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Study on the Preparation and Characterizations of an Improved Porous Ti/TiO 2 /CdS‐CNT/C 3 N 4 Photoelectrode and Photoelectric Catalytic Degradation of Methylene Blue
Author(s) -
Shen Jia,
Chen Donghui,
Zhao Wei,
Zhang Wen wen,
Zhou Huipin
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201703066
Subject(s) - materials science , x ray photoelectron spectroscopy , photocurrent , linear sweep voltammetry , dielectric spectroscopy , cyclic voltammetry , scanning electron microscope , chemical engineering , electrode , electrochemistry , analytical chemistry (journal) , chemistry , composite material , optoelectronics , chromatography , engineering
The porous Ti/TiO 2 /CdS‐CNT/C 3 N 4 photoelectrode were successfully fabricated via anodic oxidation method, chemical electrodeposition and dip‐coating method, respectively. The morphology, crystal structure and elements of the photoelectrodes were characterized by scanning electron microscopy (SEM), X‐ray diffraction (XRD), energy‐dispersive spectroscopy (EDS) and X‐ray photoelectron spectroscopy (XPS) respectively. The cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), linear sweep voltammograms curves (LSV), mott‐schottky (MS) and chronoamperometric curves were applied to research the oxidation‐reduction quality, resistance, carriers concentration and photocurrent stability respectively. Addtionally, the service lifetime of electrodes were measured in accelerated life test. The photo‐ electrocatalytic (PEC) performance of the photoelectrodes were evaluated in the degradation experiment of methylene blue. Compared with the Ti/TiO 2 and Ti/TiO 2 /CdS‐CNT electrode, the Ti/TiO 2 /CdS‐CNT/C 3 N 4 electrode possesses smaller grain size on the surface, more uniform crystal morphology, lower resistance, bigger photocurrent density, oxygen evolution potential and photogenerated carriers concentration and performed higher PEC activity. Moreover, the generation of much holes, H 2 O 2 , and ⋅OH can promote the PEC degradation of organic pollutants. Particularly, C 3 N 4 can further increase ⋅OH generation capacity.