Photocatalytic H2 production using Pt-TiO2 in the presence of oxalic acid: Influence of the noble metal size and the carrier gas flow rate

ákos Kmetykó, K. Mogyorósi, Viktória Gerse, Z. Kónya, Péter Pusztai, A. Dombi, K. Hernádi

Research output: Contribution to journalArticle

13 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)7022-7038
Number of pages17
JournalMaterials
Volume7
Issue number10
DOIs
Publication statusPublished - 2014

Fingerprint

Oxalic Acid
Oxalic acid
Precious metals
Flow of gases
Flow rate
Polymethyl Methacrylate
Photocatalysts
Sols
Nanoparticles
Irradiation
Platinum
Suspensions
Gases
Particle size
Decomposition
Catalysts
Experiments

Keywords

  • H production
  • Oxalic acid
  • Pt nanoparticles
  • Size dependent activity
  • TiO

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Photocatalytic H2 production using Pt-TiO2 in the presence of oxalic acid : Influence of the noble metal size and the carrier gas flow rate. / Kmetykó, ákos; Mogyorósi, K.; Gerse, Viktória; Kónya, Z.; Pusztai, Péter; Dombi, A.; Hernádi, K.

In: Materials, Vol. 7, No. 10, 2014, p. 7022-7038.

Research output: Contribution to journalArticle

@article{64f535a31eb84f9b9fa494f539ae88fe,
title = "Photocatalytic H2 production using Pt-TiO2 in the presence of oxalic acid: Influence of the noble metal size and the carrier gas flow rate",
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.",
keywords = "H production, Oxalic acid, Pt nanoparticles, Size dependent activity, TiO",
author = "{\'a}kos Kmetyk{\'o} and K. Mogyor{\'o}si and Vikt{\'o}ria Gerse and Z. K{\'o}nya and P{\'e}ter Pusztai and A. Dombi and K. Hern{\'a}di",
year = "2014",
doi = "10.3390/ma7107022",
language = "English",
volume = "7",
pages = "7022--7038",
journal = "Materials",
issn = "1996-1944",
publisher = "MDPI AG",
number = "10",

}

TY - JOUR

T1 - Photocatalytic H2 production using Pt-TiO2 in the presence of oxalic acid

T2 - Influence of the noble metal size and the carrier gas flow rate

AU - Kmetykó, ákos

AU - Mogyorósi, K.

AU - Gerse, Viktória

AU - Kónya, Z.

AU - Pusztai, Péter

AU - Dombi, A.

AU - Hernádi, K.

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - H production

KW - Oxalic acid

KW - Pt nanoparticles

KW - Size dependent activity

KW - TiO

UR - http://www.scopus.com/inward/record.url?scp=84920973805&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84920973805&partnerID=8YFLogxK

U2 - 10.3390/ma7107022

DO - 10.3390/ma7107022

M3 - Article

AN - SCOPUS:84920973805

VL - 7

SP - 7022

EP - 7038

JO - Materials

JF - Materials

SN - 1996-1944

IS - 10

ER -