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Platinum Nanoparticles Supported on TiO 2 Photonic Crystals as Highly Active Photocatalyst for the Reduction of CO 2 in the Presence of Water
Author(s) -
Jiao Jinqing,
Wei Yuechang,
Chi Kebin,
Zhao Zhen,
Duan Aijun,
Liu Jian,
Jiang Guiyuan,
Wang Yajun,
Wang Xilong,
Han Changcun,
Zheng Peng
Publication year - 2017
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201600572
Subject(s) - photocatalysis , materials science , platinum , photonic crystal , platinum nanoparticles , nanoparticle , visible spectrum , catalysis , colloidal crystal , chemical engineering , irradiation , nanotechnology , photochemistry , colloid , optoelectronics , chemistry , organic chemistry , physics , nuclear physics , engineering
Photonic crystals can delay the propagation of light and increase its path length through a slow‐light effect, which could have immense potential in improving photocatalytic conversion efficiencies. We employed a colloidal crystal template method to synthesize TiO 2 photonic crystals (PC‐TiO 2 ), with platinum nanoparticles (Pt NPs) being deposited on the surface of the PC‐TiO 2 support at different loading amounts by the gas bubbling‐assisted membrane reduction (GBMR) method. A series of Pt/PC‐TiO 2 photocatalysts with well‐defined inverse‐opal structure have uniform Pt NPs (about 2.5 nm) homogeneously dispersed on the pore walls of the support. The slow‐light effect of photonic crystals effectively enhances the absorption efficiency of solar irradiation. Moreover, the Pt deposition significantly extends the spectral response and reduces the recombination rates of photoinduced electron–hole pairs. As a result, the Pt x /PC‐TiO 2 catalysts exhibit excellent photocatalytic activity for the reduction of CO 2 in the presence of H 2 O. In addition, we propose a reaction mechanism for the photoreduction of CO 2 under light irradiation.