title: Directly Probing Charge Separation at Interface of TiO2Phase Junction.
abstract: Phase junction is often recognized as an effective strategy to achieve efficient charge separation in photocatalysis and photochemistry. As a crucial factor to determine the photogenerated charges dynamics, there is an increasingly hot debate about the energy band alignment across the interface of phase junction. Herein, we reported the direct measurement of the surface potential profile over the interface of TiO2phase junction. A built-in electric field up to 1 kV/cm from rutile to anatase nanoparticle was detected by Kelvin Probe Force Microscopy (KPFM). Home-built spatially resolved surface photovoltage spectroscopy (SRSPS) supplies a direct evidence for the vectorial charge transfer of photogenerated electrons from rutile to anatase. Moreover, the tunable anatase nanoparticle sizes in TiO2phase junction leads to high surface photovoltage (SPV) by creating completely depleted space charge region (SCR) and enhancing the charge separation efficiency. The results provide a strong basis for understanding the impact of built-in electric field on the charge transfer across the interface of artificial photocatalysts.
authors.affiliation: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy , Zhongshan Road 457, Dalian 116023, China.|University of Chinese Academy of Science , Beijing, 100049, China.|Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) , Zhongshan Road 457, Dalian 116023, China.
authors.forename: Yuying
authors.initials: Y
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy , Zhongshan Road 457, Dalian 116023, China.|Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) , Zhongshan Road 457, Dalian 116023, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy , Zhongshan Road 457, Dalian 116023, China.|University of Chinese Academy of Science , Beijing, 100049, China.|Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) , Zhongshan Road 457, Dalian 116023, China.
authors.forename: Hongyu
authors.initials: H
authors.lastname: An
authors.affiliation: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy , Zhongshan Road 457, Dalian 116023, China.|University of Chinese Academy of Science , Beijing, 100049, China.
authors.forename: Pengli
authors.initials: P
authors.lastname: Yan
authors.affiliation: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy , Zhongshan Road 457, Dalian 116023, China.
authors.forename: Baokun
authors.initials: B
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy , Zhongshan Road 457, Dalian 116023, China.|University of Chinese Academy of Science , Beijing, 100049, China.|Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) , Zhongshan Road 457, Dalian 116023, China.
authors.forename: Ruotian
authors.initials: R
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy , Zhongshan Road 457, Dalian 116023, China.|Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) , Zhongshan Road 457, Dalian 116023, China.
authors.forename: Fengtao
authors.initials: F
authors.lastname: Fan
authors.affiliation: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy , Zhongshan Road 457, Dalian 116023, China.|Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) , Zhongshan Road 457, Dalian 116023, China.
authors.forename: Can
authors.identifier: http://orcid.org/0000-0002-9301-7850
authors.initials: C
authors.lastname: Li