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Palladium nanocryst...
Palladium nanocrystals supported on helical carbon nanofibers for highly efficient electro-oxidation of formic acid, methanol and ethanol in alkaline electrolytes
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- Hu, Guangzhi (author)
- Umeå universitet,Institutionen för fysik
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- Nitze, Florian (author)
- Umeå universitet,Institutionen för fysik
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- Barzegar, Hamid Reza (author)
- Umeå universitet,Institutionen för fysik
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- Sharifi, Tiva (author)
- Umeå universitet,Institutionen för fysik
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- Mikolajczuk, Ania (author)
- Polish Acad Sci, Inst Phys Chem, PL-01224 Warsaw, Poland
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- Tai, Cheuk-Wai (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm Univ, Arrhenius Lab, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden
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- Borodzinski, Andrzej (author)
- Polish Acad Sci, Inst Phys Chem, PL-01224 Warsaw, Poland
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- Wågberg, Thomas (author)
- Umeå universitet,Institutionen för fysik
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(creator_code:org_t)
- Elsevier BV, 2012
- 2012
- English.
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In: Journal of Power Sources. - : Elsevier BV. - 0378-7753 .- 1873-2755. ; 209, s. 236-242
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We present the synthesis of palladium nanocrystals self-assembled on helical carbon nanofibers functionalized with benzyl mercaptan (Pd-S-HCNFs) and their electrocatalytic activity toward the oxidation of formic acid, methanol and ethanol. Helical carbon nanofibers (HCNFs) were first functionalized with benzyl mercaptan based on the pi-pi interactions between phenyl rings and the graphitic surface of HCNFs. Palladium nano crystals (PdNC) were fixed on the surface of functionalized HCNF by Pd-S bonds in a simple self-assembly method. The as-prepared materials were characterized by high resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), cyclic voltammetry (CV), and fuel cell tests. CV characterization of the as-prepared materials shows a very high electrocatalytic activity for oxidation of formic acid, ethanol and methanol in strong alkaline electrolyte. In comparison to commercial catalyst Vulcan XC-72 decorated with Pd nanoparticles, the proposed Pd-S-HCNFs nano composite material shows oxidation currents for formic acid, ethanol and methanol at the Pd-S-HCNF-modified electrode that are higher than that at the Pd/XC-72 modified electrode with a factor of 2.0, 1.5, and 2.3, respectively. In a formic acid fuel cell the Pd-S-HCNF modified electrode yields equal power density as commercial Pd/XC-72 catalyst. Our results show that Pd-decorated helical carbon nanofibers with diameters around 40-60 nm have very high potential as active material in fuel cells, electrocatalysts and sensors.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Helical carbon fibers
- Electrocatalysts
- Palladium
- Nanoparticles
- Electron microscopy
- Fuel cells
Publication and Content Type
- ref (subject category)
- art (subject category)
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