Decoration of nickel nanoparticles on multiwalled carbon nanotubes and testing the electrocatalytic activity on methanol/ethanol oxidation for fuel cell application
Krishnamurthy G and Shivakumar M S
Bangalore University, India
: J Nanomater Mol Nanotechnol
The efficient and cost effective electrocatalysts are of great interest for energy application due to the high cost and other associated problems of the existing ones. Here, in this work, the preparation of efficient electrocatalyst/substrate system by electroless deposition of non-noble metal nanoparticles, in particular the Ni/Multiwalled Carbon nanotubes(MWCNTs) has been prepared and tested for Methanol and Ethanol oxidation. The MWCNTs were synthesized by solvotehrmal procedure at a low temperature range of about 180â220Â°C in an autoclave system. The products were characterized by high-resolution transmission electron microscopy, powder X-ray diffraction, energy dispersive X-ray analysis and X-ray photoelectron spectroscopy. The Nickel nanoparticles with a size range of 5-10 nm were distributed almost uniformly on the surface of MWCNTs. The Ni/MWCNTs electrode has exhibited remarkably higher current density of 145 mA/cm2 and a lower onset potential of -0.3 V in 0.1M CH3OH with 0.1 M H2SO4. The calculated average active surface area of MWCNTs and Ni/ MWCNTsâ electrode are 0.45 x 10-3 cm2 and 0.51 x 10-3 cm2 respectively and the surface coverage of Ni/MWCNTsâ electrode was 2.4409Ã10-7 mol/cm2. A significant electrocatalytic activity of Ni/MWCNTs for the oxidation of methanol and ethanol in acidic medium has been observed, which could be a positive result to be harnessed as a non-noble electrocatalyst/electrode system to improve the efficiency of the direct alcohol fuel cells.
Krishnamurthy G has completed his MPhil and PhD from Bangalore University after his Master’s in the same University. He is having a total of 16 years of teaching experience. During his tenure as Sir C V Raman Post-doctoral Fellow (2013-2014), he visited Lawrence Berkely National Laboratory, Berkely, CA, US. His research interests lie in nano/energy materials, electrochemisty, bio-medical materials, etc. He has published 28 papers in reputed journals and guided PhD students. He is a reviewer of several reputed international journals.