Journal
ULTRASONICS SONOCHEMISTRY
Volume 40, Issue -, Pages 552-557Publisher
ELSEVIER
DOI: 10.1016/j.ultsonch.2017.07.048
Keywords
Sonochemistry; Electrocatalyst; Oxygen evolution reaction; Water electrolysis; Nanomaterial
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2016R1A2B4014012]
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In this work, we present facile synthesis of amorphous Ni/Fe mixed (oxy)hydroxide (NiFe(H)) nanoparticles (NPs) and their electrocatalytic performance for oxygen evolution reaction (OER) in alkaline media. a-NiFe(H) NPs have received lots of attention as OER electrocatalysts with many desirable properties. By using a simple sonochemical route, we prepared amorphous Ni and Fe-alkoxide (NiFe(A)) NPs whose composition can be controlled in the entire composition range (Ni100-xFex, 0 <= x <= 1). These samples are composed of extremely small NiFe(A) NPs with Ni and Fe atoms homogeneously distributed. NiFe(A) NPs are readily converted into corresponding electrocatalytically active NiFe(H) NP by a simple electrochemical treatment. Electrochemical analysis data show that the OER activity of amorphous NiFe(H) samples follows the volcano-type trend when plotted against the Fe content. Ni70Fe30(H) sample showed the lowest overpotential of 292 mV at 10 mA and the lowest Tafel slope of 30.4 mV dec(-1), outperforming IrOx/C (326 my, 41.7 mV dec(-1)). Our samples are highly durable based on the chronopotentiometry data at the current density of 10 mA cm(geo)(-2), for 2 h which show that Ni70Fe30 sample maintains the steady-state potential, contrary to the time-varying IrOx/C.
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