Significant Zirconium Substitution Effect on the Oxygen Reduction Activity of the Cathode Material NdBaCo₂O_5+δ for Solid Oxide Fuel Cells

Abstract

NdBaCo2O5+δ (NBCO) based double perovskite is an attractive cathode material with many advantages, yet its electrochemical performance still cannot meet the requirements. We first design and prepare Zr cation doping NdBaCo1.95Zr0.05O5+δ and systematically study the effects of Zr-doping on the oxygen kinetics, redox, and electrical properties of NdBaCo1.95Zr0.05O5+δ as cathode material for oxygen conduction SOFCs. NdBaCo1.95Zr0.05O5+δ show rapid oxygen bulk diffusion coefficients and surface exchange coefficients through zirconium cations doping, reaching 5.827 × 10–5 cm2·s–1 and 2.878 × 10–4 cm·s–1, respectively, at 700 °C, enabling the improved performance of oxygen reduction, and the polarization impedance is as low as 0.024 Ω·cm2.

High-Efficiency of Bi-Functional-Based Perovskite Nanocomposite for Oxygen Evolution and Oxygen Reduction Reaction: An Overview

“…From the scanning electron microscope (SEM) analysis, the unique morphological lattice structure, particle size and cathode porosity for NBCZrOare shown inFigure 7b. The typical EIS analysis can exhibit lower ASR values and the polarization impedance values can be reached at 0.006, 0.012, 0.024, 0.057 and 0.189 Ω cm −2 (applied temperatures 800, 750, 700, 650 and 600 • C), which indicates high ORR activity (Figure 7c) [59]. Interestingly, the crystal structure of cobalt-free BaFeO 3−δ (BF) perovskite has become an innovative new class of electrode catalyst, specifically the surface-active cathode materials that play an important role in the development of oxygen-ion conductivity for SOFCs and exhibit a power density value of 870 mW cm −2 [60].…”

“…From the scanning electron microscope (SEM) analysis, the unique morphological lattice structure, particle size and cathode porosity for NBCZrOare shown in Figure 7 b. The typical EIS analysis can exhibit lower ASR values and the polarization impedance values can be reached at 0.006, 0.012, 0.024, 0.057 and 0.189 Ω cm −2 (applied temperatures 800, 750, 700, 650 and 600 °C), which indicates high ORR activity ( Figure 7 c) [ 59 ].…”

“… ( a ) crystal structure, and ( b ) SEM images of the microstructure for NdBaCo 1.95 Zr 0.05 O 5+δ and ( c ) Typical impedance spectra of symmetric cells measured under an open-circuit condition. Copyright 2019 by the American Chemical Society [ 59 ]. …”

Robust in situ exsolved nanocatalysts on perovskite oxide as an efficient anode for hydrocarbon fueled solid oxide fuel cells

“…Mixed ionic and electronic conductor (MIEC) perovskite oxides are considered promising candidates due to their mixed ionic and electronic conductivities in recent years. 10–14 Their inherently densely packed structure exhibits numerous oxygen vacancies, which are beneficial to the diffusion of oxygen ions. 15–17 The possible application of various perovskite oxides for the SOFC anode has been investigated, such as La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3, (La 1− x Sr x ) 0.9 Cr 0.5 Mn 0.5 O 3− δ , Sr 2 Fe 1.5 Mo 0.5 O 6− δ , SrMo 1− x Ga x O 3− δ , etc.…”

Enhanced Electrochemical Performance of the Fe-Based Layered Perovskite Oxygen Electrode for Reversible Solid Oxide Cells

“…Herein, oxygen vacancy engineering is carried out in traditional excellent materials PrBaFe 2 O 5+δ and further the catalytic activity is enhanced through introducing a dopant. Zr 4+ has been chosen as the dopant in other research studies which have successfully regulated the oxygen vacancy concentration and simultaneously improved the performance. , Moreover, the stability of materials can also be improved through doping Zr 4+ . The results reveal that a larger lattice parameter, accompanied with Zr 4+ doping, is capable of increasing the concentration of oxygen vacancy and enabling faster oxygen ion diffusion.…”