Nitrogen Doped Reduced Graphene Oxide Based Pt–TiO2 Nanocomposites for Enhanced Hydrogen Evolution

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Materials Science Centre, Indian Institute of Technology, Kharagpur 721302, W. B., India
Department of Chemistry, University of Waterloo, Waterloo N2L 3G1, Ontario, Canada
*Phone: +91 3222 281798. Fax: +91 3222 282274. E-mail: [email protected]
Cite this: J. Phys. Chem. C 2015, 119, 33, 19117–19125
Publication Date (Web):July 27, 2015
https://doi.org/10.1021/acs.jpcc.5b03870
Copyright © 2015 American Chemical Society
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Abstract

Electrochemical hydrogen production from water is an attractive clean energy generation process that has enormous potential for sustainable development. However, noble metal catalysts are most commonly used for such electrochemical hydrogen evolution making the process cost ineffective. Thereby design of hybrid catalysts with minimal use of noble metals using a suitable support material is a prime requirement for the electrolysis of water. Herein, we demonstrate the superior hydrogen evolution reaction (HER) activity of the platinum nanoparticles (Pt NPs) supported on faceted titanium dioxide (TiO2) nanocrystals (Pt–TiO2) and nitrogen doped reduced graphene oxide (N-rGO) based TiO2 nanocomposite (Pt–TiO2–N-rGO). The ternary Pt–TiO2–N-rGO nanocomposite exhibits a superior HER activity with a small Tafel slope (∼32 mV·dec–1), exchange current density (∼0.22 mA·cm–2), and excellent mass activity (∼3116 mA·mgpt–1) at 300 mV overpotential. These values are better/higher than that of several support materials investigated so far. The excellent HER activity of the ternary Pt–TiO2–N-rGO nanocomposite is ascribed to the presence of Ti(III) states and enhanced charge transportation properties of N-rGO. The present study is a step toward reliable electrochemical hydrogen production using faceted TiO2 nanocrystals as support material.

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  • XPS surface survey, region spectra, EDX spectra, and cyclic voltammograms for HER (PDF)

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