Cisplatin adducts of DNA as precursors for nanostructured catalyst materials

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Abstract

The synthesis and characterisation of novel metal-modified DNA precursors for fuel cell catalyst development are described. Material precursors in the form of metal-DNA complexes were prepared through the reaction of DNA with cisplatin at various loadings and spectroscopically tested to confirm the platinum binding mode and the degree of complexation. The surface morphology of the DNA-metal material was analysed by Scanning Transmission Electron Microscopy (STEM), which revealed the extent of platinum nanocluster formation, with low metal loadings leading to observation of individual platinum atoms. Electrochemical measurements showed a greater electrocatalytic activity for the hydrogen evolution reaction (HER) with increased platinum loadings, shifting the half wave potential, E1/2, away from the glassy carbon limit towards that of a bulk Pt electrode. This is explained further by Tafel plots, from which a change in the mechanism of the apparent rate limiting step for proton reduction from a Volmer to a Heyrovsky mechanism is postulated as the platinum loading increases. This journal is

Original languageEnglish
Pages (from-to)4491-4497
Number of pages7
JournalNanoscale Advances
Volume2
Issue number10
Early online date24 Aug 2020
DOIs
Publication statusPublished - 24 Aug 2020

ASJC Scopus subject areas

  • Engineering(all)
  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Chemistry(all)

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