Naik, Brundabana Moon, Song Yi Kim, Sang Hoon Park, Jeong Young 2024-01-20T05:33:53Z 2024-01-20T05:33:53Z 2021-09-05 2015-11-01 0169-4332 https://pubs.kist.re.kr/handle/201004/124775 We report the photocatalytic activity of hydrogen generation on Pt nanoparticles deposited on hierarchically porous N-doped TiO2 nanostructures (Pt-NHPT). The photocatalysts are composed of Pt nanoparticles well dispersed throughout hierarchical macroporous TiO2 fibrous channels. The interstitial N doping extends light absorption toward the visible region. We found that the porosity of N-doped TiO2 nanostructures can be tuned using different annealing temperatures. While Pt-NHPT catalysts calcined at 300 degrees C (Pt-NHPT-300) have both macro- and mesoporosity, Pt-NHPT catalysts calcined at 800 degrees C (Pt-NHPT-800) exhibit only macroporosity. We found that Pt-NHPT-300 shows a two-fold higher H-2 evolution activity than that of Pt-NHPT-800, and 30% higher activity than undoped hierarchical catalysts (Pt-HPT-300). The enhanced photoactivity is attributed to the synergistic effects of N doping, hierarchical porosity, and charge transfer between the TiO2 nanostructures and the Pt co-catalyst. (C) 2015 Elsevier B.V. All rights reserved. English ELSEVIER ELECTRONIC-STRUCTURE WATER NANOPARTICLES PT/TIO2 PT/GAN Enhanced photocatalytic generation of hydrogen by Pt-deposited nitrogen-doped TiO2 hierarchical nanostructures Article 10.1016/j.apsusc.2015.05.102 1 APPLIED SURFACE SCIENCE, v.354, pp.347 - 352 APPLIED SURFACE SCIENCE 354 347 352 scie scopus 000363673500016 2-s2.0-84944275030 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article; Proceedings Paper ELECTRONIC-STRUCTURE WATER NANOPARTICLES PT/TIO2 PT/GAN H-2 generation Photocatalysis Hot electron Hierarchical Macro-meso-micro porosity