Viswanathan S. Saji

Publications (53) View all

• Source

  Available from: Viswanathan S. Saji

  Article: Reversible Redox Transition and Pseudocapacitance of Molybdenum/Surface Molybdenum Oxides

  Viswanathan S. Saji, Chi-Woo Lee
  Journal of The Electrochemical Society 01/2013; 160:H54-H61. · 2.59 Impact Factor
• Source

  Available from: Viswanathan S. Saji

  Article: Molybdenum, molybdenum oxides, and their electrochemistry.

  Viswanathan S Saji, Chi-Woo Lee
  [show abstract] [hide abstract]
  ABSTRACT: The electrochemical behaviors of molybdenum and its oxides, both in bulk and thin film dimensions, are critical because of their widespread applications in steels, electrocatalysts, electrochromic materials, batteries, sensors, and solar cells. An important area of current interest is electrodeposited CIGS-based solar cells where a molybdenum/glass electrode forms the back contact. Surprisingly, the basic electrochemistry of molybdenum and its oxides has not been reviewed with due attention. In this Review, we assess the scattered information. The potential and pH dependent active, passive, and transpassive behaviors of molybdenum in aqueous media are explained. The major surface oxide species observed, reversible redox transitions of the surface oxides, pseudocapacitance and catalytic reduction are discussed along with carefully conducted experimental results on a typical molybdenum glass back contact employed in CIGS-based solar cells. The applications of molybdenum oxides and the electrodeposition of molybdenum are briefly reviewed.
  ChemSusChem 06/2012; 5(7):1146-61. · 6.83 Impact Factor
• Source

  Available from: Viswanathan S. Saji

  Article: One-dimensional (1D) nanostructured and nanocomposited LiFePO4: its perspective advantages for cathode materials of lithium ion batteries.

  Viswanathan S Saji, Young-Soo Kim, Tae-Hee Kim, Jaephil Cho, Hyun-Kon Song
  [show abstract] [hide abstract]
  ABSTRACT: Nanostructured materials have attracted recent research interest as battery materials due to their expected enhancement of properties. The characteristic nanoscale dimension and its structuring guarantees improved charge and mass transfer during charge/discharge processes. Among the potential cathode materials investigated as a substitute to LiCoO(2), one of the most promising materials is LiFePO(4) with olivine structure (LFP). In this perspective article, the current research and development in the synthesis and electrochemical studies of nanostructured LFP are reviewed with a special emphasis on one-dimensional (1D) nanostructures and nanocompositing with 1D conductive materials. In addition to various examples of 1D LFP with detailed synthetic methods, why 1D nanostructures could be meaningful is discussed in terms of a geometric point of view and the anisotropic lithiation/de-lithiation mechanism of LFP.
  Physical Chemistry Chemical Physics 11/2011; 13(43):19226-37. · 3.57 Impact Factor
• Source

  Available from: Viswanathan S. Saji

  Article: Organic-skinned inorganic nanoparticles: surface-confined polymerization of 6-(3-thienyl)hexanoic acid bound to nanocrystalline TiO2.

  Viswanathan S Saji, Yimhyun Jo, Hoi Ri Moon, Yongseok Jun, Hyun-Kon Song
  [show abstract] [hide abstract]
  ABSTRACT: ABSTRACT: There are many practical difficulties in direct adsorption of polymers onto nanocrystalline inorganic oxide surface such as Al2O3 and TiO2 mainly due to the insolubility of polymers in solvents or polymer agglomeration during adsorption process. As an alternative approach to the direct polymer adsorption, we propose surface-bound polymerization of pre-adsorbed monomers. 6-(3-Thienyl)hexanoic acid (THA) was used as a monomer for poly[3-(5-carboxypentyl)thiophene-2,5-diyl] (PTHA). PTHA-coated nanocrystalline TiO2/FTO glass electrodes were prepared by immersing THA-adsorbed electrodes in FeCl3 oxidant solution. Characterization by ultraviolet/visible/infrared spectroscopy and thermal analysis showed that the monolayer of regiorandom-structured PTHA was successfully formed from intermolecular bonding between neighbored THA surface-bound to TiO2. The anchoring functional groups (-COOH) of the surface-crawling PTHA were completely utilized for strong bonding to the surface of TiO2.
  Nanoscale Research Letters 09/2011; 6(1):521. · 2.73 Impact Factor
• Source

  Available from: Viswanathan S. Saji

  Article: Contemporary Developments in Corrosion Inhibitors – Review of Patents

  V.S. Saji
  [show abstract] [hide abstract]
  ABSTRACT: Selection of an appropriate corrosion inhibitor, inhibitor combination or package is an exceptionally cost effective and materials saving measure in various industries. The article reviews recent (2008-2010) patents reported on corrosion inhibitors. Up-to-date developments in the inhibition technology are presented in accordance with the areas of application of inhibitors - industrial cooling water systems, oil and gas fields, coatings, acid pickling, lubricants, vapor phase inhibition, concrete corrosion etc. Nanotechnological advancements in inhibitor technology (in coatings) and novel products employing vapor phase corrosion inhibitors were discussed.
  Recent patents on Corrosion Science. 01/2011; 1:63-71.