Highly branched cobalt phosphide nanostructures for hydrogen-evolution electrocatalysis

Eric J. Popczun, Christopher W. Roske, Carlos G. Read, J. Chance Crompton, Joshua M. McEnaney, Juan F. Callejas, Nathan S. Lewis, Raymond E. Schaak

Research output: Contribution to journalArticlepeer-review

101 Scopus citations


CoP nanostructures that exposed predominantly (111) crystal facets were synthesized and evaluated for performance as electrocatalysts for the hydrogen-evolution reaction (HER). The branched CoP nanostructures were synthesized by reacting cobalt(ii) acetylacetonate with trioctylphosphine in the presence of trioctylphosphine oxide. Electrodes comprised of the branched CoP nanostructures deposited at a loading density of ∼1 mg cm-2 on Ti electrodes required an overpotential of -117 mV to produce a current density of -20 mA cm-2 in 0.50 M H2SO4. Hence the branched CoP nanostructures belong to the growing family of highly active non-noble-metal HER electrocatalysts. Comparisons with related CoP systems have provided insights into the impact that shape-controlled nanoparticles and nanoparticle-electrode interactions have on the activity and stability of nanostructured HER electrocatalysts.

Original languageEnglish (US)
Pages (from-to)5420-5425
Number of pages6
JournalJournal of Materials Chemistry A
Issue number10
StatePublished - Mar 14 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)


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