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Photoelectrocatalytic activity of Zn-loaded RGO-TiO2 composite coatings on mild steel substrate via DC electrochemical co-deposition

Published online by Cambridge University Press:  03 February 2014

Rakibul Hasan ,
Chin Wei Lai ,
Sharifah Bee Abd Hamid ,
Wan Jeffrey Basirun ,
Zainovia Lockman  and
Fazlul Bari
Rakibul Hasan
Affiliation:
Nanotechnology and Catalysis Research Centre (NANOCAT), University of Malaya, Level 3, Block A, Institute of Postgraduate Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia
Chin Wei Lai*
Affiliation:
Nanotechnology and Catalysis Research Centre (NANOCAT), University of Malaya, Level 3, Block A, Institute of Postgraduate Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia
Sharifah Bee Abd Hamid*
Affiliation:
Nanotechnology and Catalysis Research Centre (NANOCAT), University of Malaya, Level 3, Block A, Institute of Postgraduate Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia
Wan Jeffrey Basirun
Affiliation:
Nanotechnology and Catalysis Research Centre (NANOCAT), University of Malaya, Level 3, Block A, Institute of Postgraduate Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia
Zainovia Lockman
Affiliation:
School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia Engineering Campus, 14300 Nibong Tebal, Seberang Perai Selatan, Pulau Pinang, Malaysia
Fazlul Bari
Affiliation:
School of Materials Engineering Universiti Malaysia Perlis (UniMAP), Taman Muhibbah, 02600 Arau, Perlis, Malaysia
*
ae-mail: cwlai@um.edu.my
be-mail: sharifahbee@um.edu.my
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Abstract

The photoelectrocatalytic activity of Zn-loaded reduced graphene oxide-titania (RGO-TiO2) composite coatings on mild steel substrate was investigated in detail. Zn-loaded RGO-TiO2 composite films were prepared by using DC electrochemical co-deposition technique onto mild steel substrate in an acid-sulphate bath electrolyte. The cyclic voltammetry and photocurrent response studies showed that the Zn-loaded RGO-TiO2 films have improved photoelectrocatalytic performance. The embedding of metallic Zn into the RGO-TiO2 promoted an effective charge carriers separation by minimizing the recombination losses. In this manner, metallic Zn will act as efficient photo-induced electron acceptors from the bulk of RGO-TiO2 film. Thus, the transportation of the electrons from the working electrode to the counter electrode was improved significantly.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 65 , Issue 2 , February 2014 , 20303
Copyright
© EDP Sciences, 2014

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