The electrochemical behavior of brass in natural seawater in the absence and presence of oxadiazole derivatives, namely 2,5-bis-(4-aminophenyl)-1,3,4-oxadiazole (BAPOD), 2,5-bis-(4-bromophenyl)-1,3,4- oxadiazole (BBPOD), 2,5-diphenyl-1,3,4-oxadiazole (DPOD), and 2,5-bis-(4-nitrophenyl)-1,3,4-oxadiazole (BNPOD) has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The inhibition efficiency of the inhibitors was also evaluated at different temperatures. The inhibition efficiency was found to increase with increase in concentration of the inhibitors but decrease with rise in temperature for all the inhibitors except BNPOD. Inductively coupled plasma atomic emission spectroscopic (ICP-AES) analysis confirmed that dezincification was minimized to a greater extent in the presence of the inhibitors. Scanning electron microscopy (SEM), energy dispersive x-ray analysis (EDX) and Fourier transform infrared spectroscopy (FT-IR) observations of the brass surface confirmed the existence of an adsorbed film.

In the present research work spray pyrolysis technique (SPT) is employed to synthesize GDC (10%Gd doped ceria) thin films on anode-grade-ceramic substrate (porous NiO-GDC). The film/substrate structure was characterized for their micro-structural and electrical properties along with their interfacial-quality. By optimization of preparative parameters of SPT and modification of surface of anode grade ceramic substrate, we were able to prepare the GDC films having thickness of the order of 13µm on NiO-GDC substrate. Further to improve the interfacial quality and densification of film, annealing of structure at 1000°C/8h were carried out. GDC films were fully dense (>96%), forming a gas-tight interface with substrate. Impedance measurements revealed that grain interior conductivity for GDC/NiO-GDC half-cell was of the order of 0.1S/cm at 500°C which is the desired conductivity for successful operation of SOFC. The activation energy for grain-interior and grain-boundary conduction estimated for GDC/NiO-GDC was 1.07eV and 0.93eV, respectively