Electrocatalysis and bioelectrocatalysis and nanostructured composite films

Paweł J. Kulesza 

Warsaw University, Faculty of Chemistry, Pasteura 1, Warszawa 02-093, Poland

Abstract

We pursue here the concept of protecting and activating of Pt and Ru-Se nanoparticles by coating them with Keggin type phosphododecamolybdate or phosphododecatungstate, the well-defined oxygen-bridged metal clusters related to the parent tungsten and molybdenum oxides. In addition to the changes in morphology, the increased dispersion, as well as to the bifunctional nature of their reactivity, the polyoxometallate stabilized Pt nanoparticles are characterized by a broader potential window where platinum metal is not covered by the inhibiting PtO oxides. In the case of Ru-Se clusters, modification of their surfaces results in diminishing of their size and leads to the lowering of background currents in the potential range where the oxygen reduction reaction is operative. Recently, there has also been growing interest in biofuel cells that can be viewed as analogues of conventional fuel cells except that they typically utilize biocatalysts (enzymes), biofules, and neutral or slightly acidic electrolytes. While oxygen serves as a cathode fuel, glucose, lactate or ethanol can be considered as anode fuels. The possibility of use of carbon nanostructures will be discussed. The concept of fabrication of the phosphomolybdate-stabilized colloidal suspensions of metal particles is extended here to the formation of the analogous dispersions of carbon nanoparticles and multi-walled carbon nanotubes and utilized to the generation of network films of conducting polymer linked carbon nanostructures on electrode substrates. The research is not only of importance to the construction of effectively operating charge storage devices (capacitors) but also charge mediators (relays), chemical and biochemical sensing devices, as well as electrocatalytic systems.

 

Related papers
  1. Development of multifunctional bioelectrocatalytic films for oxidation of ethanol   
  2. Integrated carbon nanotube based mediating systems for bioelectrocatalysis: application to oxygen reduction and glucose oxidation
  3. Preparation of copper hexacyanoferrate multilayer films modified with 4-(Pyrrole-1-yl) benzoic acid on glassy carbon electrode.
  4. Development of electrocatalytic materials based on the mixed addenda Dawson heteropolyanion and conducting polymers
  5. Development of novel bioelectrocatalytic systems through controlled combination of multiwalled carbon nanotubes, redox mediators and enzymes
  6. Oxidation of glucose at nanostructured composite bioelectrocatalytic systems
  7. Application of Inorganic Redox - Conducting Solids As Charge Relays in Dye-Sensitized Solar Cell
  8. Bi-functional electrocatalytic systems for oxygen reduction in acid medium
  9. Incorporation of RuSex/C within nanostructural Ir matrices to enhance oxygen reduction
  10. Electrochemical charging of carbon nanotubes modified with polyoxometallates monolayers
  11. Enzymatic carbon nanotube based composite electrodes for dioxygen reduction
  12. Multifunctional bio-electrocatalytic systems for reduction of oxygen and hydrogen peroxide
  13. Electrocatalysis and Bioelectrocatalysis at Network Films of Metal Nanoparticles and Carbon Nanostructures
  14. Bioelectrocatalytic dioxygen reduction at carbon nanotubes – silicate composite film modified electrode
  15. Development and characterization of bioelectrocatalytic systems for oxygen reduction
  16. Activation of Methanol-Tolerant Carbon-Supported RuSex Electrocatalytic Nanoparticles Towards More Efficient Oxygen Reduction
  17. New strategies in the electroctalytic reduction of oxygen for fuel and biofuel cells
  18. Polyoxometallate-modified conducting polymer linked Pt nanoparticles as bifunctional electrocatalysts for bromate reduction
  19. Network Films of Conducting Polymer Linked and Polymeatallate Stabilized Platinum Nanoparticles

Presentation: Invited oral at E-MRS Fall Meeting 2006, Symposium A, by Paweł J. Kulesza
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-21 22:08
Revised:   2009-06-07 00:44