TY - JOUR AU - Kmetykó, Ákos AU - Ádám, Szániel AU - Christos, Tsakiroglou AU - Dombi, András AU - Hernádi, Klára TI - Enhanced photocatalytic H2 generation on noble metal modified TiO2 catalysts excited with visible light irradiation JF - REACTION KINETICS MECHANISMS AND CATALYSIS J2 - REACT KINET MECH CATAL VL - 117 PY - 2016 IS - 1 SP - 379 EP - 390 PG - 12 SN - 1878-5190 DO - 10.1007/s11144-015-0923-3 UR - https://m2.mtmt.hu/api/publication/2931588 ID - 2931588 LA - English DB - MTMT ER - TY - JOUR AU - Kmetykó, Ákos AU - Mogyorósi, Károly AU - Pusztai, Péter AU - Radu, Teodora AU - Kónya, Zoltán AU - Dombi, András AU - Hernádi, Klára TI - Photocatalytic H-2 Evolution Using Different Commercial TiO2 Catalysts Deposited with Finely Size-Tailored Au Nanoparticles: Critical Dependence on Au Particle Size JF - MATERIALS J2 - MATERIALS VL - 7 PY - 2014 IS - 12 SP - 7615 EP - 7633 PG - 19 SN - 1996-1944 DO - 10.3390/ma7127615 UR - https://m2.mtmt.hu/api/publication/2823890 ID - 2823890 AB - One weight percent of differently sized Au nanoparticles were deposited on two commercially available TiO2 photocatalysts: Aeroxide P25 and Kronos Vlp7000. The primary objective was to investigate the influence of the noble metal particle size and the deposition method on the photocatalytic activity. The developed synthesis method involves a simple approach for the preparation of finely-tuned Au particles through variation of the concentration of the stabilizing agent. Au was deposited on the TiO2 surface by photo-or chemical reduction, using trisodium citrate as a size-tailoring agent. The Au-TiO2 composites were synthetized by in situ reduction or by mixing the titania suspension with a previously prepared gold sol. The H-2 production activities of the samples were studied in aqueous TiO2 suspensions irradiated with near-UV light in the absence of dissolved O-2, with oxalic acid or methanol as the sacrificial agent. The H-2 evolution rates proved to be strongly dependent on Au particle size: the highest H-2 production rate was achieved when the Au particles measured similar to 6 nm. LA - English DB - MTMT ER - TY - THES AU - Kmetykó, Ákos TI - Hidrogénfejlesztés nemesfémekkel módosított felületű TiO2 fotokatalizátorok alkalmazásával PB - Szegedi Tudományegyetem (SZTE) PY - 2014 SP - 73 DO - 10.14232/phd.2350 UR - https://m2.mtmt.hu/api/publication/2819516 ID - 2819516 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Kmetykó, Ákos AU - Mogyorósi, Károly AU - Gerse, V AU - Kónya, Zoltán AU - Pusztai, Péter AU - Dombi, András AU - Hernádi, Klára TI - Photocatalytic H-2 Production Using Pt-TiO2 in the Presence of Oxalic Acid: Influence of the Noble Metal Size and the Carrier Gas Flow Rate JF - MATERIALS J2 - MATERIALS VL - 7 PY - 2014 IS - 10 SP - 7022 EP - 7038 PG - 17 SN - 1996-1944 DO - 10.3390/ma7107022 UR - https://m2.mtmt.hu/api/publication/2792466 ID - 2792466 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 (lambda(max) = 365 nm) in the presence of oxalic acid (50 mM) as a sacrificial hole scavenger component. The H-2 evolution rates proved to be strongly dependent on the Pt particle size, as well as the irradiation time. A significant change of H-2 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+/H-2 redox potential on the surface of the catalyst. The later