Review—Double-Perovskite Electrode Design Strategies and Research Progress for SOFCs

Abstract

Since the double perovskite oxides Sr2Mg1-xMnxMoO6- were reported as anode materials for solid oxide fuel cells (SOFCs) by Professor Goodenough in 2006, they have attracted increasing interest in the past decades. This article reviews the latest progress of double perovskite electrode materials in crystal structure, ion-electron conducting model, catalytic activity, degradation mechanism and optimizing strategies. Their advantages, disadvantages, and electrochemical performances as SOFC electrodes have been discussed through extensive analysis of the literatures. Particular emphasis has been directed towards basic principles and various affecting factors regarding the performance and stability for the double perovskite oxides and their composites. The solutions to overcome the drawbacks of double perovskite electrodes, including element substitution, defect engineering and so on, have also been demonstrated.

The discovery of cathode materials for lithium‐ion batteries from the view of interdisciplinarity

“…[35] The Sr 2 Mg 1−x Mn x MoO 6−δ and the derivative anodes showed high power densities in both H 2 and CH 4 fuels. [36][37][38] Most importantly, with natural gas as fuel, they exhibited long-term stability and high tolerance to sulfur poisoning. The excellent electrochemical performance is mainly attributed to their structure and composition.…”

Advancements in Perovskite‐Based Cathode Materials for Solid Oxide Fuel Cells: A Comprehensive Review

“…[131] Thus, surface oxygen vacancies and transition metal ions within the ordered-structured DP oxides greatly affect oxygen adsorption and ORR activity. [132,133] Therefore, using these oxides as cathode materials in SOFCs could help improve their competitiveness in the energy market. However, the presence of other contaminated gases in ambient air such as CO 2 , and SO 2 may degrade these structures due to the possible reaction between contaminated gases with the alkali/alkaline earth metal oxides.…”

“…[151] As a result, several researchers have investigated the partial substitution of transition metals like Fe, Cu, Mn, and Ni at the Co-site to suppress the spin state of Co, thereby leading to a reduction in the Co content. [133,152] The optimum amount of these dopants may lead to a match TEC value with electrolytes yet compromising the outstanding electrical conductivity and ORR capabilities of Co-rich perovskites. For example, incorporating the optimum Ni (x = 0.4) at the Co-site in NdBaCo 1x Ni x O 5 + δ, the tetragonal structured DP showed high ORR activity and matched TEC values with electrolyte in SOFC.…”

An acidity-regulated double perovskite cathode for efficient and durable power generation of intermediate-temperature solid oxide fuel cells

“…The distinct crystal structure of these oxides, driven by the substantial ionic radius difference between lanthanide and barium elements, results in an ordered distribution of A-site cations alternating between Ln-O and Ba-O layers along the c-axis. 20,21 This structural arrangement facilitates the formation of oxygen vacancies in the Ln-O layers, enabling swi oxygen-ion diffusion and surface exchange. 22 For instance, PrBaCo 2 O 5+d exhibits high chemical oxygen surface exchange coefficient (k chem ) and oxygen bulk diffusion coefficient (D chem ) values of 3.1 × 10 −4 cm s −1 and 9.2 × 10 −6 cm 2 s −1 , along with a low polarization resistance (R p ) of 0.274 U cm 2 at 650 °C.…”