Issue 10, 2015
From the journal:

Journal of Materials Chemistry A

Highly branched cobalt phosphide nanostructures for hydrogen-evolution electrocatalysis†

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

* Corresponding authors

a Department of Chemistry and Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA
E-mail: res20@psu.edu

b Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
E-mail: nslewis@caltech.edu

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.

Graphical abstract: Highly branched cobalt phosphide nanostructures for hydrogen-evolution electrocatalysis

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Article information

DOI
https://doi.org/10.1039/C4TA06642A
Article type
Paper
Submitted
03 Dec 2014
Accepted
15 Jan 2015
First published
16 Jan 2015

J. Mater. Chem. A, 2015,3, 5420-5425

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Highly branched cobalt phosphide nanostructures for hydrogen-evolution electrocatalysis

E. J. Popczun, C. W. Roske, C. G. Read, J. C. Crompton, J. M. McEnaney, J. F. Callejas, N. S. Lewis and R. E. Schaak, J. Mater. Chem. A, 2015, 3, 5420 DOI: 10.1039/C4TA06642A

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