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

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Abstract

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
Pages (from-to)5420-5425
Number of pages6
JournalJournal of Materials Chemistry A
Volume3
Issue number10
DOIs
Publication statusPublished - Mar 14 2015

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ASJC Scopus subject areas

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

Cite this

Popczun, E. J., Roske, C. W., Read, C. G., Crompton, J. C., McEnaney, J. M., Callejas, J. F., Lewis, N. S., & Schaak, R. E. (2015). Highly branched cobalt phosphide nanostructures for hydrogen-evolution electrocatalysis. Journal of Materials Chemistry A, 3(10), 5420-5425. https://doi.org/10.1039/c4ta06642a