Volume 46, Issue 4 pp. 5200-5214
RESEARCH ARTICLE

Pulsed-UV illumination on graphene oxide: A new strategy in photocatalytic synthesis of electrocatalysts to control the structural and electrochemical properties

Navid Haghmoradi

Navid Haghmoradi

Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul, Turkey

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Zahide Tuğba Sarı

Zahide Tuğba Sarı

Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Milan, Italy

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Emre Utku Öztürk

Emre Utku Öztürk

Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul, Turkey

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Siddhartha Peri

Siddhartha Peri

Department of Chemical and Biomolecular Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois, USA

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Sina Abdolhosseinzadeh

Sina Abdolhosseinzadeh

Laboratory for Functional Polymers, Swiss Federal Laboratories for Materials Science and Technology (Empa), Dübendorf, Switzerland

Institute of Materials Science and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland

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Begüm Yarar Kaplan

Begüm Yarar Kaplan

Sabanci University SUNUM Nanotechnology Research Centre, Istanbul, Turkey

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Selmiye Alkan Gürsel

Corresponding Author

Selmiye Alkan Gürsel

Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul, Turkey

Sabanci University SUNUM Nanotechnology Research Centre, Istanbul, Turkey

Correspondence

Selmiye Alkan Gürsel, Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul 34956, Turkey.

Email: [email protected]

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First published: 30 November 2021
Citations: 2

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Summary

This study demonstrated the capability of a novel method in controlling the structural and electrochemical properties of electrocatalysts, utilizing a pulsed-ultraviolet (UV) setup for the synthesis procedure. A hand-made reactor provided a new set of parameters. The variation of UVon and UVoff periods resulted in samples with a range of different structures, compositions, and activities. Graphene/Pt was prepared with varying forms of illumination pulse, and its hydrogen oxidation and oxygen reduction reaction performances were evaluated. Controlling the reduction degree of Pt ions on partially reduced graphene oxide was achieved by manipulating the setup design. The results revealed a dominant growth and agglomeration phase of Pt particles, mostly with metallic states, by increasing both UVon and Uoff time spontaneously. Long UVon without adequate UVoff did not result in promising electrocatalytic activities. In other words, different structures, compositions, and activities of samples suggested that not just the illumination is the crucial factor, it is also the resting time or UVoff which determines the surface adsorption kinetics, nucleation sites, and growth mechanism of nanoparticles. Further chemical reduction by highly concentrated ascorbic acid was used to confirm the proposed mechanisms, which lead to samples even with more metallic Pt (Pt0).

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