Efficient Oxygen Reduction Electrocatalysts Based on Gold Nanocluster–Graphene Composites

Kyuju Kwak; Uday Pratap Azad; Woojun Choi; Kyunglim Pyo; Mi Jang; Dongil Lee

doi:10.1002/celc.201600154

Efficient Oxygen Reduction Electrocatalysts Based on Gold Nanocluster–Graphene Composites

Kyuju Kwak, Uday Pratap Azad, Woojun Choi, Kyunglim Pyo, Mi Jang, Dongil Lee

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

This paper describes the preparation and electrocatalytic activity of nanocomposites composed of reduced graphene oxide and Au₂₅ clusters. Well-defined nanocomposites are prepared by coating the surface of reduced graphene oxide with multiple layers of Au₂₅ film, the thickness of which can be precisely controlled according to the preparation conditions. The electrocatalytic activity of the nanocomposites are examined for the reduction of [Ru(NH₃)₆]³⁺ and in the oxygen reduction reaction by chronoamperometry and electrochemical impedance spectroscopy as a function of Au₂₅ thickness. Whereas the catalytic rate constants obtained for the reduction of [Ru(NH₃)₆]³⁺ are found to be rather constant with varying Au₂₅ thickness, those for the oxygen reduction reaction increased drastically with an increasing number of Au₂₅ layers. This increase can be ascribed to the porous structures generated in the nanocomposites. The porous channels generated in the nanocomposites offer confined space surrounded by electrified surface, greatly enhancing the electrocatalytic activity for the oxygen reduction reaction. Additional rotating disk electrode and rotating ring-disk electrode voltammetry show that the nanocomposites support an efficient four-electron reduction of oxygen.

Original language	English
Pages (from-to)	1253-1260
Number of pages	8
Journal	ChemElectroChem
Volume	3
Issue number	8
DOIs	https://doi.org/10.1002/celc.201600154
Publication status	Published - 2016 Aug 1

Bibliographical note

Funding Information:
This work was supported by a Korea CCS R&D Center (KCRC) grant (NRF-2014M1A8A1074219), the National Research Foundation of Korea (NRF-2014R1A2A1A11051032 and 2009–0093823), and the Yonsei University Future-leading Research Initiative of 2014. We thank Professor Youngmi Lee (Ewha Womans University) and Professor Moonhyun Oh (Yonsei University) for providing access to the RRDE and the surface area measuring system, respectively.

Publisher Copyright:
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

All Science Journal Classification (ASJC) codes

Catalysis
Electrochemistry

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10.1002/celc.201600154

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title = "Efficient Oxygen Reduction Electrocatalysts Based on Gold Nanocluster–Graphene Composites",

abstract = "This paper describes the preparation and electrocatalytic activity of nanocomposites composed of reduced graphene oxide and Au25 clusters. Well-defined nanocomposites are prepared by coating the surface of reduced graphene oxide with multiple layers of Au25 film, the thickness of which can be precisely controlled according to the preparation conditions. The electrocatalytic activity of the nanocomposites are examined for the reduction of [Ru(NH3)6]3+ and in the oxygen reduction reaction by chronoamperometry and electrochemical impedance spectroscopy as a function of Au25 thickness. Whereas the catalytic rate constants obtained for the reduction of [Ru(NH3)6]3+ are found to be rather constant with varying Au25 thickness, those for the oxygen reduction reaction increased drastically with an increasing number of Au25 layers. This increase can be ascribed to the porous structures generated in the nanocomposites. The porous channels generated in the nanocomposites offer confined space surrounded by electrified surface, greatly enhancing the electrocatalytic activity for the oxygen reduction reaction. Additional rotating disk electrode and rotating ring-disk electrode voltammetry show that the nanocomposites support an efficient four-electron reduction of oxygen.",

author = "Kyuju Kwak and Azad, {Uday Pratap} and Woojun Choi and Kyunglim Pyo and Mi Jang and Dongil Lee",

note = "Funding Information: This work was supported by a Korea CCS R&D Center (KCRC) grant (NRF-2014M1A8A1074219), the National Research Foundation of Korea (NRF-2014R1A2A1A11051032 and 2009–0093823), and the Yonsei University Future-leading Research Initiative of 2014. We thank Professor Youngmi Lee (Ewha Womans University) and Professor Moonhyun Oh (Yonsei University) for providing access to the RRDE and the surface area measuring system, respectively. Publisher Copyright: {\textcopyright} 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

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AU - Jang, Mi

AU - Lee, Dongil

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PY - 2016/8/1

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N2 - This paper describes the preparation and electrocatalytic activity of nanocomposites composed of reduced graphene oxide and Au25 clusters. Well-defined nanocomposites are prepared by coating the surface of reduced graphene oxide with multiple layers of Au25 film, the thickness of which can be precisely controlled according to the preparation conditions. The electrocatalytic activity of the nanocomposites are examined for the reduction of [Ru(NH3)6]3+ and in the oxygen reduction reaction by chronoamperometry and electrochemical impedance spectroscopy as a function of Au25 thickness. Whereas the catalytic rate constants obtained for the reduction of [Ru(NH3)6]3+ are found to be rather constant with varying Au25 thickness, those for the oxygen reduction reaction increased drastically with an increasing number of Au25 layers. This increase can be ascribed to the porous structures generated in the nanocomposites. The porous channels generated in the nanocomposites offer confined space surrounded by electrified surface, greatly enhancing the electrocatalytic activity for the oxygen reduction reaction. Additional rotating disk electrode and rotating ring-disk electrode voltammetry show that the nanocomposites support an efficient four-electron reduction of oxygen.

AB - This paper describes the preparation and electrocatalytic activity of nanocomposites composed of reduced graphene oxide and Au25 clusters. Well-defined nanocomposites are prepared by coating the surface of reduced graphene oxide with multiple layers of Au25 film, the thickness of which can be precisely controlled according to the preparation conditions. The electrocatalytic activity of the nanocomposites are examined for the reduction of [Ru(NH3)6]3+ and in the oxygen reduction reaction by chronoamperometry and electrochemical impedance spectroscopy as a function of Au25 thickness. Whereas the catalytic rate constants obtained for the reduction of [Ru(NH3)6]3+ are found to be rather constant with varying Au25 thickness, those for the oxygen reduction reaction increased drastically with an increasing number of Au25 layers. This increase can be ascribed to the porous structures generated in the nanocomposites. The porous channels generated in the nanocomposites offer confined space surrounded by electrified surface, greatly enhancing the electrocatalytic activity for the oxygen reduction reaction. Additional rotating disk electrode and rotating ring-disk electrode voltammetry show that the nanocomposites support an efficient four-electron reduction of oxygen.

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Efficient Oxygen Reduction Electrocatalysts Based on Gold Nanocluster–Graphene Composites

Abstract

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