Web Release Date: January 30,
Spontaneous Reduction of Pt(IV) onto the Sidewalls of Functionalized Multiwalled Carbon Nanotubes as Catalysts for Oxygen Reduction Reaction in PEMFCs
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The State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China, School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China, School of Material Science and Engineering, Chongqing University, Chongqing 400044, China, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China, and The State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
Received: October 12, 2007
In Final Form: December 5, 2007
Abstract:
This paper reports spontaneous formation of metal nanoparticles on the sidewalls of the functionalized MCNTs (FMCNTs) when the FMCNTs were immersed in corresponding metal salt solutions. At first, MCNTs were functionalized by oxidation of a mixture consisting of H2SO4/HNO3 or H2SO4/H2O2 and formed oxygen-containing functional groups such as -COOH, -OH, etc., by which the metal ions (Pt4+) were reduced on the sidewalls of FMCNTs. No other substance that is suspicious of being a reducer was introduced in the Pt4+ ion reduction. The properties of FMCNTs and platinized FMCNTs were characterized electrochemically and instrumentally. The results showed that the electrode made from platinized FMCNTs with Pt loading of 0.12 mg cm-2 had enhanced catalytic activity for the oxygen reduction reaction over one made from commercial Pt/C catalyst with Pt loading of 0.27 mg cm-2.
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