Electrical properties of FePc organic semiconductor thin films obtained by CSP technique for photovoltaic applications

Tatar, Beyhan; Demiroğlu, D.

doi:10.1016/j.mssp.2014.12.078

Cited by 24 publications

(6 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fe SAC@G catalysts were potentiostatically discharged at 0.88 V in 3 M KOH solutions at 25 °C for different time periods to obtain different current attenuation rates I ca and their corresponding Raman spectra are shown in Figure a. According to previous analysis, , the peaks at 236, 834, 1454, and 1527 cm –1 are assigned to the vibrations of Fe–N, C–N, C–C, and C–N–C bonds, respectively. Since the C–C bond is the strongest bond among these bonds, its peak intensity (noted as P c–c ) almost keeps unchanged for all of the catalysts with different I ca values, suggesting that the C–C bond does not substantially break during the discharge process.…”

Section: Resultsmentioning

confidence: 95%

Investigations on the ORR Catalytic Performance Attenuation of a 1D Fe Single-Atom Catalyst during the Discharge Process

Yan

Liu

et al. 2022

J. Phys. Chem. C

View full text Add to dashboard Cite

The attenuation process of the oxygen reduction reaction (ORR) catalytic performance for Fe SAC@G catalysts under different discharging conditions, including KOH concentrations, solution temperatures, and discharging potentials, was investigated by electrochemical measurements. The ORR catalytic activity attenuation resulting from the change in KOH concentration and temperature becomes apparent in a negative discharging potential range and elevated discharging temperature. In addition, the more negative discharging potential significantly causes the ORR catalytic activity attenuation. Scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy analyses indicate that, with the prolongation of the discharge time, the nanocolumns of the as-prepared catalyst gradually dissolve, while a flowerlike discharge byproduct composed of elements C and N keeps growing on the surface of the catalyst. The weakest Fe−N bonds first break, resulting in the attenuation of the ORR catalytical performance. Then, the weak C−C unit bonds connecting the structural units of the catalysts break, leading to the gradual collapse in the structure of the catalysts. The Fe−N 4 coordination structure gradually transforms into Fe−N 3 , Fe−N 2 , and Fe−N coordination structures. Based on the analyses combined with the density functional theory (DFT) calculations of bond strength, a discharge attenuation mechanism of the structural collapse of the catalyst for the formation of the discharge byproduct with ring structure is proposed.

show abstract

Section: Resultsmentioning

confidence: 95%

Investigations on the ORR Catalytic Performance Attenuation of a 1D Fe Single-Atom Catalyst during the Discharge Process

Yan

Liu

et al. 2022

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

“…Figure 5a displays the Raman spectra of FePc powders and synthesized Fe-N-C-f catalyst. The peaks located at 1449 cm −1 and 1456 cm −1 were all caused by the vibration of C-C bonds in FePc powders and Fe-N-C-f catalyst, respectively [31]. Because the peak height of the C-C bonds essentially did not change, C-C bonds in FePc powders and Fe-N-C-f catalyst were thus stable during the synthetic process.…”

Section: Raman and Xps Analysesmentioning

confidence: 95%

Morphology and Structure Controls of Single-Atom Fe–N–C Catalysts Synthesized Using FePc Powders as the Precursor

et al. 2021

View full text Add to dashboard Cite

Understanding the origin of the high electrocatalytic activity of Fe–N–C electrocatalysts for oxygen reduction reaction is critical but still challenging for developing efficient sustainable nonprecious metal catalysts used in fuel cells. Although there are plenty of papers concerning the morphology on the surface Fe–N–C catalysts, there is very little work discussing how temperature and pressure control the growth of nanoparticles. In our lab, a unique organic vapor deposition technology was developed to investigate the effect of the temperature and pressure on catalysts. The results indicated that synthesized catalysts exhibited three kinds of morphology—nanorods, nanofibers, and nanogranules—corresponding to different synthesis processes. The growth of the crystal is the root cause of the difference in the surface morphology of the catalyst, which can reasonably explain the effect of the temperature and pressure. The oxygen reduction reaction current densities of the different catalysts at potential 0.88 V increased in the following order: FePc (1.04 mA/cm2) < Pt/C catalyst (1.54 mA/cm2) ≈ Fe–N–C-f catalyst (1.64 mA/cm2) < Fe–N–C-g catalyst (2.12 mA/cm2) < Fe–N–C-r catalyst (2.35 mA/cm2). By changing the morphology of the catalyst surface, this study proved that the higher performance of the catalysts can be obtained.

show abstract

“…S1b, under excitation of the laser at 633 nm, that is closer to the resonance with the main Q absorption band of phthalocyanine, typical vibrational bands were observed. The bands between 650 and 726 cm -1 can be associated both with the C-Cl stretch (550-790 cm -1 ) in the Pc periphery [40] and with the Pc ring "breathing" at around 681 -686cm -1 [41][42][43][44].The medium bands at around 780 -787cm -1 are associated to C=N aza stretching [45]. The weak bands at around 866-867 cm -1 are referred with both the coupling of isoindole deformation and with the aza stretching C-H bend [41][42][43][44].…”

Section: 1catalysts Characterizationmentioning

confidence: 99%

Kinetic study of α-pinene allylic oxidation over FePcCl16-NH2-SiO2 catalyst

Becerra

González

Villa

2016

Journal of Molecular Catalysis A: Chemical

View full text Add to dashboard Cite

Electrical properties of FePc organic semiconductor thin films obtained by CSP technique for photovoltaic applications

Cited by 24 publications

References 22 publications

Investigations on the ORR Catalytic Performance Attenuation of a 1D Fe Single-Atom Catalyst during the Discharge Process

Investigations on the ORR Catalytic Performance Attenuation of a 1D Fe Single-Atom Catalyst during the Discharge Process

Morphology and Structure Controls of Single-Atom Fe–N–C Catalysts Synthesized Using FePc Powders as the Precursor

Kinetic study of α-pinene allylic oxidation over FePcCl16-NH2-SiO2 catalyst

Contact Info

Product

Resources

About