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Koyyada, Ganesh,Pilli, Navya Sree,Jung, Jae Hak,Mandari, Kotesh Kumar,Shanigaram, Balaiah,Chandrasekharam, Malapaka Elsevier 2018 International journal of hydrogen energy Vol.43 No.14
<P><B>Abstract</B></P> <P>Five new photocatalysts have been synthesized in order to extend the photo response upto visible range, by adsorbing MC113-MC117 ruthenium complexes on TiO<SUB>2</SUB>-Pt composites. Highlight harvesting properties of these ruthenium complexes instigated us to evaluate for photocatalytic activity. The absorption curves of the synthesized photocatalysts extended up to 750 nm. Morphological studies of photocatalysts have been carried out using SEM and powder X-ray crystallography. Among all photocatalysts, MC113PC showed high photocatalytic activity <I>i.e.</I> 9474 TONs. IPCE and fluorescence quenching studies of the catalysts revealed the light harvesting nature and electron injection efficiency. The photocatalytic activity of MC photocatalysts were systematically screened at different pH and employing different sacrificial electron donors (SED) in order to obtain optimal photocatalytic performance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The effect of structure related properties was studied for five photocatalysts. </LI> <LI> Screened at different pH and SED for optimal photocatalytic performance. </LI> <LI> All the visible range photocatalysts, extended the absorption upto 750 nm. </LI> <LI> First report of photocatalytic H<SUB>2</SUB> production using thiocyanate based Ru complexes. </LI> <LI> Highest TON of hydrogen production was obtained for MC113PC i.e. 9110. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Long Wavelength Absorbing Porphyrin Dyes in Dye-Sensitized Solar Cells
이지현,김현조,( Ganesh Koyyada ),김재홍 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Novel porphyrin sensitizers had been designed and synthesized by the new synthetic method and characterized by various spectroscopic techniques to explore in dye-sensitized solar cells (DSSCs). The long wavelength absorbing porphyrin sensitizers were characterized by the cyclic voltammetry for electrochemical properties. The absorption character of synthesized porphyrin on the photo-electrode was different with that of solution state which made totally different IPCE spectrum in DSSCs. We tried to estimate and understand the difference between absorption property of porphyrin on the photo-electrode and IPCE characteristics in DSSC.
이지현,전지훈,( Ganesh Koyyada ),김재홍 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Two new porphyrin dyes based on donor-pi-acceptor (D-pi-A) approach have been designed, synthesized, characterized by various spectroscopic techniques and explored to the DSSC performance. Where carbazole acts as an acceptor. All compounds were characterized by using 1H NMR, Mass (EIS-Ms), UV-visible, emission spectroscopies, as well as cyclic voltammetry for electrochemical properties. The two porphyrin sensitizers were synthesized in a new cost-effective synthesis route. The presence of aromatic groups on porphyrin pi-plane leads to enhance the soret and Q-band of porphyrin towards the bathochromic shift. The introduction of hydroxylamine group not only enhances the efficiency but also helps in increasing the dye stability.
차하림,신규호,( Ganesh Koyyada ),김재홍 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The energy transfer is essential for an enhanced dye loading, power conversion efficiency (PCE), and broad light harvesting nature of dye-sensitized solar cells (DSSCs). The energy transfer process is composed of organic fluorescent materials (as an energy donor material), and an organic dye (as an energy acceptor on TiO2 semiconductor surfaces) with solid electrolyte. Organic fluorescence materials can absorb the wavelength light that usually cannot be absorbed in photosensitizers, and emit the wavelength light that can be well absorbed in photosensitizers which enhance the light harvesting efficiency in DSSCs. We believe that proper choice of energy donor and acceptor can optimize the light harvesting property and photovoltaic efficiency of DSSC.
차하림,이영서,( Ganesh Koyyada ),이도경,김재홍 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Förster resonance energy transfer is crucial for an increased dye loading, photocurrent generation, and broad spectral absorption of dye-sensitized solar cells. This process consists of organic fluorescent materials, and an organic dye with quasi-solid electrolyte. The FM moiety has multiple roles of (i) acting as an extra-electron donor portion, providing more electron density on the organic dye; (ii); controlling molecular aggregation on the TiO2 surface (iii) retarding the back-electron transfer from TiO2 to the redox mediator by forming a compact insulating dye layer; and (iv) acting as an antenna, collecting photons and, through long-range energy transfer, redirecting the captured energy to the dye sensitizer. In this study, DSSCs containing different concentrations (0, 0.5, 1, 1.5 and 2 wt.%) of a FM as the energy donor are investigated using FRET. The power conversion efficiency of DSSCs containing FMs in a quasi-solid electrolyte increased by 40% over a pristine cell.
박목련,장유정,( Ho Phuong ),( Ganesh Koyyada ),안광순,김재홍 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Dye sensitized solar cells are currently attracting widespread academic and commercial interest for the conversion of sunlight into electricity because of their low cost and high efficiency. Among them, the performance of DSSCs based on organic dyes have been remarkably improved. Organic dyes have many advantages as photosensitizers, such as large molar extinction coefficient, control of absorption wavelength, facile design and synthesis, and lower cost than those of ruthenium complexes. Therefore, it is expected that organic dyes could compete with ruthenium complexes in the near future. So, We report that a combined experimental and computational study of several ruthenium(II) sensitizers and organic sensitizers.
장유정,이지윤,박목련,( Ganesh Koyyada ),이도경,김재홍 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Forster resonance energy transfer (FRET) is critical for wide spectral absorption, an increased dye loading, and photocurrent generation of dye-sensitized solar cells (DSSCs). This process consists of organic fluorescent materials (as an energy donor), and an organic dye (as an energy acceptor on TiO2 surfaces) with quasi-solid electrolyte. The judicious choice of the energy donor and acceptor facilitates a strong spectral overlap between the emission and absorption regions of the fluorescent materials and dye. This FRET process enhances the light-harvesting characteristics of quasi-solid state DSSCs. In this study, DSSCs containing different concentrations (0, 1, and 1.5 wt.%) of a fluorescent material (FM) as the energy donor are investigated using FRET. The power conversion efficiency of DSSCs containing FMs in a quasi-solid electrolyte increased by 33% over a pristine cell.