Pd Octahedral and Spherical Nanocrystals Supported on Crumpled Graphene Oxide: Their Comparative Studies for Electrocatalytic Applications

  • Majid Khan Department of Physics, Abdul Wali Khan University, Mardan 23200, Pakistan
  • Ammar Bin Yousaf Hefei National Laboratory for Physical Sciences at Microscale, Department of Nano Chemistry, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, China
  • Muhammad Imran Hefei National Laboratory for Physical Sciences at Microscale, Department of Nano Chemistry, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, China
DOI: https://doi.org/10.14447/jnmes.v19i3.308

Abstract

Palladium (Pd) octahedral and spherical nanocrystals (NCs) were successfully synthesized on crumpled graphene oxide (GO) by surface adsorption of H2 and CO in the presence of capping agent poly(vinylypyrrolidone) (PVP). Their comparative studies as anode material for direct methanol fuel cells (DMFCs) have been measured by hydrogen evolution reaction (HER) performance and methanol oxidation reaction (MOR) activity. The electrocatalytic properties of both the nanocrystals were studied in HClO4 acidic media and com-pared with each other. Pd octahedral nanocrystals have shown the best performance as an anode material, their onset potential for evolu-tion of hydrogen from the active sites of the catalyst is more towards zero than the spherical NCs. The observed specific activity (ca. 4.3 mA.cm-2) and mass activity (ca. 5300 mA.mg-1) of Pd towards MOR is much higher for octahedral NCs than that of spherical NCs.

Published
2016-08-30
Issue
Vol 19 No 3 (2016): pages 117-179
Section
Full Articles

This paper has not been published before. Upon its acceptance for publication in the Journal, I, as the only senior author, agree to transfer (to the extent transferable, if I am a Government employee) to the Journal of New Materials for Electrochemical Systems, or its assignee, all the rights under the existing Copyright laws, except for the following, which the author(s) specifically retain(s):

  • the right to make further copies of all or part of the published article for my use in classroom teaching;
  • the right to re-use all or part of the material in a compilation of my own words, or in a textbook of which I am the author;
  • the right to make copies of the published work for internal distribution within the institution which employs me.

 

I agree to inform my co-authors, if any, of the terms of this arrangement.