Nickel-doped NdBa0.5Sr0.5Co1.5Fe0.5O5+δ oxygen electrode material for high performance reversible protonic ceramic cells
Source abstract
Abstract
To enhance the electrocatalytic activity in the oxygen reduction and the evolution reactions of air electrode materials, we fabricate a double perovskite structured NdBa 0.5Sr 0.5Co 1.5Fe 0.5-xNi xO 5+δ with triple-conducting properties for reversible protonic ceramic cells (RPCCs). In particular, Ni doping into B-site (of ABO 3 perovskite structure) is used to tailor the surface properties and bulk diffusion of NdBa 0.5Sr 0.5Co 1.5Fe 0.5O 5+δ perovskites. Among the various amounts of dopants, doping with 5 mol% Ni significantly increases the activity of oxygen electrodes in moist air, including the conductivity of protons and oxygen-ions. The area specific resistance (ASR) values of the NdBa 0.5Sr 0.5Co 1.5Fe 0.45Ni 0.05O 5+δ (NBSCFN5) electrode in the BaZr 0.1Ce 0.7Y 0.1Yb 0.1O 3-δ electrolyte are 0.70 Ω·cm 2 at 650 ℃. The electrical conductivity of NBSCFN5 is 423–714 S·cm −1 at the RPCCs operating temperature (500–700 ℃), which is significantly higher than that of the conventional perovskite air electrode materials. Furthermore, the ASR of the NBSCFN5 symmetrical cell decreases considerably from 9.02 to 6.86 Ω·cm 2 in dry air to pH 2O = 0.6 atm at 550 ℃, implying its excellent proton conduction. This suggests that NBSCFN5 is a promising air electrode material for next-generation high-performance RPCCs at lower temperatures.
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Research context
OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Fuel Cells and Related Materials · Advanced battery technologies research
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