaction |
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| Affiliation: | 1. State Key Laboratory of Chemical Resource Engineering, Institute of Modern Catalysis, Department of Organic Chemistry, Beijing Engineering Center for Hierarchical Catalysts, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China;2. Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, China;1. Institute for Energy Research, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, PR China;2. Institute of Green Chemistry and Chemical Technology, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, PR China;3. Department of Chemistry, University of the Western Cape, Robert Sobukwe Road, Cape Town, 7535, South Africa;1. Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea;2. School of Chemical and Biological Engineering, Seoul National University, Seoul 151-744, Republic of Korea;3. School of Advanced Materials Engineering, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 136-702, Republic of Korea;1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Life Sciences, College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China;2. School of Chemistry and Biological Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;3. College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, China;1. College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, PR China;2. Inner Mongolia Key Lab of Nanoscience and Nanotechnology, Inner Mongolia University, Hohhot 010021, PR China;3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China |
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| Abstract: | For boosting oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs), a new type of multi-functional catalyst with high activity, high stability, and low cost has been designed and prepared by introducing high proportions of M (M = Fe, Ni) metals in Pt-based nanoparticles through a microwave-assisted polyol method, followed by thermal annealing process. A uniform dispersion of nanoparticles (5 nm) and a face-centered tetragonal (fct) phase improve the activity and stability of the Pt–Fe–Ni/C catalyst. Owing to differences in the surface energies of the alloying elements, Pt atoms with low surface energy have a tendency to segregate from the subsurface to the surface during the annealing. This tendency exposes the internal Pt atoms to the surface of the nanoparticles in the existence of high proportions of M metals, significantly improving the utilization of Pt. As a cathode catalyst, the Pt–Fe–Ni/C catalyst annealed at 675 °C with a mass activity of 0.73 A/mgPt, which is 3.5 times higher than that of the commercial Pt/C catalyst, exhibits an excellent half-cell performance. An accelerated durability test demonstrates that the prepared Pt–Fe–Ni/C-675 catalyst is more stable than the commercial Pt/C. The proposed multi-functional catalyst has great potential for PEMFCs and other applications. |
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| Keywords: | Intermetallic Low platinum loading Electrocatalyst Oxygen reduction reaction Proton exchange membrane fuel cells |
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