The intermediate temperature solid oxide fuel cell (IT-SOFC) is noted for producing clean electricity since it emits very little pollution. The efficiency of IT-SOFCs is highly dependent on cathode performance. Because of its numerous promising features, rare-earth oxides with the K2NiF4 - structure have gotten a lot of interest as cathodes. The goal of this research is to use the combustion approach to make rare earth (electron) and alkaline earth metal (hole) doped cathode materials. Investigate the impact of impurity addition on the cathode's structural, electrical, and electrochemical performance. The influence of oxygen partial pressure on the electrical and electrochemical characteristics of a doped cathode is estimated after optimising dopant concentration on the basis of optimum conductivity and minimal (area specific resistance) ASR. The single phase rare earth oxide Nd2-xSrxFeO4+ δ (x = 0.1 - 0.4) is synthesised experimentally via combustion synthesis. The aggregation of submicron sized crystallites led in the creation of a porous electrode layer, as shown in SEM pictures. The dc conductivity was highest at x = 0.2, which corresponded to the lowest activation energy. The increased porosity resulting from agglomerated submicron crystallites accounts for the decreased dc conductivity compared to literature studies. The defect chemistry of Nd2-xSrxFeO4+ δ explains the Sr-dependent conductivity. The lowest ASR (= 1.92 0.015 Ohm- cm2) is found in the Nd1.8Sr0.2FeO4+ δ cathode, as determined by complicated impedance testing. Charge transfer at the electrode-electrolyte interface is the rate limiting phase, according to ASR analysis in a decreased partial pressure environment.
Author(s) Details:
J. D. Punde,
Department of Physics, S S Girls’ College, Gondia-441 601, India.
V. N. Chaudhari,
M. B. Patel College of Arts Commerce and Science, Sakoli, India.
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