Academic Journal
Influence of TiO2 coverage on activity and stability of Pd-TiO2/MWCNT-supported catalysts used in direct formic acid fuel cells
| العنوان: | Influence of TiO2 coverage on activity and stability of Pd-TiO2/MWCNT-supported catalysts used in direct formic acid fuel cells |
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| المؤلفون: | Malolepszy, A., Mazurkiewicz-Pawlicka, M., Stobinski, L., Lesiak-Orłowska, B., Mierzwa, B., Kövér, L., Tóth, J., Chang, Yuan Chih |
| المساهمون: | Politechnika Warszawska, Polska Akademia Nauk, Magyar Tudományos Akadémia, European Regional Development Fund |
| المصدر: | Journal of Materials Science ; volume 59, issue 16, page 6894-6915 ; ISSN 0022-2461 1573-4803 |
| بيانات النشر: | Springer Science and Business Media LLC |
| سنة النشر: | 2024 |
| الوصف: | Pd and TiO 2 supported on functionalized multiwall carbon nanotubes (f-MWCNTs) catalysts were investigated in formic acid electrooxidation reaction in direct formic acid fuel cell. TiO 2 (5–60 wt.% loading) on f-MWCNTs was deposited using microwave-assisted hydrothermal method. 20 wt.% of Pd was deposited on TiO 2 /f-MWCNTs by reduction of palladium (II) chloride salt with sodium borohydride. Catalysts’ structure and composition were characterized by XRD, STEM, HR-TEM, TGA, XPS/XAES (Pd, Ti, O spectra features, density of valence states, Auger parameters). Average crystallite size of Pd and TiO 2 from XRD (3–4 nm) agrees with those by HR-TEM (3–5 nm). Low TiO 2 coverages (below 32wt.%) show smaller crystallites due to increased surface hydrophilicity, higher amount of TiO 2 oxygen vacancies with attached Pd nanoparticles, increased density of valence states of strong Pd–TiO 2 interface. In contrary, the higher coverages indicate lower amount of Pd–O–Ti, Ti–O–C, Pd–O–C interfaces, with electron charge transfer from TiO 2 to f-MWCNTs, and to Pd. Catalysts activity (40–106 mWmg Pd −1 ) and stability (5–240 h) are enhanced at low TiO 2 coverages (4–8 wt.%) due to a strong Pd-TiO 2 interface on oxygen vacancies, improved electron transport and a high active surface area. Oscillatory self-cleaning mechanism of Pd is due to oxidation by -OH groups (TiO 2 , f-MWCNTs), and hydrogen and CO spillover. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1007/s10853-024-09586-5 |
| DOI: | 10.1007/s10853-024-09586-5.pdf |
| DOI: | 10.1007/s10853-024-09586-5/fulltext.html |
| الاتاحة: | http://dx.doi.org/10.1007/s10853-024-09586-5 https://link.springer.com/content/pdf/10.1007/s10853-024-09586-5.pdf https://link.springer.com/article/10.1007/s10853-024-09586-5/fulltext.html |
| Rights: | https://creativecommons.org/licenses/by/4.0 ; https://creativecommons.org/licenses/by/4.0 |
| رقم الانضمام: | edsbas.103B1804 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1007/s10853-024-09586-5 |
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