Next Article in Journal
Decomposition of Cyclohexane on Ni3Al Thin Foil Intermetallic Catalyst
Next Article in Special Issue
Photocatalytic H2 Evolution Using Different Commercial TiO2 Catalysts Deposited with Finely Size-Tailored Au Nanoparticles: Critical Dependence on Au Particle Size
Previous Article in Journal
Suppression of 3C-Inclusion Formation during Growth of 4H-SiC Si-Face Homoepitaxial Layers with a 1° Off-Angle
Previous Article in Special Issue
Benzylpyrazinium Salts as Photo-Initiators in the Polymerization of Epoxide Monomers
Article Menu

Export Article

Open AccessArticle
Materials 2014, 7(10), 7022-7038; doi:10.3390/ma7107022

Photocatalytic H2 Production Using Pt-TiO2 in the Presence of Oxalic Acid: Influence of the Noble Metal Size and the Carrier Gas Flow Rate

1
Research Group of Environmental Chemistry, Institute of Chemistry, Faculty of Sciences and Informatics, University of Szeged, H-6720 Szeged, Tisza L. krt. 103., Hungary
2
Department of Applied and Environmental Chemistry, Faculty of Sciences and Informatics, University of Szeged, H-6720 Szeged, Rerrich tér 1., Hungary
*
Author to whom correspondence should be addressed.
Received: 4 August 2014 / Revised: 11 September 2014 / Accepted: 10 October 2014 / Published: 17 October 2014
(This article belongs to the Special Issue Photocatalytic Materials)
View Full-Text   |   Download PDF [968 KB, uploaded 17 October 2014]   |  

Abstract

The primary objective of the experiments was to investigate the differences in the photocatalytic performance when commercially available Aeroxide P25 TiO2 photocatalyst was deposited with differently sized Pt nanoparticles with identical platinum content (1 wt%). The noble metal deposition onto the TiO2 surface was achieved by in situ chemical reduction (CRIS) or by mixing chemically reduced Pt nanoparticle containing sols to the aqueous suspensions of the photocatalysts (sol-impregnated samples, CRSIM). Fine and low-scale control of the size of resulting Pt nanoparticles was obtained through variation of the trisodium citrate concentration during the syntheses. The reducing reagent was NaBH4. Photocatalytic activity of the samples and the reaction mechanism were examined during UV irradiation (λmax = 365 nm) in the presence of oxalic acid (50 mM) as a sacrificial hole scavenger component. The H2 evolution rates proved to be strongly dependent on the Pt particle size, as well as the irradiation time. A significant change of H2 formation rate during the oxalic acid transformation was observed which is unusual. It is probably regulated both by the decomposition rate of accumulated oxalic acid and the H+/H2 redox potential on the surface of the catalyst. The later potential is influenced by the concentration of the dissolved H2 gas in the reaction mixture. View Full-Text
Keywords: TiO2; H2 production; Pt nanoparticles; size dependent activity; oxalic acid TiO2; H2 production; Pt nanoparticles; size dependent activity; oxalic acid
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Kmetykó, Á.; Mogyorósi, K.; Gerse, V.; Kónya, Z.; Pusztai, P.; Dombi, A.; Hernádi, K. Photocatalytic H2 Production Using Pt-TiO2 in the Presence of Oxalic Acid: Influence of the Noble Metal Size and the Carrier Gas Flow Rate. Materials 2014, 7, 7022-7038.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top