Polysiloxane

subhisaleh's picture

Enhancement of Cdse Film Electrode PEC Characteristics by Metalloporphyrin/Polysiloxane Matrices

Journal Title, Volume, Page: 
Electrochimica Acta, 136, 138–145 Year of Publication: 2014
Year of Publication: 
2014
Authors: 
Huda Sabri
Department of Physics, Faculty of Sciences, An-Najah National University, Nablus, Palestine
Subhi Saleh
Department of Physics, Faculty of Sciences, An-Najah National University, Nablus, Palestine
Current Affiliation: 
Department of Physics, Faculty of Sciences, An-Najah National University, Nablus, Palestine
Ahed Zyoud
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Nour N. Abdel-Rahman
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Iyad Saadeddin
Guy Campet
DaeHoon Park
DaeHoon Park
Preferred Abstract (Original): 

A facile and low-cost strategy to improve stability and conversion efficiency of CdSe film electrodes prepared by chemical bath deposition (CBD) onto FTO/glass substrates, is described. The naked CdSe film electrodes, with band gap value 1.8 eV, photo-corroded under the photoelectrochemical (PEC) working conditions and exhibited no photocurrent. The CdSe film peeled out in short times. Attempts made to enhance stability and efficiency of naked CdSe electrodes, by chemical etching or pre-scratching the FTO surface with fine sand-paper, failed to improve film PEC characteristics. Annealing the glass/FTO/CdSe film also failed to improve its PEC stability or efficiency. When coated with the electro-active species Tetra(-4-pyridyl)porphyrinatomanganeseIII/II sulfate embedded inside polysiloxane films (MnPyP/Polysil) the CdSe films did not peel out under the PEC conditions. The coated electrode (glass/FTO/CdSe/MnPyP/Polysil) clearly exhibited photocurrents. Pre-annealing the naked CdSe film at 350 °C, followed by coating with MnPyP/Polysil further enhanced the electrode PEC characteristics. Additional heating of the prepared glass/FTO/CdSe/MnPyP/Polysil electrode at 120 °C also enhanced its PEC characteristics. The mode of action of the MnPyP/Polysil coating has been attributed to its ability to behave as a charge transfer catalyst at the solid/liquid interface. The new technique described here could also be potentially valuable for other types of thin film electrode materials.

iyad's picture

Enhancement of Cdse Film Electrode PEC Characteristics by Metalloporphyrin/Polysiloxane Matrices

Journal Title, Volume, Page: 
Electrochimica Acta, 136, 138–145 Year of Publication: 2014
Year of Publication: 
2014
Authors: 
Huda Sabri
Department of Physics, Faculty of Sciences, An-Najah National University, Nablus, Palestine
Subhi Saleh
Department of Physics, Faculty of Sciences, An-Najah National University, Nablus, Palestine
Ahed Zyoud
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Nour N. Abdel-Rahman
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Iyad Saadeddin
Department of Physics, Faculty of Sciences, An-Najah National University, Nablus, Palestine
Current Affiliation: 
Department of Physics, Faculty of Sciences, An-Najah National University, Nablus, Palestine
Guy Campet
Institut de Chimie de la Matie‘re Condensée de Bordeaux (ICMCB), 87 Avenue du Dr. A Schweitzer, 33608 Pessac, France
DaeHoon Park
Dansuk Industrial Co., LTD. #1239-5, Jeongwang-Dong, Shiheung-Si, Kyonggi-Do, 429-913, South Korea
Mariam Faroun
Al-Quds University, Abu Dies, Palestine
Hikmat S. Hilal
Dansuk Industrial Co., LTD. #1239-5, Jeongwang-Dong, Shiheung-Si, Kyonggi-Do, 429-913, South Korea
Current Affiliation: 
Department of Chemistry, An-Najah National University, Nablus, West Bank, Palestine
Preferred Abstract (Original): 

