Electrocatalytic activity of a nitrogen-enriched mesoporous carbon framework and its hybrids with metal nanoparticles fabricated through the pyrolysis of block copolymers

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题名:	Electrocatalytic activity of a nitrogen-enriched mesoporous carbon framework and its hybrids with metal nanoparticles fabricated through the pyrolysis of block copolymers
作者:	孫亞賢;Lu, Yen-Hsing;Liou, Jiun-You;Lin, Chien-Fu;Sun, Ya-Sen
贡献者:	工學院化學工程與材料工程學系
关键词:	Alloys;Carbon;Carbonization;catalytic activity;chemical composition;composite polymers;Crosslinking;electrochemistry;electrodes;electrolytes;gold;image analysis;Nanoparticles;nanosilver;nitrogen;Oxygen;photochemistry;porous media;pyrolysis;Raman spectroscopy;Reduction (electrolytic);silver;Silver base alloys
日期:	2015-01-01
上传时间:	2026-04-21 14:31:38 (UTC+8)
出版者:	Royal Society of Chemistry
摘要:	摘要： Nanostructures with a nitrogen-enriched mesoporous carbon framework (NEMCF) were prepared through a simple carbonization of cross-linked polystyrene- block -poly(2-vinylpyridine). NEMCF has a rich mesoporosity because of the morphological fidelity upon cross-linking and carbonization. Hybrids of NEMCF with metal nanoparticles ( i.e. , AgNEMCF) or binary metal alloys ( i.e. , Ag–AuNEMCF) were prepared through a photochemical reduction or a photochemical reduction and galvanic replacement in combination. The inner architecture, the chemical composition and the graphitization of NEMCF and NEMCF-supported metal nanomaterials were studied with electron imaging, X-ray and Raman scattering, and electron spectra; the electrocatalytic activity of oxygen reduction in a basic electrolyte was measured with a rotating disk electrode. The nitrogen configurations of NEMCF were dominated by pyridinic and pyrrolic nitrogen, so that NEMCF displayed a two-electron transfer pathway for the oxygen reduction reaction (ORR). As Ag NPs and Ag–Au alloys composed of minor Au and major Ag were incorporated within the NEMCF matrix, a four-electron transfer pathway, a large kinetic current density and a small onset potential were obtained. Nevertheless, the electrocatalytic activity of the Ag–Au alloys within the NEMCF depended strongly on the compositional proportion, the size of the Au component and the extent of dispersion of the Ag–Au alloys. 出版日期： 2015-01-01 出處： RSC advances, 2015-01, Vol.5 (128), p.105760-105773 資源來源： Royal Society of Chemistry 識別號： ISSN: 2046-2069 識別號： EISSN: 2046-2069 識別號： DOI: 10.1039/C5RA22528K
显示于类别:	[化學工程與材料工程學系 ] 期刊論文

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