• 文献标题:   Electrocatalytic Activity of Nanocomposites of Sulphur Doped Graphene Oxide and Nanosized Cobalt Phthalocyanines
  • 文献类型:   Article
  • 作  者:   SHUMBA M, NYOKONG T
  • 作者关键词:   hydrogen peroxide, cobalt phthalocyanine, sulphur doped graphene oxide nanosheet, electrocatalysi
  • 出版物名称:   ELECTROANALYSIS
  • ISSN:   1040-0397 EI 1521-4109
  • 通讯作者地址:   Rhodes Univ
  • 被引频次:   7
  • DOI:   10.1002/elan.201600226
  • 出版年:   2016

▎ 摘  要

In this work we explore the electrocatalytic activity of nanocomposites of reduced sulphur doped graphene oxide nanosheets (rSDGONS) and cobalt phthalocyanine (CoPc) or cobalt tetra amino phthalocyanine (CoTAPc) towards hydrogen peroxide. Transmission electron microscopy, scanning electron microscopy, X-ray photon spectroscopy, X-ray diffraction, chronoamperometry, linear scan voltammetry and cyclic voltammetry were used to characterize the nanocomposites. Nanosized CoPc showed superior (in terms of currents) electrocatalytic oxidation and reduction of hydrogen peroxide compared to CoTAPc nanoparticles (CoTAPcNP). The lowest detection limit was obtained for hydrogen peroxide oxidation on electrodes modified with CoPcNP-rSDGONS at 1.49 mu M. The same electrode gave a high adsorption equilibrium constant of 1.27 x 10(3) mol(-1) and a Gibbs free energy of -17.71 kJ/mol, indicative of a spontaneous reaction on the electrode surface.