Platinum nanoparticles embedded in pyrolyzed nitrogen-containing cobalt complexes for high methanol-tolerant oxygen reduction activity

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Title:	Platinum nanoparticles embedded in pyrolyzed nitrogen-containing cobalt complexes for high methanol-tolerant oxygen reduction activity
Authors:	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)
Contributors:	化材所
Keywords:	CO ALLOY ELECTROCATALYSTS FUEL-CELLS CONTAINING ELECTROLYTES CATHODE CATALYSTS CROSSOVER RUTHENIUM ELECTRODES SELENIUM NI TETRAMETHOXYPHENYLPORPHYRIN
Date:	2010-12
Issue Date:	2011-12-15 15:39:36 (UTC+8)
Abstract:	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.
Appears in Collections:	[Department of Chemical & Materials Engineering] journal articles

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