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Enhancing oxygen reduction reaction activity and stability of platinum via oxide-carbon composites

Paper ID Volume ID Publish Year Pages File Format Full-Text
54993 47036 2013 8 PDF Available
Title
Enhancing oxygen reduction reaction activity and stability of platinum via oxide-carbon composites
Abstract

A series of oxide-carbon composites using three different oxides (TiO2, SnO2, ZnO) has been prepared using sol–gel (SG) and/or precipitation (P) chemical methods. A selective platinum deposition onto the oxide sites to obtain Pt/TiO2-C, Pt/SnO2-C and Pt/ZnO-C was carried out by generating electron–hole pairs on the oxide under UV-irradiation. This process takes advantage of the photogenerated electron on the oxide in the composite to reduce noble metal anions [PtCl6]2− to Pt0 in the presence of a sacrificial electron donor. The Pt/oxide-carbon materials were characterized by XRD, TEM and CO stripping voltammetry combined with in situ infrared reflection absorption spectroscopy (FTIRS). The electrochemical stability of the different Pt/oxide-C catalysts was investigated by cyclic voltammetry in sulfuric acid medium and their electrochemical activity was evaluated in the oxygen reduction reaction (ORR) at RT. The Pt/oxide-carbon materials showed higher ORR activity than Pt/C catalyst. In situ FTIR spectroscopy coupled with CO stripping voltammetry reveals that CO oxidation on Pt/TiO2-C and Pt/SnO2-C samples takes place at lower electrode potentials as compared to Pt/C. Under the same conditions, the electrochemical stability of platinum center is higher on TiO2-C and SnO2-C composites than ZnO-C and C substrates.

Graphical abstractA series of oxide-carbon composites using three different oxides (TiO2, SnO2, ZnO) has been prepared using sol–gel (SG) and/or precipitation (P) chemical methods onto which platinum was selectively photo-deposited.Figure optionsDownload full-size imageDownload high-quality image (105 K)Download as PowerPoint slideHighlights► Oxide-carbon composites served as catalyst substrate for oxygen reduction in acid medium. ► FTIR spectroscopy coupled with CO stripping voltammetry revealed that CO oxidation on Pt/TiO2-C and Pt/SnO2-C electrode takes place at lower electrode potentials. ► The electrochemical stability of platinum center is high on TiO2-C and SnO2-C.

Keywords
Pt nanoparticles; SnO2; TiO2; ZnO; Oxide-carbon; Composites; Photo-deposition; ORR; FTIRS
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Enhancing oxygen reduction reaction activity and stability of platinum via oxide-carbon composites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 202, 15 March 2013, Pages 36–43
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us