A facile and low-cost strategy to improve stability and conversion efficiency of CdSe film electrodes prepared by chemical bath deposition (CBD) onto FTO/glass substrates, is described. The naked CdSe film electrodes, with band gap value 1.8 eV, photo-corroded under the photoelectrochemical (PEC) working conditions and exhibited no photocurrent. The CdSe film peeled out in short times. Attempts made to enhance stability and efficiency of naked CdSe electrodes, by chemical etching or pre-scratching the FTO surface with fine sand-paper, failed to improve film PEC characteristics. Annealing the glass/FTO/CdSe film also failed to improve its PEC stability or efficiency. When coated with the electro-active species Tetra(-4-pyridyl)porphyrinatomanganeseIII/II sulfate embedded inside polysiloxane films (MnPyP/Polysil) the CdSe films did not peel out under the PEC conditions. The coated electrode (glass/FTO/CdSe/MnPyP/Polysil) clearly exhibited photocurrents. Pre-annealing the naked CdSe film at 350 °C, followed by coating with MnPyP/Polysil further enhanced the electrode PEC characteristics. Additional heating of the prepared glass/FTO/CdSe/MnPyP/Polysil electrode at 120 °C also enhanced its PEC characteristics. The mode of action of the MnPyP/Polysil coating has been attributed to its ability to behave as a charge transfer catalyst at the solid/liquid interface. The new technique described here could also be potentially valuable for other types of thin film electrode materials.

salshakshir@najah.edu's picture

n-GaAs Band-Edge Repositioning by Modification with Metalloporphyrin/Polysiloxane Matrices

Journal Title, Volume, Page: 
Active and Passive Electronic Components Volume 26 (2003), Issue 1, Pages 11-21
Year of Publication: 
2003
Authors: 
Samar Shakhshir
Department of Chemistry, An-Najah National University, Nablus, Palestine
Current Affiliation: 
Department of Chemistry, An-Najah National University, Nablus, Palestine
Hikmat S. Hilal
Department of Chemistry, An-Najah National University, Nablus, Palestine
Moayad Masoud
Department of Chemistry, An-Najah National University, Nablus, Palestine
Najeh Jisraw
Department of Chemistry, An-Najah National University, Nablus, Palestine
Preferred Abstract (Original): 

Tetra(-4-pyridyl)porphyrinatomanganese(III)sulfate, MnP, (in the forms of MnIII and MnII mixture), was embedded into a polysiloxane polymer matrix and attached to the surfaces of n-GaAs wafers. The n-GaAs=polymer=MnP system was annealed under nitrogen and used for photoelectrochemical study in water=LiClO4=Fe(CN)3 6 = Fe(CN)4 6 system. The results indicated a positive shift in the value of the flat-band potential of the semiconductor due to MnP. This was manifested by shifting the values of the dark-current onset potential and the photo-current open-circuit potential towards more positive values. These findings are potentially valuable in future applications of solar energy in hydrogen and oxygen production from water.

Hikmat S. Hilal's picture

n-GaAs Band-Edge Repositioning by Modification with Metalloporphyrin/Polysiloxane Matrices

Journal Title, Volume, Page: 
Active and Passive Electronic Components Volume 26 (2003), Issue 1, Pages 11-21
Year of Publication: 
2003
Authors: 
Hikmat S. Hilal
Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestinian Authority
Current Affiliation: 
Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine
Moayyad Masoud
Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestinian Authority
Samar Shakhshir
Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestinian Authority
Najeh Jisraw
Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestinian Authority
Preferred Abstract (Original): 

Tetra(-4-pyridyl)porphyrinatomanganese(III)sulfate, MnP, (in the forms of MnIII and MnII mixture), was embedded into a polysiloxane polymer matrix and attached to the surfaces of n-GaAs wafers. The n-GaAs=polymer=MnP system was annealed under nitrogen and used for photoelectrochemical study in water=LiClO4=Fe(CN)3 6 = Fe(CN)4 6 system. The results indicated a positive shift in the value of the flat-band potential of the semiconductor due to MnP. This was manifested by shifting the values of the dark-current onset potential and the photo-current open-circuit potential towards more positive values. These findings are potentially valuable in future applications of solar energy in hydrogen and oxygen production from water.

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