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Core–Shell Au@Metal-Oxide Nanoparticle Electrocatalysts for Enhanced Oxygen Evolution
journal contribution
posted on 2017-09-25, 16:54 authored by Alaina
L. Strickler, Marı́a Escudero-Escribano, Thomas F. JaramilloEnhanced catalysis for electrochemical
oxygen evolution is essential
for the efficacy of many renewable energy technologies, including
water electrolyzers and metal–air batteries. Recently, Au supports
have been shown to enhance the activity of many 3d transition metal-oxide
thin films for the oxygen evolution reaction (OER) in alkaline media.
Herein, we translate the beneficial impact of Au supports to high
surface area, device-ready core–shell nanoparticles consisting
of a Au-core and a metal-oxide shell (Au@MxOy where M = Ni, Co, Fe, and CoFe). Through
a systematic evaluation, we establish trends in performance and illustrate
the universal activity enhancement when employing the Au-core in the
3d transition metal-oxide nanoparticles. The highest activity particles,
Au@CoFeOx, demonstrate an overpotential
of 328 ± 3 mV over a 2 h stability test at 10 mA cm–2, illustrating that strategically coupling Au support and mixed metal-oxide
effects in a core–shell nanoparticle morphology is a promising
avenue to achieve device-ready, high-performance OER catalysts.
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Keywords
surface areaEnhanced Oxygen Evolution Enhanced catalysiswater electrolyzerstransition metal-oxidemetal-oxide effectscoreactivity particles2 h stability testoxygen evolution reactionAu-coreelectrochemical oxygen evolutiondevice-readyOER catalystsmetal-oxide shelltransition metal-oxide nanoparticlesenergy technologiesactivity enhancement
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