EFFECT OF PRETREATMENT ON PT-CO/C CATHODE CATALYSTS FOR THE OXYGEN-REDUCTION REACTION [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 621.38 Electronics, communications engineering
• Thông tin xuất bản: Aiken, S.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Savannah River Site ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2010
• Mô tả vật lý: Size: 3280-3286 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 257019
• Chủ đề: 1. 30 direct energy conversion; 2. Borohydrides; 3. Carbon; 4. Catalysts; 5. Cathodes; 6. Deposition; 7. Electrocatalysts; 8. Electrons; 9. Et al; 10. Fuel cells; 11. Nitric acid

Tóm tắt

Carbon supported Pt and Pt-Co electrocatalysts for the oxygen reduction reaction in low temperature fuel cells were prepared by the reduction of the metal salts with sodium borohydride and sodium formate. The effect of surface treatment with nitric acid on the carbon surface and Co on the surface of carbon prior to the deposition of Pt was studied. The catalysts where Pt was deposited on treated carbon the ORR reaction preceded more through the two electron pathway and favored peroxide production, while the fresh carbon catalysts proceeded more through the four electron pathway to complete the oxygen reduction reaction. NaCOOH reduced Pt/C catalysts showed higher activity that NaBH{sub 4} reduced Pt/C catalysts. It was determined that the Co addition has a higher impact on catalyst activity and active surface area when used with NaBH{sub 4} as reducing agent as compared to NaCOOH.