Controlling the Oxygen Electrocatalysis on Perovskite and Layered Oxide Thin Films for Solid Oxide Fuel Cell Cathodes

Abstract

Achieving the fast oxygen reduction reaction (ORR) kinetics at the cathode of solid oxide fuel cells (SOFCs) is indispensable to enhance the efficiency of SOFCs at intermediate temperatures. Mixed ionic and electronic conducting (MIEC) oxides such as ABO3 perovskites and Ruddlesden-Popper (RP) oxides (A2BO4) have been widely used as promising cathode materials owing to their attractive physicochemical properties. In particular, oxides in forms of thin films and heterostructures have enabled significant enhancement in the ORR activity. Therefore, we aim to give a comprehensive overview on the recent development of thin film cathodes of SOFCs. We discuss important advances in ABO3 and RP oxide thin film cathodes for SOFCs. Our attention is also paid to the influence of oxide heterostructure interfaces on the ORR activity of SOFC cathodes.

Hydrogen Fuel Cell Vehicles; Current Status and Future Prospect

“…Table 1 shows some of the more common FCs and the type of membrane each uses. A common stationary power FC is a solid oxide fuel cell [41]. SOFCs conduct ions in a ceramic membrane at high temperatures.…”

Recent advances, practical challenges, and perspectives of intermediate temperature solid oxide fuel cell cathodes

“…Based on the conducting mechanism and the pathways for the ORR, cathode materials can be categorized into two groups: (i) pure electronic conducting materials, and (ii) mixed ionic-electronic conductors (MIECs). 6,8,119,302,303 In the first group, after the oxygen molecule has been adsorbed and dissociates on the perovskite surface, it migrates to the TPBs through surface diffusion where oxide ions form and incorporate into the electrolyte by electron transfer. Fig.…”

“…In this case, a porous electrode is required to provide more TPB sites for the ORR. 6,8,302–304 The second group consists of materials showing both electronic and ionic conductivity towards the ORR. As a result, the adsorbed oxygen can be transferred to the electrolyte via both surface and bulk diffusion not limited to the TPBs as illustrated in Fig.…”

Modelling and Controlling of ion transport rate efficiency in Proton exchange membrane (PEMFC), alkaline (AFC), direct methanol (DMFC), phosphoric acid (PAFC), direct forming acid(DFAFC) and direct carbon (DCFC) fuel cells

“…Here "j "means cathode or anode section and if j=anode then i= H2, H2O and if j= cathode then i = O2, N2, H2O, in addition KS is also used for denoting gas species. In the y-orientation, the gradient of mole fractions " " is given by where and are mole fractions in the catalyst and the thickness of gas diffusion, respectively meanwhile the molar fraction is given by ̅ ( [46][47][48][49][50]. Based on our previous works we have simulated the concepts of physical chemistry and computational methods for modeling the fuel cells to predict the high efficiency and mechanism of controlling [51-78].…”