A well-aligned ZnFe2O4/TiO2 composite nanotube array (ZnFe2O4/TiO2-NTs) electrode with visible-light activity was successfully prepared using a two-step electrochemical process of anodization and a novel cathodic electrodeposition method followed by annealing. The ZnFe2O4 nanoparticles were highly dispersed inside the TiO2-NTs but minimized at the tube entrances. The structure and optical properties of the TiO2 nanotubes and the derived composites have been well characterized. The composites displayed a strong photo response in the visible region and low recombination rate of the electron-hole pairs. In addition, the synthesized ZnFe2O4/TiO2 NTs electrode showed much higher photocurrent density in the visible region than pure TiO2 NTs electrode. The dramatically enhanced electrochemically assisted photocatalytic activity of the composite electrode was evaluated in the decomposition of 4-chlorophenol and dichloroacetate under visible light irradiation (420 nm < lambda < 600 nm). The improved photoelectrocatalytic (PEC) activity is derived from the synergetic effect between ZnFe2O4 and TiO2, which promoted the migration efficiency of photogenerated carriers at the interface of the composite and enhanced the efficiency of photon harvesting in the visible region. The degradation of 4-chlorophenol was monitored by measuring Cl- concentrations and analyzing reaction intermediates by high-performance liquid chromatography-mass spectroscopy (HPLC-MS).
机构:
Natl Res Ctr Dokki, Dept Phys Chem, Cairo 12622, EgyptPenn State Univ, Mat Res Inst, University Pk, PA 16802 USA
Allam, Nageh K.
;
Shankar, Karthik
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Penn State Univ, Mat Res Inst, University Pk, PA 16802 USAPenn State Univ, Mat Res Inst, University Pk, PA 16802 USA
Shankar, Karthik
;
Grimes, Craig A.
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Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA
Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USAPenn State Univ, Mat Res Inst, University Pk, PA 16802 USA
机构:
Tsing Hua Univ, Inst Nuclure & New Energy Technol, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R ChinaTsing Hua Univ, Inst Nuclure & New Energy Technol, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
Cheng, Ping
;
Deng, Changsheng
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机构:Tsing Hua Univ, Inst Nuclure & New Energy Technol, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
Deng, Changsheng
;
Gu, Mingyuan
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机构:Tsing Hua Univ, Inst Nuclure & New Energy Technol, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
Gu, Mingyuan
;
Shangguan, Wenfeng
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机构:Tsing Hua Univ, Inst Nuclure & New Energy Technol, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
机构:
Natl Res Ctr Dokki, Dept Phys Chem, Cairo 12622, EgyptPenn State Univ, Mat Res Inst, University Pk, PA 16802 USA
Allam, Nageh K.
;
Shankar, Karthik
论文数: 0引用数: 0
h-index: 0
机构:
Penn State Univ, Mat Res Inst, University Pk, PA 16802 USAPenn State Univ, Mat Res Inst, University Pk, PA 16802 USA
Shankar, Karthik
;
Grimes, Craig A.
论文数: 0引用数: 0
h-index: 0
机构:
Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA
Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USAPenn State Univ, Mat Res Inst, University Pk, PA 16802 USA
机构:
Tsing Hua Univ, Inst Nuclure & New Energy Technol, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R ChinaTsing Hua Univ, Inst Nuclure & New Energy Technol, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
Cheng, Ping
;
Deng, Changsheng
论文数: 0引用数: 0
h-index: 0
机构:Tsing Hua Univ, Inst Nuclure & New Energy Technol, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
Deng, Changsheng
;
Gu, Mingyuan
论文数: 0引用数: 0
h-index: 0
机构:Tsing Hua Univ, Inst Nuclure & New Energy Technol, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
Gu, Mingyuan
;
Shangguan, Wenfeng
论文数: 0引用数: 0
h-index: 0
机构:Tsing Hua Univ, Inst Nuclure & New Energy Technol, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China