Electrocatalytic water oxidation at neutral pH by a nanostructured Co(PO3)2 Anode

Hyun S. Ahn, T. Don Tilley

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221 Citations (Scopus)


Cobalt metaphosphate Co(PO3)2 nanoparticles are prepared via the thermolytic molecular precursor (TMP) method. A Ni form electrode decorated with Co(PO3)2 nanoparticles is evaluated as an anode for water oxidation electrocatalysis in pH 6.4 phosphate-buffered water. Catalytic onset occurs at an overpotential of ca. 310 mV, which is 100 mV lower than that observed for Co3O4 nanoparticles, with a comparable surface area under identical conditions. A per-metal turnover frequency (TOF) of 0.10-0.21 s-1 is observed at an overpotential, η, of 440 mV, which is comparable to the highest rate reported for a first-row metal heterogeneous catalyst. Post-catalytic characterization of the catalyst resting state by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy reveals that surface rearrangement occurs, resulting in an oxide-like surface overlayer. A nanostructured Co(PO3)2 is prepared by the thermolytic molecular precursor method and then drop-cast onto an anode to perform water oxidation at neutral pH at a rate of 0.21 s-1 and an overpotential of 440 mV. The catalytic onset overpotential is ca. 310 mV, which is 100 mV lower than that of comparable Co3O4 nanoparticles under identical conditions.

Original languageEnglish
Pages (from-to)227-233
Number of pages7
JournalAdvanced Functional Materials
Issue number2
Publication statusPublished - 2013 Jan 14

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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