Tailoring electronic structure of perovskite cathode for proton-conducting solid oxide fuel cells with high performance

Xu, Xi; Xu, Yangsen; Ma, Jinming; Yin, Yanru; Fronzi, Marco; Wang, Xianfen; Bi, Lei

doi:10.1016/j.jpowsour.2021.229486

Cited by 94 publications

(45 citation statements)

References 67 publications

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“…New cathodes with mixed conductivity based on simple perovskite (doped LaCoO 3 , BaCoO 3 , and LaFeO 3 ) have been extensively studied [8][9][10][11][12][13]. Considering high oxygen-ion defect concentration, oxygen diffusion anisotropy, and cation ordered-structure, several recent studies have highlighted the promising of the Ruddlesden-Popper (RP) series, A n+1 BnO 3n+1 , for cathode application, where the special sandwich structure consists of n ABO 3 perovskite and two AO rock salt layers [14][15][16][17][18][19]. The Sr 3 Fe 2 O 7-δ -based systems, belonging to the n = 2 series, have been widely investigated owing to their high oxygen deficiency, excellent water-intercalation property, and prominent catalytic activity [20][21][22].…”

Section: Introduction mentioning

confidence: 99%

New two-layer Ruddlesden—Popper cathode materials for protonic ceramics fuel cells

Ling

Guo

et al. 2021

J Adv Ceram

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New two-layer Ruddlesden—Popper (RP) oxide La0.25Sr2.75FeNiO7−δ (LSFN) in the combination of Sr3Fe2O7−δ and La3Ni2O7−δ was successfully synthesized and studied as the potential active single-phase and composite cathode for protonic ceramics fuel cells (PCFCs). LSFN with the tetragonal symmetrical structure (I4/mmm) is confirmed, and the co-existence of Fe3+/Fe4+ and Ni3+/Ni2+ couples is demonstrated by X-ray photoelectron spectrometer (XPS) analysis. The LSFN conductivity is apparently enhanced after Ni doping in Fe-site, and nearly three times those of Sr3Fe2O7−δ, which is directly related to the carrier concentration and conductor mechanism. Importantly, anode supported PCFCs using LSFN-BaZr0.1Ce0.7Y0.2O3−δ (LSFN-BZCY) composite cathode achieved high power density (426 mW·cm−2 at 650 °C) and low electrode interface polarization resistance (0.26 Ω·cm2). Besides, distribution of relaxation time (DRT) function technology was further used to analyse the electrode polarization processes. The observed three peaks (P1, P2, and P3) separated by DRT shifted to the high frequency region with the decreasing temperature, suggesting that the charge transfer at the electrode-electrolyte interfaces becomes more difficult at reduced temperatures. Preliminary results demonstrate that new two-layer RP phase LSFN can be a promising cathode candidate for PCFCs.

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Section: Introduction mentioning

confidence: 99%

New two-layer Ruddlesden—Popper cathode materials for protonic ceramics fuel cells

Ling

Guo

et al. 2021

J Adv Ceram

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“…Today, economically competitive SOFC systems already exist, apparently ready for commercialization, but the widespread penetration of the technology into the market requires constant innovation of materials and manufacturing processes to increase the system service life and reduce the costs [9]. Among the numerous types of FC, such as alkaline FC [10,11], FCs with proton-exchange membrane [12][13][14], FCs based on carbon compounds [15,16], solid oxide fuel cells (SOFCs) based on oxygen-conducting solid electrolytes, which have a high efficiency (up to 60%) and can use not only pure hydrogen but also various hydrocarbons as a fuel, should be highlighted. The main structural components of these SOFCs are porous electrodes (anode and cathode) and a solid gas-tight electrolyte (ZrO 2 : Y 2 O 3 (YSZ)) located between them [1].…”

Section: Introductionmentioning

confidence: 99%

“…Water and CO 2 are the main reaction products on the anode part. The known most effective material for the creation of anodes is the so-called "cermet", which is a composite based on Ni (or NiO) and YSZ [9,[8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Porous Nickel Based Half-Cell Solid Oxide Fuel Cell and Thin-Film Yttria-Stabilized Zirconia Electrolyte

Umirzakov

Mereke

Shaikenova

et al. 2021

Eurasian Chem. Tech. J.

