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Hydrogen evolution reaction measurements of dealloyed porous NiCu

Kyla R Koboski1, Evan F Nelsen12 and Jennifer R Hampton1*

Author Affiliations

1 Department of Physics, Hope College, Holland, MI 49423, USA

2 Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA

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Nanoscale Research Letters 2013, 8:528  doi:10.1186/1556-276X-8-528

Published: 17 December 2013

Abstract

Porous metals are of interest for their high surface area and potential for enhanced catalytic behavior. Electrodeposited NiCu thin films with a range of compositions were electrochemically dealloyed to selectively remove the Cu component. The film structure, composition, and reactivity of these samples were characterized both before and after the dealloying step using scanning electron microscopy, energy-dispersive spectroscopy, and electrochemical measurements. The catalytic behavior of the dealloyed porous Ni samples towards the hydrogen evolution reaction was measured and compared to that of the as-deposited samples. The dealloyed samples were generally more reactive than their as-deposited counterparts at low overpotentials, making the dealloying procedure a promising area of exploration for improved hydrogen evolution catalysts.

Keywords:
Dealloying; Alloy; NiCu; Ni; Cu; Hydrogen evolution reaction