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請使用永久網址來引用或連結此文件:
https://irlib.pccu.edu.tw/handle/987654321/21116
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| 題名: | Platinum nanoparticles embedded in pyrolyzed nitrogen-containing cobalt complexes for high methanol-tolerant oxygen reduction activity |
| 作者: | Wang, CH (Wang, Chen-Hao)
Hsu, HC (Hsu, Hsin-Cheng)
Chang, ST (Chang, Sun-Tang)
Du, HY (Du, He-Yun)
Chen, CP (Chen, Chin-Pei)
Wu, JCS (Wu, Jeffrey Chi-Sheng)
Shih, HC (Shih, Han-Chang)
Chen, LC (Chen, Li-Chyong)
Chen, KH (Chen, Kuei-Hsien) |
| 貢獻者: | 化材所 |
| 關鍵詞: | CO ALLOY ELECTROCATALYSTS
FUEL-CELLS
CONTAINING ELECTROLYTES
CATHODE CATALYSTS
CROSSOVER
RUTHENIUM
ELECTRODES
SELENIUM
NI
TETRAMETHOXYPHENYLPORPHYRIN |
| 日期: | 2010-12 |
| 上傳時間: | 2011-12-15 15:39:36 (UTC+8) |
| 摘要: | High oxygen reduction activity of methanol-tolerant catalysts was successfully reported using platinum nanoparticles embedded in cobalt-based nitrogen-containing complexes supported on carbon blacks (Pt-N-complex/C). The oxygen reduction reaction (ORR) of the Pt-N-complex/C was attributed to four-electron transfer pathway in which oxygen was directly reduced to water, yielding four electrons. In a methanol-containing solution, the platinum intrinsically favors the methanol oxidation reaction over the ORR, which is a major drawback for direct methanol fuel cells (DMFCs). In comparison, when the Pt-N-complex/C is introduced in a methanol-containing solution, not only is the methanol oxidation suppressed but also the four-electron-transfer in the ORR is maintained up to the diffusion-limiting region. Physicochemical characterization of the Pt-N-complex/C indicates that pyrrolic N-type poly-aromatic hydrocarbons were formed in a network structure around the catalysts and prevented them from the methanol oxidation reaction. In a DMFC test at elevated methanol concentrations, the one with the Pt-N-complex/C cathode showed superior stability over the one with the Pt-based cathode, which may offer a solution to the methanol crossover problem in DMFCs. |
| 顯示於類別: | [化學工程與材料工程學系暨碩士班] 期刊論文
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