Engineering of Highly Active Silver Nanoparticles for Oxygen Electroreduction via Simultaneous Control over Their Shape and Size. (20th November 2017)

• Record Type: Journal Article
• Authors: Garlyyev, Batyr; Liang, Yunchang; Butt, Faheem K.; Bandarenka, Aliaksandr S.
• Is Part Of: Advanced sustainable systems. Volume 1:Number 12(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-11-20
• Subjects: electrocatalysis -- oxygen depolarized cathodes -- oxygen reduction reaction -- shape and size catalytic effects -- silver nanoparticles; Sustainable living -- Periodicals; Sustainability -- Periodicals; Green technology -- Periodicals; Periodicals; 628
• DOI: 10.1002/adsu.201700117
• Languages: English
• ISSNs: 2366-7486

Abstract

Abstract: The oxygen reduction reaction (ORR) is one of the most important electrocatalytic reactions, which requires efficient and economically viable electrocatalysts. While Pt(Pd)‐based catalysts show the best ORR performance for automotive applications, their use in large‐scale industrial processes, for instance at the oxygen depolarized cathodes in chloralkali industry, is questionable due to the high cost of Pt(Pd). Silver, being much more affordable than platinum, is known as the "second‐active" ORR electrocatalyst in alkaline media. Shape‐selected Ag nanoplates of three different sizes are synthesized using a one‐step bottom‐up approach. With no alloying, optimal Ag nanoplates show specific activity of ≈2.6 mA cm −2 (3 times higher than Ag (110)) and mass activity of ≈ 114 A g Ag − 1 (6.5 times higher compared to state‐of‐the‐art Ag nanospheres) toward ORR at 0.8 V versus reversible hydrogen electrode. These activities are the highest reported in the literature for pure Ag electrocatalysts (both single crystalline and nanostructured) measured under similar conditions. Abstract : Highly active Ag nanoplates for oxygen reduction reaction in alkaline solution are prepared with one‐pot synthesis. Without alloying and by only tailoring the size/shape of nanoparticles, high activities are observed: Ag nanoplates show specific activity of ≈2.6 mA cm −2 (3 times higher than Ag(110), state‐of‐the‐art Ag single crystal) and mass activity of ≈ 114 A g Ag − 1 (6.5 times higher compared to state‐of‐the‐art Ag nanospheres) toward oxygen reduction reaction in 0.1m KOH.