Conference Proceeding

Nanomaterials for Photocatalytic, Microwave dielectric and Fuel cell Applications

Dr. Masood Ahmad,
Higher College of Technology-Muscat, Oman

Dr. Masood has completed his Ph.D in 2009 from University of Kashmir and postdoctoral from Indian Institute of Technology-Delhi (IIT-Delhi), India for a period of three years. He is working on ‘Synthesis and Properties of Nanomaterials/Materials for Photocatalytic, microwave dielectric, water purification, fuel cell and field emission propeerties. He worked as assistant professor in various places like University of Delhi, University of Kashmir, National Institute of Technology-Srinagar, India. Presently he is working as a faculty in the department of Chemistry, Higher College of Technology-Muscat, Sultanate of Oman

Homogeneous nano crystalline NiO-Ce0.9Ln0.1O2-d (Ln = La, Sm and Gd and Pr) composite anode and nano crystalline Ce0.9Gd0.1O2-d electrolyte material has been successfully synthesized by citrate precursor method. LSCF has been synthesized by conventional solid state method and used as cathode material in our studies. The average crystallite size of the anode materials has been found to be in the range of 5-15 nm by transmission electron microscopy. Three cells have been fabricated successfully. The electrochemical performance of the single cells with configuration NiO-Ce0.9Ln0.1O2-d (Ln = La, Sm and Gd) (anode) // Ce0.9Gd0.1O2-d (electrolyte) // La0.8Sr0.2Co0.2Fe0.8O3 (LSCF) (cathode) have been evaluated using humidified hydrogen as the fuel and air as the oxidant. It has been observed that the single cell containing NiO-Ce0.9Gd0.1O2-d nano composite anode shows better performance with maximum power density of 302 mW cm-2 and open circuit voltage of 1.012 V at 500 °C compared to other two cells. The performances of all the cells containing nano composite powders are suitable anode materials for low temperature SOFCs. In addition, Increasing demand for new and advanced nanomaterials/materials has motivated a significant research in wireless communication technology, photocatalysis and solid oxide fuel cell applications. The present investigation discusses the synthesis, photocatlytic and dielectric properties of series of complex oxides of the formula La2BaTi2M1-xCuxO9, (where M =Mg, Zn and Cd). All the compositions crystallize in the disordered cubic perovskite structure. Suitable substitution at both A and B sites lead to enhancement in the dielectric properties at high frequencies. The relative permittivity and loss tangent have been measured at X-band (8.2-12.4 GHz) and Ku-band (12.4-18 GHz) frequencies. The oxides show a dielectric constant of 20-30 while the dielectric loss is quite low in the order of 10-3-10-4 (at 500 kHz) and 10-2 at X and Ku-band. Moreover, the photo catalytic properties of activated carbon from natural sources and activated carbon-TiO2 composites has been studied in detail using Rhodamine B, methylene blue and methylene orange as a target pollutant. Our results show better percentage degradation of such pollutants from waste water using low cost activated carbon and AC- TiO2 composites.

Published: 27 April 2017