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In this work, a porous nickel anode for thin-film solid oxide fuel cell prepared by the simple powder hot-pressing method is investigated. Powders of Ni and pore-forming agent (PFA) were thoroughly mixed in different ratios, pressed in a mold and further sintered. The polishing technique with Yttria-Stabilized Zirconia (YSZ) powder has been developed to decrease the surface roughness of Ni-based anode in order to deposit a crack-free electrolyte layer. The 3 μm YSZ thin-film electrolyte was deposited by the pulsed laser deposition technique on the surface of the anode. Morphological and elemental analyses of the samples were characterized by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analyses. X-ray diffraction was used for phase analysis and structural characterization. The specific surface areas of the resulting anodes were calculated from their isotherms of N2 adsorption and desorption using the Sorbtometer and calculated by Brunauer Emmett-Teller (BET) method. As a result, the highest mechanical strength and specific surface area (15.42 m2g-1) possessed a sample with the content of PFA equal to 40%, while its ionic conductivity at 800 °C reached 6. 4∙10-2 S/cm.

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“…The positrode performance is what limits current electrochemical devices based on PCCs and much effort was put into their development [ 10 , 11 , 12 , 13 ]. Recently, we have focused on the group of BaLnCo 2 O 6 (Ln—a lanthanide) perovskite compounds that showed promising properties for application as positrodes [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…A potential solution to this problem might be the partial substitution of cobalt with iron. This may decrease the thermal expansion coefficient (TEC) [ 19 ] and improve the water uptake, and therefore the protonic partial conductivity of the compound, since the increase of the average basicity at the B-site is reported to have that effect [ 11 , 20 ]. Therefore, we selected Ba 0.5 La 0.5 Co 0.5 Fe 0.5 O 3 (BLCF) as the material for this study, as it should both show the benefits of cobaltites, such as high electronic conductivity and catalytic activity, and improved proton conductivity combined with reduced TEC value of ferrites.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Design of Ba0.5La0.5Co0.5Fe0.5O3 Perovskite Ceramics

et al. 2021

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Ba0.5La0.5Co0.5Fe0.5O3−δ was synthesized in the solid-state reaction route. The influence of ball milling parameters (such as milling media size, angular velocity, and time), pelletizing pressure, and annealing parameters on the microstructure was studied. The grain size distribution and density or specific surface area changes were investigated in each approach while the individual parameters were changed. The evaluation of BLCF synthesis parameters enables tailoring the microstructure to various applications. It was observed that with lowering the size of milling balls and increasing the angular velocity the material will be porous and thus more appropriate as electrode material in proton ceramic fuel cell or electrolyzer. An increase of time, balls diameter, and/or angular velocity of milling enables one to densify the material in case of membrane application in, e.g., as a gas sensor. The significant influence on densification has also annealing temperature increase. Applying 1200 °C during annealing leads to dense material, while at 1100 °C shows visible porosity of the product. In this work, we present the results of the BLCF synthesis parameters change allowing the selection of appropriate parameter values depending on the further application as PCCs.

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Tailoring electronic structure of perovskite cathode for proton-conducting solid oxide fuel cells with high performance

Cited by 94 publications

References 67 publications

New two-layer Ruddlesden—Popper cathode materials for protonic ceramics fuel cells

New two-layer Ruddlesden—Popper cathode materials for protonic ceramics fuel cells

Porous Nickel Based Half-Cell Solid Oxide Fuel Cell and Thin-Film Yttria-Stabilized Zirconia Electrolyte

Microstructural Design of Ba0.5La0.5Co0.5Fe0.5O3 Perovskite Ceramics

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