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Engineering of Highly Active Silver Nanoparticles for Oxygen Electroreduction via Simultaneous Control over Their Shape and Size
Author(s) -
Garlyyev Batyr,
Liang Yunchang,
Butt Faheem K.,
Bandarenka Aliaksandr S.
Publication year - 2017
Publication title -
advanced sustainable systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.499
H-Index - 24
ISSN - 2366-7486
DOI - 10.1002/adsu.201700117
Subject(s) - electrocatalyst , catalysis , platinum , nanoparticle , oxygen reduction , platinum nanoparticles , oxygen , oxygen reduction reaction , chemical engineering , materials science , nanotechnology , electrochemistry , chemistry , cathode , electrode , inorganic chemistry , organic chemistry , engineering
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.