The glasses in the series (35-x) BaO:65 P2O5:x (NH4)(2)SO4 are synthesized and characterized by T-g, CTE, density and electrical conductivity measurements. The decrease in density and T-g is observed with addition of (NH4)(2)SO4. The increase in CE compliments the observed variation in T-g. The protonic conductivity increases with addition of (NH4)(2)SO4 up to 7.5 mol% and decreases beyond this composition. The increase in the ratio of O/P, which in turn, creates more non-bridging oxygens, enhances the conductivity. Further, sulfur is mainly incorporated in sulfophosphate glasses as isolated SO42- group which also results in increase in conductivity. The glass with maximum conductivity [7.5(NH4)(2)SO4:27.5BaO:65 P2O5] is used to fabricate a fuel cell. It gives the power density of 12.43 mu W/cm(2). The power density of the fuel cell in the present work at room temperature is higher than that reported in literature at 473 K. The fuel cell has a potential of giving higher power density at higher temperature of 423 K. (c) 2015 Elsevier B.V. All rights reserved.