Enhanced Cr-tolerance of an SOFC cathode by an efficient electro-catalyst coating

Pei, Kai; Zhou, Yucun; Xu, Kang; He, Zuyun; Chen, Yan; Zhang, Weilin; Yoo, Seonyoung; Zhao, Bote; Yuan, Wei; Liu, Meilin; Chen, Yu

doi:10.1016/j.nanoen.2020.104704

Cited by 69 publications

(47 citation statements)

References 32 publications

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“…Recently, we found that the BaCoO 3− x coating dramatically enhanced the Cr tolerance of the LSCF cathode. [ 29 ] Similar effect was also observed for BaO‐coated electrode. [ 26 ] Our recent work demonstrated that the multiphase (MP) catalyst coating was more efficient in enhancing the activity and stability of the LSCF cathode than most single‐phase catalysts.…”

Section: Introductionsupporting

confidence: 71%

“…[20][21][22][23] Surface modification with catalyst coatings has been demonstrated as an effective strategy to enhance the ORR activity and contaminant tolerance of cathodes. [24][25][26][27][28][29] The catalyst coatings can increase the number of ORR active sites and protect LSCF from reacting with contaminates. [20,[30][31][32][33] Several types of catalysts have been developed, including precious metals (e.g., Pd, Ag, and Ru), oxygen ion-conducting oxides (Sm 0.2 Ce 0.8 O 2−δ [SDC], [34] and Gd 0.2 Ce 0.8 O 1.9 (GDC)), [33,35] mixed ionic and electronic conductors (e.g., LSCF, [36] Sm 0.5 Sr 0.5 CoO 3−δ (SSC), [36] and PrSrCoMnO 6−δ , [25] etc.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Oxygen Reduction Activity and Cr Tolerance of Solid Oxide Fuel Cell Cathodes by a Multiphase Catalyst Coating

Niu

Zhou

et al. 2021

Adv Funct Materials

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Intermediate temperature solid oxide fuel cells (IT‐SOFCs) are cost‐effective and efficient energy conversion systems. The sluggish oxygen reduction reaction (ORR) and the degradation of cathodes are critical challenges to the commercialization of IT‐SOFCs. Here, a highly efficient multiphase (MP) catalyst coating, consisting of Ba1−xCo0.7Fe0.2Nb0.1O3−δ (BCFN) and BaCO3, to enhance the ORR activity and durability of the state‐of‐the‐art lanthanum strontium cobalt ferrite (La0.6Sr0.4Co0.2Fe0.8O3−δ, LSCF) cathode is reported. The conformal MP catalyst‐coated LSCF cathode shows a polarization resistance (Rp) of 0.048 Ω cm2 at 650 °C, about one order of magnitude smaller than that of the bare LSCF. In an accelerated Cr‐poisoning test, the degradation rate of the catalyst‐coated LSCF electrode is 10−3 Ω cm2 h−1 (0.59% h−1) over 200 h, only one fifth of the degradation rate of the bare LSCF electrode at 750 °C. In addition, anode‐supported single cells with the MP catalyst‐coated LSCF cathode show a dramatically enhanced peak power density (1.4 W cm−2 vs 0.67 W cm−2 at 750 °C) and increased durability against Cr and H2O. Both experimental results and density functional theory‐based calculations indicate that the BCFN phase improves the ORR activity while the BaCO3 phase enhances the stability of the LSCF cathode.

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Section: Introductionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Enhancing Oxygen Reduction Activity and Cr Tolerance of Solid Oxide Fuel Cell Cathodes by a Multiphase Catalyst Coating

Niu

Zhou

et al. 2021

Adv Funct Materials

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“…In another study, Chen et al [288] reported that the infiltration of multi-phase catalyst coatings composed of BaCoO 3−x (BCO) and PrCoO 3−x (PCO) nanoparticles and conformal PBCC thin films on LSCF led to much better performances with excellent durability as compared with bare LSCF cells within 250 h. The coating of BCO on LSCF can significantly suppress Sr surface segregation and enhance operating stability during exposure to Cr contamination [289].…”

Section: Surface Modificationmentioning

confidence: 99%

Surface Segregation in Solid Oxide Cell Oxygen Electrodes: Phenomena, Mitigation Strategies and Electrochemical Properties

Chen

Jiang

2020

Electrochem. Energ. Rev.

