Electrocatalytic Activity of Au/tio2 Nanocomposites in Oxygen Electroreduction Reaction

  1. E. A. Ovodok
  2. M. I. Ivanovskaya
  3. S. K. Poznyak
  4. A. M. Mal'tanova
  5. S. V. Voitekhovich
  6. T. V. Gaevskaya
  7. A. E. Seleznev
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Abstract

Herein, Au NPs/TiO 2 composites were obtained by adding an aqueous solution of HAuCl 4 or pre-synthesized gold nanoparticle (Au NP) sols to the TiO 2 sol, followed by annealing the films deposited on a substrate. The size of Au NPs, structural features of Au/TiO 2 composites, their surface modification with different functional groups and the interaction between Au NPs and TiO 2 matrix were studied by TEM, XPS, and FTIR. The activity of bare TiO 2 and Au NPs/TiO 2 films was evaluated in electrochemical oxygen reduction reaction (ORR). The influence of Au NPs size, concentration and chemical state of gold on improving electrocatalytic properties of Au/TiO 2 films in ORR is shown. Doping the TiO 2 matrix with tetrazole-stabilized Au NPs of about 2 nm size leads to a significant reduction in overvoltage and the appearance of an additional Au-assisted wave on cyclic voltammograms. The high activity of these Au/TiO 2 electrodes can be explained by the small size of Au NPs and the excessive negative charge on them.

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  1. Version published to 10.21203/rs.3.rs-8246742/v1 on Research Square