Activity of oxygen reduction reaction on small amount of amorphous CeOx promoted Pt cathode for fuel cell application |
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| Authors: | Keisuke Fugane Toshiyuki Mori Ding Rong Ou Akira Suzuki Hideki Yoshikawa Takuya Masuda Kohei Uosaki Yoshiyuki Yamashita Shigenori Ueda Keisuke Kobayashi Noriyasu Okazaki Iva Matolinova Vladimir Matolin |
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| Affiliation: | aGraduate School of Chemical Sciences and Engineering, Hokkaido University, Kita13, Nishi8, Kita-ku, Sapporo, Hokkaido 060-8628 Japan;bFuel Cell Materials Center and Innovative Center of Nanomaterials Science for Environment and Energy, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;cNIMS Beamline Station at SPring-8, National Institute for Materials Science, Sayo, Hyogo 679-5148, Japan;dDepartment of Biotechnology and Environmental Chemistry, Kitami Institute of Technology, 165 Koen-cho kitami, Hokkaido 090-8507, Japan;eDepartment of Surface and Plasma science, Charles University, V Holesovickach 2, 180 00 Prague 8, Czech Republic;fLaboratory of Fuel Cells, Dalian Institute of Chemical Physics Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning 116023, China |
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| Abstract: | Pt on ceria (CeOx) particles supported on carbon black (CB) were synthesized using the combined process of hot precipitation and impregnation methods. During 30 cycles of cyclic voltammetry pre-treatment in the potential ranging from −0.2 to 1.3 V (V vs. Ag/AgCl), it was observed that a small amount of CeOx, which consisted of the interface region between Pt and CeOx, remained on Pt particles. Other free CeOx particles were dissolved into H2SO4 aqueous solution. To develop the Pt-CeOx/CB catalyst, the surface chemical states, the net chemical composition, morphology and electrochemical behavior in H2SO4 aqueous solution were characterized. Our microanalysis and electrochemical analysis indicate that the active CeO2 with high specific surface area provides the continuous amorphous cerium oxide (Ce3+, Ce4+) layer with pores on the surface of Pt particles. It is concluded that the amorphous cerium oxide layer on Pt inhibits the oxidation of Pt surface and contributes to enhancement of the activity on Pt cathode. The single cell performance was also improved using the Pt-CeOx/CB cathode. Based on all data, it is expected that the design based on characterization of the interface between Pt and small amount of amorphous cerium oxide layer could help in preparation of more active Pt catalyst. |
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| Keywords: | Oxygen reduction reaction Pt-CeOx Cathode Fuel cell Small amount of amorphous CeOx |
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