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The system of compositions MySmx-yCe 1- xO 2- δ(M = Al, Ca, Mg &amp; Sr,  x  = 0.20;  y  = 0.025) are investigated in the present study as electrolytes for IT-SOFCs. These samples are prepared by a low-temperature sol-gel process modified by sucrose-pectin to obtain a nanocrystalline powder. The synthesized nanocrystalline powder calcined at 600°C. The average crystallite size is in the range of 11–16 nm. The co-dopants Al, Ca, Mg &amp; Sr promote densification of the SDC 20 at relatively lower sintering temperatures (&lt;1300°C). These samples are characterized by XRD, Williamson-Hall plots, UV-Visible, Raman, FESEM, and impedance spectroscopy. The electrical conductivity is measured in the temperature range of 300–700°C. The sample with composition Sr 0.025 Sm 0.175 Ce 0.80 O 2- δ(SrSDC) exhibits higher electrical conductivity of 0.03342 S/cm at 700°C. Hence, SrSDC can be used as an electrolyte for IT-SOFC applications.

Structural, optical and electrical properties of M 0.025 Sm 0.175 Ce 0.8 O 2- δ : an electrolyte for IT-SOFCs