期刊
NANO RESEARCH
卷 10, 期 1, 页码 295-304出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-016-1292-6
关键词
MgTiO3/MgTi2O5/TiO2; heterogeneous belt-junctions; photocatalytic hydrogen production
类别
资金
- National Natural Science Foundation of China [21471050, 21501052, 21473051]
- China Postdoctoral Science Foundation [2015M570304]
- Postdoctoral Science Foundation of Heilongjiang Province [LBH-Q11009, LBH-TZ06019]
- Heilongjiang Province Natural Science Foundation [ZD201301, QC2015010]
- Harbin Technological Innovation Talent of Special Funds [RC2013QN017028]
An effective photocatalytic hydrogen production catalyst comprising MgTiO3/MgTi2O5/TiO2 heterogeneous belt-junctions was prepared using magnesium ions by a thermally driven doping method. The tri-phase heterogeneous junction was confirmed by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and high-resolution TEM (HRTEM). The as-prepared MgTiO3/MgTi2O5/TiO2 heterojunctions exhibited a very high photocatalytic hydrogen production activity (356.1 mol center dot g(0.1gcat)center dot h(-1)) and an apparent quantum efficiency (50.69% at 365 nm) that is about twice of that of bare TiO2 nanobelts (189.4 mol center dot g(0.1gcat)center dot h(-1)). Linear sweep voltage and transient photocurrent characterization as well as analysis of the electrochemical impedance spectra and Mott-Schottky plots revealed that the high photocatalytic performance is caused by the one-dimensional structure, which imparts excellent charge transportation characteristic, and the MgTiO3/MgTi2O5/TiO2 tri-phase heterojunction, which effectively drives the charge separation through the inherent electric field. This titanate-based tri-phase heterogeneous junction photocatalyst further enriches the catalyst system for photocatalytic hydrogen production.
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