Core–Shell Au@Metal-Oxide Nanoparticle Electrocatalysts
for Enhanced Oxygen Evolution
Alaina
L. Strickler
Marı́a Escudero-Escribano
Thomas F. Jaramillo
10.1021/acs.nanolett.7b02357.s001
https://acs.figshare.com/articles/journal_contribution/Core_Shell_Au_Metal-Oxide_Nanoparticle_Electrocatalysts_for_Enhanced_Oxygen_Evolution/5437495
Enhanced 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@M<sub><i>x</i></sub>O<sub><i>y</i></sub> 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@CoFeO<sub><i>x</i></sub>, demonstrate an overpotential
of 328 ± 3 mV over a 2 h stability test at 10 mA cm<sup>–2</sup>, 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.
2017-09-25 16:54:00
surface area
Enhanced Oxygen Evolution Enhanced catalysis
water electrolyzers
transition metal-oxide
metal-oxide effects
core
activity particles
2 h stability test
oxygen evolution reaction
Au-core
electrochemical oxygen evolution
device-ready
OER catalysts
metal-oxide shell
transition metal-oxide nanoparticles
energy technologies
activity enhancement