Pravin Shinde | Korea Electrotechnology Research Institute (KERI) (original) (raw)

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Papers by Pravin Shinde

International Journal of Energy …, Jan 1, 2011

The objective of this study is to demonstrate the significant improvement in the photoelectrochem... more The objective of this study is to demonstrate the significant improvement in the photoelectrochemical (PEC) hydrogen generation by a photoanode owing to the increased surface area of the substrate. In this work, multilayered tungsten oxide (WO 3 ) films have been successfully synthesized onto the large-area sheet (9 Â 9cm 2 ) and mesh (1 Â 20cm 2 ) -type stainless steel (SS) substrates using screen printing and brush painting methods, respectively. All the WO 3 films are porous and nanocrystalline (30-80nm) in nature with a monoclinic crystal structure as revealed from X-ray diffraction and scanning electron microscopy studies. The PEC water splitting study is performed under simulated 1 SUN illumination (AM1.5G) in a typical two-electrode cell configuration with WO 3 photoanode and Pt wire immersed in 0.5M H 2 SO 4 electrolyte. The photocurrent as well as hydrogen generation rate for WO 3 photoanodes coated on the plane SS sheet substrate is relatively low and showed minimal change with increasing film thickness. On the other hand, the photocurrent as well as the hydrogen generation is enhanced by a 3-4 fold degree for the WO 3 photoanodes coated on SS mesh. We attribute such efficient water splitting to the increment in the filling factor of the WO 3 material due to the large effective surface area of the SS mesh as compared to the SS sheet substrate.

Applied Surface …, Jan 1, 2011

TiO 2 thin films with novel nanocoral-like morphology were successfully grown directly onto the g... more TiO 2 thin films with novel nanocoral-like morphology were successfully grown directly onto the glass and conducting fluorine doped tin oxide coated glass substrates via multi-step hydrothermal (MSH) process. Titanium chloroalkoxide [TiCl 2 (OEt) 2 (HOEt) 2 )] precursor was used in an aqueous saturated NaCl in presence of 1 mM HCl catalyst and HNO 3 peptizer at 120 • C. Reaction time varied from 3 to 12 h. The morphological features and physical properties of TiO 2 films were investigated by field emission scanning electron microscopy, high resolution transmission electron microscopy, X-ray diffraction, Fourier transform IR spectroscopy, Fourier transform Raman spectroscopy, room temperature photoluminescence spectroscopy and X-ray photoelectron spectroscopy. The surface morphology revealed the formation of TiO 2 corals having nanosized (30-40 nm) polyps. The photoelectrochemical properties of the TiO 2 nanocoral electrodes were investigated in 0.1 M NaOH electrolyte under UV illumination. The results presented in this study highlight two major findings: (i) ability to tune the photoelectrochemical response and photoconversion efficiency via controlled thickness of TiO 2 nanocorals and (ii) the substantial increase in short circuit photocurrent (J sc ) due to the improved charge transport through TiO 2 nanocorals prepared via MSH process. This approach would be quite useful for the fabrication of nanocoral architecture that finds key applications in photocatalysis, dye-sensitized solar cells and hybrid solar cells.