Grain boundary space charge modulation in BaZr0.8Y0.2-xMxO3−δ with transition metal (M= Ni, Co, Fe, and Zn) co-doping

Aarthi, U.; Moorthy, Suresh Babu Krishna

doi:10.1016/j.ijhydene.2020.07.207

Cited by 23 publications

(14 citation statements)

References 44 publications

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“…This would create a more uniform charge distribution leading to a decreasing of space charge potential effect. This was already observed and validated in the literature for Gd-doped ceria electrolytes [71,72]. Irrespective of grain boundary development details, the actual trend in the overall conductivity (the most relevant technological feature for applications) of CCO-SG materials is competitive with respect to rare earth-doped ceria [56].…”

Section: Samplesupporting

confidence: 71%

Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells

Garcia

Araújo

Raimundo

et al. 2021

International Journal of Hydrogen Energy

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Section: Samplesupporting

confidence: 71%

Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells

Garcia

Araújo

Raimundo

et al. 2021

International Journal of Hydrogen Energy

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“…On the other hand, the opposing preconditions of large-sized grains with no grain boundary (ideal case) in PCs are due to the high activation barrier imposed by the grain boundary toward proton mobility over oxide ions. 200 Fu and Weng 85 as a result monitored the effects of rare earth-doped BaCeO 3 with respect to multiple parameters. In light of the influence of different rare earth-doped BaCeO 3 over the host's morphology, the study spotlights a sign for improvement on the chemical stability against variable atmospheres and proton conductivity fluctuations.…”

Section: Microstructural Disorder Over Perturbed Protonmentioning

confidence: 99%

“…Such microstructural prerequisites with oxide ion conductors are due to the delocalized hopping and the dilution of impurities across the grain boundary region. On the other hand, the opposing preconditions of large-sized grains with no grain boundary (ideal case) in PCs are due to the high activation barrier imposed by the grain boundary toward proton mobility over oxide ions …”

Section: Impact Of Acceptor Dopant On Perovskite Type Baceo3 Proton C...mentioning

confidence: 99%

Technological Challenges and Advancement in Proton Conductors: A Review

Vignesh

Rout

2023

Energy Fuels

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Proton conductors (PCs) are multifunctional perovskite materials with structural, electrical, and chemical compatibilities that serve as principal components in proton conducting solid oxide fuel cells (PC-SOFC). The synergetic advantages of PC-SOFC dominate lucrative applications of conventional SOFC. However, adequate advantages accompany certain key limitations in PCs. The inverse interplay between proton conductivity and chemical stability are two broader challenges which demonstrate a clear trade-off. As a consequence, different reactive constituents within the host BaCeO 3 and BaZrO 3 PCs enforce the gradient in chemical stability under diverse atmospheres, while altered charge chemistry and structural perturbations escalate the activation barrier and impose reduced proton conductivity. Such occurrences are more pronounced in acceptor-doped PCs. Although material engineering via acceptor defect substitutions assists protonation and charge dynamics, on the other hand, it provokes novel challenges (proton trapping effect) at a higher dopant volume fraction beyond the threshold. The principal entropy among chemical and electrophysical parameters is proportionally associated with dopant-incorporated subcategorical material limitations. In this study, a compilation of factors responsible for structural and electrophysical diversities as a consequence of compositional-induced symmetry variations is highlighted with a plausible conclusion and future research perspectives for smart and advanced energy applications.

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“…Therefore, it is very important to investigate the effect of the solid solution of transition metals in the BZYb electrolyte on the proton conductivity and proton transport number to discuss and improve the performance and durability of PCFCs. The proton conductivity of some proton ceramics decreases because of the solid solution of transition-metal elements. ,− However, the effects of the species and amounts of transition metals added on the proton transport properties of BZYb have not been clarified.…”

Section: Introductionmentioning

confidence: 99%

Effect of Transition Element Dissolution on Ytterbium-Doped Barium-Zirconate-Based Protonic Ceramic Fuel Cells

Mikami,

Sekitani,

Yamauchi

et al. 2024

ACS Appl. Energy Mater.

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Protonic ceramic fuel cells (PCFCs) use a proton-conducting oxide as the electrolyte, leading to a high power density and energy conversion efficiency at intermediate temperatures. Ytterbium-doped barium zirconate has a high proton conductivity and chemical stability against carbon dioxide, making it an attractive electrolyte material for PCFCs. The durability of fuel cells is a critical issue for realizing practical applications of PCFCs, and dissolution of the transition metals from the electrodes into the electrolyte is expected to decrease the durability. In this study, we investigated the effect of dissolution of transition metals (Ni, Co, Fe, and Mn) into BaZr 0.8 Yb 0.2 O 3−δ on the proton transport properties and on the cell properties. The proton conductivity and proton transport number decreased with an increasing concentration of transition-metal elements, and the Co was found to have a particularly large effect on the material properties of BaZr 0.8 Yb 0.2 O 3−δ . As for cell properties, anode-supported PCFCs with different cathode firing temperatures were evaluated. The OCV and the maximum power density were low in the cell with high concentrations of Co and Fe in the BaZr 0.8 Yb 0.2 O 3−δ electrolyte, suggesting the decrease of proton transport number due to dissolution of Co and Fe. Furthermore, based on the measured proton transport properties, the effects of transition-metal dissolution on the power density and energy efficiency of PCFCs were estimated, and the trends were consistent with the results of the cell test. These results indicate that the dissolution of transition metals, especially Co, has a significant effect on the performance and durability of PCFCs using the BaZr 0.8 Yb 0.2 O 3−δ electrolyte.

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Grain boundary space charge modulation in BaZr0.8Y0.2-xMxO3−δ with transition metal (M= Ni, Co, Fe, and Zn) co-doping

Cited by 23 publications

References 44 publications

Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells

Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells

Technological Challenges and Advancement in Proton Conductors: A Review

Effect of Transition Element Dissolution on Ytterbium-Doped Barium-Zirconate-Based Protonic Ceramic Fuel Cells

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