Soft-template-carbonization route to highly textured mesoporous carbon-TiO₂ inverse opals for efficient photocatalytic and photoelectrochemical applications.
Hierarchically organized mesoporous carbon-TiO2 inverse opal nanostructures were synthesized by complementary colloid and block copolymer (BCP) self-assembly, where the triblock copolymer P123 acts simultaneously as the template and the carbon source. Highly ordered mesoporous inverse opal nanostructures with a nano-textured surface morphology and multiple-length scale nanopores provide increased light-activated surface area and scattering effects, leading to enhanced photoabsorption efficiency and the transport of matter. UV-vis absorption, X-ray photoelectron spectroscopy and Mott-Schottky measurement studies show that incorporation of carbon moieties into TiO2via direct conversion of BCPs creates a new energy level above the valence band of TiO2, resulting in an effective decrease in the band gap. A significantly enhanced visible light photocatalytic activity was demonstrated for the mesoporous carbon-TiO2 inverse opals in terms of the degradation of p-nitrophenol (~79%) and photoelectrochemical water splitting (~0.087%).
Department of Chemistry and Nano Science, Global Top 5 Research Program, Division of Molecular and Life Sciences, College of Natural Sciences, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul 120-750, Korea. dhkim@ewha.ac.kr.
Li Na
LN
Quan
Yoon Hee
YH
Jang
Kelsey A
KA
Stoerzinger
Kevin J
KJ
May
Yu Jin
YJ
Jang
Saji Thomas
ST
Kochuveedu
Yang
Y
Shao-Horn
Dong Ha
DH
Kim