Abstract
The chemical design of new functional materials for solid oxide fuel cells (SOFCs) is of great interest as a means for overcoming the disadvantages of traditional materials. Redox stability, carbon deposition and sulfur poisoning of the anodes are positioned as the main processes that result in the degradation of SOFC performance. In this regard, double perovskite molybdates are possible alternatives to conventional Ni-based cermets. The present review provides the fundamental properties of four members: Sr2NiMoO6-δ, Sr2MgMoO6-δ, Sr2FeMoO6-δ and Sr2Fe1.5Mo0.5O6-δ. These properties vary greatly depending on the type and concentration of the 3d-element occupying the B-position of A2BB’O6. The main emphasis is devoted to: (i) the synthesis features of undoped double molybdates, (ii) their electrical conductivity and thermal behaviors in both oxidizing and reducing atmospheres, as well as (iii) their chemical compatibility with respect to other functional SOFC materials and components of gas atmospheres. The information provided can serve as the basis for the design of efficient fuel electrodes prepared from complex oxides with layered structures.
Highlights
The development of solid oxide fuel cells (SOFCs) capable of generating electricity by means of a single-step electrochemical approach has been an urgent task since the midnineteenth century
This is due to the degradation of nickel-based anodes caused by carbonization and sulfur poisoning, which leads to a decrease in SOFC lifetime [4,5,6,7,8,9]
SOFCs is mostly motivated by motivated the fact that body research on SOFCs is mostly bythey the fact that they can efficientlycan generate electricity overelectricity a wide temperature do not range, containdo liquid efficiently generate over a widerange, temperature not contain liquid phases, do notphases, requiredo thenot presence noble metals allow for the of various types requireofthe presence ofand noble metals anduse allow for the use of various types of fuels [48,49,50,51,52,53,54,55,56]
Summary
The development of solid oxide fuel cells (SOFCs) capable of generating electricity by means of a single-step electrochemical approach has been an urgent task since the midnineteenth century. With the development of conventional SOFCs, in which YSZ (yttria-stabilized zirconia) acts as an electrolyte and Ni-based cermets serve as anodes, a cheaper and more accessible hydrocarbon fuel (natural gas, biogas, etc.) cannot be used. This is due to the degradation of nickel-based anodes caused by carbonization and sulfur poisoning, which leads to a decrease in SOFC lifetime [4,5,6,7,8,9]. Materials 2021, 14, 1715 In terms of chemical design, there are many alternative materials for Ni-based com of 28 posites They include Mo-containing double perovskites with the general formula.
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