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Gold nanoparticle decoration of insulating boron nitride nanosheet on inert gold electrode toward an efficient electrocatalyst for the reduction of oxygen to water

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Title: Gold nanoparticle decoration of insulating boron nitride nanosheet on inert gold electrode toward an efficient electrocatalyst for the reduction of oxygen to water
Authors: Elumalai, Ganesan Browse this author
Noguchi, Hidenori Browse this author →KAKEN DB
Lyalin, Andrey Browse this author
Taketsugu, Tetsuya Browse this author →KAKEN DB
Uosaki, Kohei Browse this author →KAKEN DB
Keywords: Fuel cell
Boron nitride
Oxygen reduction reaction
Gold nanoparticle
Gold electrode
Issue Date: May-2016
Publisher: Elsevier
Journal Title: Electrochemistry Communications
Volume: 66
Start Page: 53
End Page: 57
Publisher DOI: 10.1016/j.elecom.2016.02.021
Abstract: Overpotential for oxygen reduction reaction (ORR) at Au electrode is reported to be reduced by 0.27 V by the modification with boron nitride nanosheet (BNNS) but oxygen is reduced only to H2O2 by 2-electron process at Au electrode. Here we demonstrate that the decoration of BNNS with gold nanoparticles (AuNP) not only reduces the overpotential for ORR further by ca. 50 mV, but also opens a 4-electron reduction route to water. Both rotating disk electrode experiments with Koutecky-Levich analysis and rotating ring disk electrode measurements show that more than 50% of oxygen is reduced to water via 4-electron process at Au-BNNS/Au electrode while less than 20 and 10% of oxygen are reduced to water at the BNNS/Au and bare Au electrodes, respectively. Theoretical analysis of free energy profiles for ORR at the BN monolayer with and without Au-8 cluster placed on Au(111) shows significant stabilization of adsorbed oxygen atom by the Au-8 cluster, opening a 4-electron reduction pathway.
Rights: © 2016, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/70064
Appears in Collections:総合化学院 (Graduate School of Chemical Sciences and Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 魚崎 浩平

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