An innovative approach to design SOFC air electrode materials: high entropy La_1−xSr_x(Co,Cr,Fe,Mn,Ni)O_3−δ(x= 0, 0.1, 0.2, 0.3) perovskites synthesized by the sol–gel method

Abstract

Among reported for the first time Cr-containing high entropy La1-xSrx(Co,Cr,Fe,Mn,Ni)O3-δ (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) perovskite-type oxides, the selected Sr-doped La0.7Sr0.3(Co,Cr,Fe,Mn,Ni)O3-δ material is documented to possess...

High-entropy energy materials: challenges and new opportunities

“…18,67 The perovskite structure comprises at least two cation sublattices, both of which can be substituted and shared by multiple metals to form a variety of HECs. 43,[68][69][70][71][72] Other lattice structures, such as fluorite, 73-75 spinel 16,76,77 and layered oxides 13,55 were also identified and demonstrated their potential in various energy storage and conversion technologies (Fig. 2b).…”

“…10a). Furthermore, perovskite-type La 1Àx Sr x (FeNiMnCoCr)O 3Àd HEOs were synthesized by Dąbrowa et al 70 via a sol-gel method, showing potential as air electrode materials for application in solid oxide fuel cells (SOFCs).…”

Formation of Solid Solutions and Physicochemical Properties of the High-Entropy Ln1−xSrx(Co,Cr,Fe,Mn,Ni)O3−δ (Ln = La, Pr, Nd, Sm or Gd) Perovskites

“…The systematic structural data obtained with the respective refinement residuals are gathered in Table 1. The data for La(Co,Cr,Fe,Mn,Ni)O 3−δ come from our previous study [22]. Table 1.…”

“…Most recently, however, the interest in the B-site disordered LnTMO 3 high-entropy perovskites based on the Co, Cr, Fe, Mn, and Ni elements, has shifted toward their electrochemical performance. In the first study, Dąbrowa et al [22] carried out an initial assessment of the possibility of utilizing the high-entropy perovskites as air-electrode materials for solid oxide fuel cell technology (SOFCs) on the example of La 1−x Sr x (Co,Cr,Fe,Mn,Ni)O 3−δ perovskite. The introduction of Sr allowed the transport properties of the studied perovskites to be significantly enhanced, by means of both bandwidth and filling control mechanisms [23].…”

“…This allows for both, control over the angle between neighboring TMO 6 octahedra, which governs the effectiveness of the 3d TM -2p O orbitals overlapping (bandwidth control [23]), and modification of the charge of B-site ions (including their multivalency), thanks to the presence of the (respective) charge compensation mechanism (filling control) [23]. The possibility of such modifications of the LnTMO 3 high-entropy perovskites has already been successfully proven in [22]. Still, the selection of the A-site lanthanide is expected to play an equally important role concerning the overall properties of the system, directly influencing electronic and ionic conductivity [19], thermomechanical and magnetic properties [20,29], but also indirectly affecting the system through different available alkaline-earth dopant solubility limit [30].…”