Electrochemical Characterization of Hydrothermally Synthesized Pt--Ru--Ni--P Catalyst for Direct Methanol Fuel Cell

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概要

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• Pt--Ru--Ni--P/multiwalled carbon nanotube (MWCNT) catalyst is synthesized by a hydrothermal process using sodium hypophosphite (NaH<inf>2</inf>PO<inf>2</inf>) 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 m²g^-1and 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.

• 2013-03-25

著者

• Kim Dong-joo

  Materials Research And Education Center Auburn University

• LEE Seok-Hee

  Department of Electrical Engineering, KAIST

• Yoon Young-Soo

  Department of Advanced Technology Fusion, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea

• Yoon Young-Soo

  Department of Environment and Energy Engineering, Gachon University, Seongnam, Gyonggi 461-710, Republic of Korea

• Lee Seok-Hee

  Department of Environment and Energy Engineering, Gachon University, Seongnam, Gyonggi 461-710, Republic of Korea

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