119

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Solid oxide cells (SOCs) are highly efficient and environmentally benign devices that can be used to store renewable electrical energy in the form of fuels such as hydrogen in the solid oxide electrolysis cell mode and regenerate electrical power using stored fuels in the solid oxide fuel cell mode. Despite this, insufficient long-term durability over 5–10 years in terms of lifespan remains a critical issue in the development of reliable SOC technologies in which the surface segregation of cations, particularly strontium (Sr) on oxygen electrodes, plays a critical role in the surface chemistry of oxygen electrodes and is integral to the overall performance and durability of SOCs. Due to this, this review will provide a critical overview of the surface segregation phenomenon, including influential factors, driving forces, reactivity with volatile impurities such as chromium, boron, sulphur and carbon dioxide, interactions at electrode/electrolyte interfaces and influences on the electrochemical performance and stability of SOCs with an emphasis on Sr segregation in widely investigated (La,Sr)MnO3 and (La,Sr)(Co,Fe)O3−δ. In addition, this review will present strategies for the mitigation of Sr surface segregation. Graphic Abstract

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“…Recently, we developed a BaCoO 3−δ (BCO) nanoparticle coating on LSCF to enhanced the ORR/OER activity and durability of the air electrode for both oxygen ionconducting fuel cells and R-PCECs. [29,36] Despite the excellent activity, degradation of the catalyst-coated electrode was still observed, due likely to insufficient protection of the LSCF electrode since the BCO nanoparticles were not able to form a conformal coating to cover the whole LSCF surface. [19] In this work, a new multiphase (MP) catalyst coating, composed of a conformal Pr 1−x Ba x CoO 3−δ (PBC) thin film and in situ exsolved BCO nanoparticles, has been developed for LSCF air electrodes of R-PCECs by infiltration (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Highly Active and Durable Air Electrodes for Reversible Protonic Ceramic Electrochemical Cells Enabled by an Efficient Bifunctional Catalyst

Niu

Zhou

Zhang

et al. 2022

Advanced Energy Materials

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The commercialization of reversible protonic ceramic electrochemical cells is hindered by the lack of highly active and durable air electrodes exposed to high concentration of steam under operating conditions. Here, findings that dramatically enhance the electrocatalytic activity and stability of a conventional (La0.6Sr0.4)0.95Co0.2Fe0.8O3−δ (LSCF) air electrode by a multiphase catalyst coating composed of a conformal Pr1−xBaxCoO3−δ thin film and exsolved BaCoO3−δ nanoparticles, are reported. At 600 °C, the catalyst coating decreases the polarization resistance of the LSCF air electrode by a factor of 25 (from 1.09 to 0.043 Ω cm2) in air and the degradation rate by two orders of magnitude (from 1.0 × 10−2 to 1.8 × 10−4 Ω cm2 h−1 in humidified air with 30 vol% H2O). Further, a single cell with the catalyst‐coated LSCF air electrode at 600 °C demonstrates a high peak power density of 1.04 W cm−2 in the fuel cell mode and a high current density of 1.82 A cm−2 at 1.3 V in the electrolysis mode. The significantly enhanced performance of the LSCF air electrode is attributed mainly to the high rate of surface oxygen exchange, fast surface proton diffusion, and the rapid H2O and O2 dissociation on the catalysts.

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Enhanced Cr-tolerance of an SOFC cathode by an efficient electro-catalyst coating

Cited by 69 publications

References 32 publications

Enhancing Oxygen Reduction Activity and Cr Tolerance of Solid Oxide Fuel Cell Cathodes by a Multiphase Catalyst Coating

Enhancing Oxygen Reduction Activity and Cr Tolerance of Solid Oxide Fuel Cell Cathodes by a Multiphase Catalyst Coating

Surface Segregation in Solid Oxide Cell Oxygen Electrodes: Phenomena, Mitigation Strategies and Electrochemical Properties

Highly Active and Durable Air Electrodes for Reversible Protonic Ceramic Electrochemical Cells Enabled by an Efficient Bifunctional Catalyst

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