potential is influenced by the concentration of the dissolved H-2 gas in the reaction mixture. LA - English DB - MTMT ER - TY - CHAP AU - Kmetykó, Ákos AU - Szániel, Ádám AU - Mogyorósi, Károly AU - Dombi, András AU - Hernádi, Klára ED - Josef, Krysa TI - Visible light driven photocatalytic H2 production using noble metal modified TiO2 T2 - Fourth International Conference on Semiconductor Photochemistry PB - Academy of Sciences of the Czech Republic CY - Prague SN - 9788070808542 PY - 2013 SP - 141 EP - 141 PG - 1 UR - https://m2.mtmt.hu/api/publication/2368526 ID - 2368526 LA - English DB - MTMT ER - TY - CONF AU - Dombi, András AU - Arany, Eszter AU - Illés, Erzsébet AU - Farkas, János AU - Karácsonyi, Éva AU - Kmetykó, Ákos AU - Pap, Zsolt AU - Szabó, Emese AU - Vajda, Krisztina AU - Veréb, Gábor AU - Alapi, Tünde AU - Schrantz, Krisztina AU - Hernádi, Klára AU - Takács, Erzsébet AU - Wojnárovits, László TI - Nagyhatékonyságú oxidációs eljárások biológiai és kémiai szennyezők eltávolítására T2 - I. Környezetkémiai Szimpózium PY - 2012 SP - 20 EP - 20 PG - 1 UR - https://m2.mtmt.hu/api/publication/2967631 ID - 2967631 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Pap, Zsolt AU - Karácsonyi, Éva AU - Dombi, András AU - Danciu, V AU - Mogyorósi, Károly AU - Pop, L C AU - Cosoveanu, V AU - Vulpoi, A AU - Baia, L AU - Kmetykó, Ákos ED - A, Mendez-Vilas TI - Noble metal deposited TiO2/WO3 composite photocatalysts for hydrogen production: the role of the localization of the gold or platinum nanoparticles T2 - The Energy and Materials Research Conference PB - BrownWalker Press CY - Malaga SN - 9781612335582 PY - 2012 SP - 249 EP - 249 PG - 1 UR - https://m2.mtmt.hu/api/publication/2370893 ID - 2370893 LA - English DB - MTMT ER - TY - CONF AU - Mogyorósi, Károly AU - Kmetykó, Ákos AU - Sántáné Gerse, Viktória AU - Hernádi, Klára AU - Dombi, András TI - Hydrogen production with TiO2 photocatalysts modified by Pt nanoparticles in different sizes T2 - The Energy and Materials Research Conference PB - Formatex Research Center C1 - Malaga PY - 2012 SP - 241 EP - 241 PG - 1 UR - https://m2.mtmt.hu/api/publication/2370890 ID - 2370890 LA - English DB - MTMT ER - TY - CHAP AU - Pap, Zsolt AU - Ambrus, Zoltán AU - Veréb, Gábor AU - Kmetykó, Ákos AU - Dombi, András AU - Hernádi, Klára AU - Mogyorósi, Károly ED - Kónya, Zoltán ED - Kukovecz, Ákos TI - Different synthesis approaches improving the photocatalytic performance of titanium dioxide photocatalyst nanoparticles for water purification and hydrogen production T2 - SIWAN5: 5th Szeged International Workshop on Advances in Nanoscience PB - Akadémiai Kiadó CY - Budapest SN - 9789630593052 PY - 2012 SP - 110 EP - 111 PG - 2 UR - https://m2.mtmt.hu/api/publication/2368578 ID - 2368578 LA - English DB - MTMT ER - TY - CHAP AU - Kmetykó, Ákos AU - Mogyorósi, Károly AU - Sántáné Gerse, Viktória AU - Hernádi, Klára AU - Dombi, András ED - Kónya, Zoltán ED - Kukovecz, Ákos TI - Hydrogen production with Au or Pt modified TiO2 photocatalysts as a function of noble metal nanoparticle size T2 - SIWAN5: 5th Szeged International Workshop on Advances in Nanoscience PB - Akadémiai Kiadó CY - Budapest SN - 9789630593052 PY - 2012 SP - 125 EP - 126 PG - 2 UR - https://m2.mtmt.hu/api/publication/2368571 ID - 2368571 LA - English DB - MTMT ER -