Enhanced durability of Pt/C catalyst by coating carbon black with silica for oxygen reduction reaction
| Autor: | Jahowa Islam, Sang-Kyung Kim, Eunjik Lee, Kyoung-Hee Kim, Gu-Gon Park |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Oxide Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Carbon black engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrocatalyst 01 natural sciences Oxygen 0104 chemical sciences Catalysis chemistry.chemical_compound Fuel Technology chemistry Chemical engineering Coating engineering 0210 nano-technology Platinum Carbon |
| Zdroj: | International Journal of Hydrogen Energy. 46:1133-1143 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.09.194 |
| Popis: | A platinum electrocatalyst was presented for oxygen reduction reaction that the durability to potential cycling was enhanced. It was synthesized by coating carbon black with a silica layer, followed by Pt deposition on it. To investigate the durability of the electrocatalyst, two accelerated degradation testing protocols were carried out. Carbon corrosion and platinum metal degradation properties were evaluated under the potential cycling between 1.0 and 1.5 V and between 0.6 and 0.95 V, respectively. Silica-coated catalysts (Pt/CB-SiO2) showed better stabilities compared to the commercial Pt/C catalyst under both of the two protocols. Commercial Pt/C catalyst initially had better mass activity than silica-coated catalysts but it became similar after the potential cycling of carbon corrosion. TEM showed the platinum particle aggregation and particle density decrease especially for the commercial catalyst by the potential cycling. The silica coating prevents carbon corrosion by blocking the carbon support from direct contact with the oxygen source and preventing the effect of oxygen spillover from the platinum to carbon during the potential cycling between 1.0 and 1.5 V. It also alleviates platinum dissolution in reverse scans by reducing the formation of Pt oxide during potential cycling in between 0.6 and 0.95 V. The results suggest the coating of carbon support can enhance the durability of Pt/C catalyst to the potential cycling. |
| Databáze: | OpenAIRE |
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