Investigating the Electrochemical Properties of a Semiconductor Heterostructure Composite Based on WO3-CaFe2O4 Particles Planted on Porous Ni-Foam for Fuel Cell Applications

There is tremendous potential for both small- and large-scale applications of low-temperature operational ceramic fuel cells (LT-CFCs), which operate between 350 °C 550 °C. Unfortunately, the low operating temperature CFCs was hampered by inadequate oxygen reduction electrocatalysts. In this work, electrochemical characteristics a semiconductor heterostructure composite based on WO3-CaFe2O4 deposited over porous Ni-foam are investigated. At working temperatures 450–500 °C, developed pasted Ni–foam cathode exhibits very area-specific resistance (0.78 Ω cm2) high reaction (ORR) activity. For button-sized SOFCs with H2 atmospheric air fuels, we have demonstrated high-power densities 508 mW cm−2 running at even operation 450 using seeded cathode. Moreover, Ni foam paste activation energy compared to WO3 CaFe2O4 alone, supports ORR To comprehend enhanced electrocatalytic activity composite, several spectroscopic tests including X-ray diffraction (XRD), photoelectron spectroscopy (XPS), impedance (EIS) were used. The findings may also aid in creation useful cobalt-free electrocatalysts LT-SOFCs.