Electrochemical Characterization of Hydrothermally Synthesized Pt--Ru--Ni--P Catalyst for Direct Methanol Fuel Cell
Pt--Ru--Ni--P/multiwalled carbon nanotube (MWCNT) catalyst is synthesized by a hydrothermal process using sodium hypophosphite (NaH 2 PO 2 ) as a reducing agent. The particle size is evaluated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The electrocatalytic activity of a P...
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| Published in: | Japanese Journal of Applied Physics 2013-03, Vol.52 (3), p.035001-035001-6 |
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| Main Authors: | , , |
| Format: | Article |
| Language: | eng |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Pt--Ru--Ni--P/multiwalled carbon nanotube (MWCNT) catalyst is synthesized by a hydrothermal process using sodium hypophosphite (NaH 2 PO 2 ) as a reducing agent. The particle size is evaluated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The electrocatalytic activity of a Pt--Ru--Ni--P/MWCNT catalyst for methanol electro-oxidation has been studied by cyclic voltammetry, chromoamperometry, and impedance spectroscopy. TEM images reveal that the Pt--Ru--Ni--P nanoparticles have a wide size distribution with an average size of 3.2 nm. Pt--Ru--Ni--P/MWCNT catalyst shows an electrochemically active surface area of 63.2 m 2 g -1 and a mass activity of 187.56 mA mg Pt -1 . It has been found that the presence of phosphorus as an interstitial species can enhance the dispersion as well as reduce the size of Pt--Ru--Ni--P nanoparticles. Moreover, incorporation of phosphorus into the Pt--Ru--Ni/MWCNT catalyst shows a 1.5 times higher electrocatalytic activity. The power density (57 mW cm -1 ) of the Pt--Ru--Ni--P/MWCNT catalyst in fuel cell tests is higher than that (40 mW cm -1 ) of the Pt--Ru--Ni/MWCNT catalyst. |
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| ISSN: | 0021-4922 1347-4065 |