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Visualization Analysis of Pt and Co Species in Degraded Pt3Co/C Electrocatalyst Layers of a Polymer Electrolyte Fuel Cell Using a Same-View Nano-XAFS/STEM-EDS Combination Technique
https://uec.repo.nii.ac.jp/records/9670
https://uec.repo.nii.ac.jp/records/967005954638-0af0-470b-b805-4742d2a29803
名前 / ファイル | ライセンス | アクション |
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ACS Appl. Mater. Interface_Ms_rev_Iwasawa (2.5 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2020-11-17 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Visualization Analysis of Pt and Co Species in Degraded Pt3Co/C Electrocatalyst Layers of a Polymer Electrolyte Fuel Cell Using a Same-View Nano-XAFS/STEM-EDS Combination Technique | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題 | visualization analysis | |||||
キーワード | ||||||
言語 | en | |||||
主題 | same-view nano-XAFS/STEM-EDS combination technique | |||||
キーワード | ||||||
言語 | en | |||||
主題 | Pt and Co chemical species maps | |||||
キーワード | ||||||
言語 | en | |||||
主題 | dissolved Pt2+ and Co2+ maps | |||||
キーワード | ||||||
言語 | en | |||||
主題 | PEFC Pt3Co/C degradation process | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Takao, Shinobu
× Takao, Shinobu× Sekizawa, Oki× Higashi, Kotaro× Samjeské, Gabor× Kaneko, Takuma× Sakata, Tomohiro× Yamamoto, Takashi× Uruga, Tomoya× Iwasawa, Yasuhiro |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | In order to obtain a suitable design policy for the development of a next-generation polymer electrolyte fuel cell, we performed a visualization analysis of Pt and Co species following aging and degradation processes in membrane-electrode assembly (MEA), using a same-view. Nano-X-ray absorption fine structure (XAFS)/Scanning transmission electron microscope (STEM)-energy dispersive X-ray spectroscopy (EDS) technique that we developed to elucidate durability factors and degradation mechanisms of a MEA Pt3Co/C cathode electrocatalyst with higher activity and durability than a MEA Pt/C. In the MEA Pt3Co/C, after 5000 ADT-rec (rectangle accelerated durability test) cycles, unlike the MEA Pt/C, there was no oxidation of Pt. In contrast, Co oxidized and dissolved over a wide range of the cathode layer (∼70% of the initial Co amount). The larger the size of the cracks and pores in the MEA Pt/C and the smaller the ratio of Pt/ionomer of cracks and pores, the faster the rate of catalyst degradation. In contrast, there was no correlation between the size or Co/ionomer ratio of the cracks and pores and the Co dissolution of the MEA Pt3Co/C. It was shown that Co dissolved in the electrolyte region had an octahedral Co2+–O6 structure, based on a 150 nm × 150 nm nano-XAFS analysis. It was also shown that its existence suppressed the oxidation and dissolution of Pt. The MEA Pt3Co/C after 10,000 ADT-rec cycles had many cracks and pores in the cathode electrocatalyst layer, and about 90% of Co had been dissolved and removed from the cathode layer. We discovered a metallic Pt–Co alloy band in the electrolyte region of 300–400 nm from the cathode edge and square planar Pt2+–O4 species and octahedral Co2+–O6 species in the area between the cathode edge and the Pt–Co band. The transition of Pt and Co chemical species in the Pt3Co/C cathode electrocatalyst in the MEA during the degradation process, as well as a fuel cell deterioration suppression process by Co were visualized for the first time at the nano scale using the same-view nano-XAFS/STEM-EDS combination technique that can measure the MEA under a humid N2 atmosphere while maintaining the working environment for a fuel cell. | |||||
書誌情報 |
en : ACS Appl. Mater. Interfaces 巻 12, 号 2, p. 2299-2312, 発行日 2020-01-15 |
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出版者 | ||||||
出版者 | American Chemical Society | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 19448244 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1021/acsami.9b16393 | |||||
権利 | ||||||
権利情報 | © 2019 American Chemical Society | |||||
関連サイト | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1021/acsami.9b16393 | |||||
著者版フラグ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa |