Probing Reactive Oxygen Species on Boron-Doped Diamond Anodes

Work performed at the University of Illinois at Urbana-Champaign (JCESR partner) by M.J. Counihan, W. Setwipatanachai and J. Rodríguez-López. ChemElectroChem, 2019.

Scientific Achievement

Multiple surface oxygen species form and react at different rates on sp2 carbon-containing boron-doped diamond electrodes during water oxidation.

Significance and Impact

A new experimental approach allows dynamic probing of reactive species on electrode surfaces and easy discrimination between multiple surface species.

Research Details

  • Scanning electrochemical microscopy (SECM) was used to quantify the surface coverage of surface-bound oxygen species during water oxidation. A new experimental protocol and theory quantitatively describe how these species evolve over time.
  • The surface coverage and formation rates of these two intermediates depends on pH and electrode potential. The reactive oxygen species that are evolved from the surface are also strongly pH-, potential-, surface chemistry-, and electrolyte-dependent.

DOI: 10.1002/celc.201900659

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