کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6603046 | 1424084 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Formic acid electrooxidation activity of Pt and Pt/Au catalysts: Effects of surface physical properties and irreversible adsorption of Bi
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Revealing formic acid oxidation (FAO) behaviors and designing a catalyst are very important in direct formic acid fuel cell industry. Herein, we introduced various Pt substrates of Pt nanoparticles (Pt NPs), Pt deposits on Au nanoparticles (Pt/Au NPs), Pt disk, and Pt deposits on bulk Au disks (Pt/Au disk), and the catalysts modified with Bi by irreversible adsorption. For FAO in the absence of Bi-modification, the catalytic activity increased in the order of Pt diskâ¯<â¯Pt NPâ¯<â¯Pt/Au diskâ¯<â¯Pt/Au NP. On the other hand, the presence of Bi on Pt surfaces enhanced the catalytic performance in the order of Pt/Au NPâ¯<â¯Pt/Au diskâ¯ââ¯Pt NPâ¯<â¯Pt disk. The observed activities were found to be highly correlated with a synergistic effect by Bi modification and the surface physical properties of various modified Pt substrates. The single fuel cell performances of various Bi-modified Pt NPs and Pt/Au NPs were additionally examined for real application: the performances per substrate surface area, and Pt mass of Pt/Au NPs and Bi/Pt/Au NPs were better than those of Pt NP and Bi/Pt NPs. Furthermore, the presence of Bi corresponded to single cell potentials higher than those in the absence of Bi by more than 0.1â¯Vâ¯at 100â¯mAâ¯cmâ2. The full understanding of the effects of surface physical properties and the irreversible adsorption of Bi further deepens the catalytic pathways of formic acid oxidation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 273, 20 May 2018, Pages 307-317
Journal: Electrochimica Acta - Volume 273, 20 May 2018, Pages 307-317
نویسندگان
Jae Kwang Yoo, Mihwa Choi, Seugran Yang, Bonggeun Shong, Hee-Suk Chung, Youngku Sohn, Choong Kyun Rhee,