The effect of Mn addition on the promotion of oxygen reduction reaction performance for PtCo/C catalysts

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Title:	The effect of Mn addition on the promotion of oxygen reduction reaction performance for PtCo/C catalysts
Authors:	王冠文;Hsu, Shu-Ping;Liu, Chen-Wei;Chen, Hong-Shuo;Chen, Tsan-Yao;Lai, Chien-Ming;Lee, Chih-Hao;Lee, Jyh-Fu;Chan, Ting-Shan;Tsai, Li-Duan;Wang, Kuan-Wen
Contributors:	工學院材料科學與工程研究所
Keywords:	Alloying effects;Catalysis;Catalysts;Electron transfer number;Emission analysis;Extended X-ray absorption fine structure (EXAFS);Inductively coupled plasma;Manganese;Oxygen reduction reaction (ORR);Platinum;Promotion;PtCo/C catalysts;Reduction;X-rays
Date:	2013-01-01
Issue Date:	2026-04-23 11:47:09 (UTC+8)
Publisher:	Elsevier Ltd.;Elsevier Ltd
Abstract:	摘要： The effect of Mn addition on the promotion of oxygen reduction reaction (ORR) performance for PtCo/C catalysts is investigated. The structures, surface compositions, chemical compositions, local structural parameters including coordination numbers and bond distances, morphologies and electrochemical properties of prepared catalysts are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma-atomic emission spectrometer (ICP-AES), extended X-ray absorption fine structure (EXAFS), high resolution transmission electron microscopy (HRTEM) and rotating disk electrode (RDE) technique, respectively. For PtCo/C catalysts modified with 0.4 and 3.2wt% of Mn, the Pt/Co atomic ratio is 3.5 and the size is about 3.0nm with the same face centered cubic (fcc) structure. Moreover, Mn-modified PtCo/C catalysts have the same surface composition, which is about Pt/Co/Mn of 62/32/6, and their ORR activity are both higher than that of PtCo/C and commercial Pt/C catalysts. After accelerated durability test (ADT) of 1700 cycles, Mn-2 with 3.2wt% Mn addition still presents the best ORR mass activity, which is about 420% of commercial Pt/C. In the Mn-modified PtCo/C system, due to the existence of the neighboring Co and/or Mn oxide, there is OH repulsion between Pt–OH and these non-noble metal hydroxides or oxides, decreasing the OH coverage on Pt and increasing the number of free Pt active sites. Besides, based on the XAS analysis, the unfilled d-orbital values and extent of hybridization of Pt and Co/Mn of the PtCo and Mn-modified samples are very similar. Therefore, the promotional effect on ORR performance of Mn-2 is attributed to the most enhanced Pt-skin structure, highest Pt usage, and comparable electron transfer number during ORR instead of changes in d-orbital vacancy and alloying degree. 出版者： Elsevier Ltd 出版日期： 2013-08-30 出處： Electrochimica acta, 2013-08, Vol.105, p.180-187 版權： 2013 Elsevier Ltd 識別號： ISSN: 0013-4686 識別號： EISSN: 1873-3859 識別號： DOI: 10.1016/j.electacta.2013.04.138
Appears in Collections:	[Institute of Materials Science and Engineering] journal & Dissertation

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