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Controllable Interface‐Induced Co‐Assembly toward Highly Ordered Mesoporous Pt@TiO 2 /g‐C 3 N 4 Heterojunctions with Enhanced Photocatalytic Performance
Author(s) -
Zou Yidong,
Yang Beibei,
Liu Yang,
Ren Yuan,
Ma Junhao,
Zhou Xinran,
Cheng Xiaowei,
Deng Yonghui
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201806214
Subject(s) - materials science , heterojunction , photocatalysis , photocurrent , mesoporous material , rhodamine b , visible spectrum , photodegradation , chemical engineering , charge carrier , nanotechnology , nanoparticle , band gap , catalysis , optoelectronics , organic chemistry , chemistry , engineering
Titania‐based materials have aroused great attention in energy conversion and photocatalytic degradation, but they suffer from the drawbacks of fast electron–hole recombination and narrow light‐adsorption range. Here, a series of heterojunction mesoporous TiO 2 /g‐C 3 N 4 (mTiO 2 /g‐C 3 N 4 ) composites with improved light‐adsorption capacity and efficient light‐capturing property are designed through a novel solid–liquid interface induced co‐assembly strategy and controlling the interface property of g‐C 3 N 4 . Through introducing Pt precursor during the synthesis, ultrasmall Pt nanoparticles are in situ generated in the mTiO 2 /g‐C 3 N 4 composites, forming mesoporous Pt@TiO 2 /g‐C 3 N 4 (mPt @ TiO 2 /g‐C 3 N 4 ‐4.0) with abundant surface active sites, and huge heterojunction interfaces. The obtained mPt @ TiO 2 /g‐C 3 N 4 ‐4.0 photocatalysts have narrow band gap (≈2.96 eV) and superior performance in promoting separation of photogenerated charge carriers. They show ultrahigh photocurrent density (≈8.3 µA cm −2 ) that is five times higher than that of mTiO 2 /g‐C 3 N 4 ‐4.0 (≈1.6 µA cm −2 ) due to the effective charge separation between the semiconductors and Pt nanoparticles, as well as the synergistic effect at heterojunction interfaces. In addition, mPt @ TiO 2 /g‐C 3 N 4 photocatalysts show excellent performance in photodegradation of rhodamine B with fast decomposition rate within 8 min. These results foresee the wide‐range applications of the composite photocatalysts potential candidates for solar‐to‐fuel conversion and environmental remediation.