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High surface area tungsten carbide microspheres as effective Pt catalyst support for oxygen reduction reaction

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Abstract.
In the present work, the preparation of high surface area (256 m2 g-1) tungsten carbide microspheres
(TCMSs) by the aid of a simple hydrothermal method is realized and the performance of the Pt
electrocatalyst supported on the as-prepared TCMSs towards the oxygen reduction reaction (ORR) is
investigated. The SEM micrographs indicated that both the synthesized carbon microspheres (CMSs) and
TCMSs showed perfect microsphere structure and uniform size. The EDX measurements confirmed that
when the C/Wmass ratio is 2.5/1, tungsten and carbon coexist in themicrospheres. Moreover, from the
XRD results, it can be found that bothW2C and WC are detected andW2C exists as themain phase. It was
found that the Pt particles are uniformly dispersed on the supports, while the corresponding average
particle size is 3.7, 4.1 and 4.3 nm for Pt/C, Pt/CMSs and Pt/TCMSs, respectively. It was also found that in
terms of ORR onset potential and mass activity, the Pt/TCMSs catalyst exhibits superior performance to
that of Pt/CMSs and Pt/C, enhancing the ORR catalytic activity by more than 200%. The above behavior
could be attributed to its higher electrochemical surface area (ESA), as well as to the synergistic effect
between Pt and tungsten carbides.

Keywords: Tungsten carbides, Proton exchange membrane fuel cells, Oxygen reduction reaction

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Informasi Detail

Judul Seri

Applied Catalysis B: Environmental

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis B: Environmental 89 (2009) 223–228

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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