New reduced-temperature ceramic fuel cells with dual-ion conducting electrolyte and triple-conducting double perovskite cathode

Zhou, Chuan; Sunarso, Jaka; Song, Yufei; Dai, Jie; Zhang, Junxing; Gu, Binbin; Zhou, Wei; Shao, Zongping

doi:10.1039/c9ta03501j

Cited by 142 publications

(101 citation statements)

References 40 publications

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“…[ 7,8 ] Based on the theoretical conductivity of benchmark proton‐conducting electrolytes, such as BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3− δ (BZCYYb), the ohmic resistance of a thin‐film electrolyte with the thickness of ≈10 µm is still affordable for operating at a temperature down to 450 °C. [ 9,10 ] In the past decade, tremendous efforts have been made in the fabrication of thin‐film proton‐conducting electrolytes and significant progress has been gained. [ 11–14 ] For example, spray casting, spin coating, screen printing, and sintering aid have turned out to be effective methods in preparing high‐quality proton‐conducting electrolytes with mass production capabilities.…”

Section: Introductionmentioning

confidence: 99%

Building Ruddlesden–Popper and Single Perovskite Nanocomposites: A New Strategy to Develop High‐Performance Cathode for Protonic Ceramic Fuel Cells

Shi

et al. 2021

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Here a new strategy is unveiled to develop superior cathodes for protonic ceramic fuel cells (PCFCs) by the formation of Ruddlesden–Popper (RP)‐single perovskite (SP) nanocomposites. Materials with the nominal compositions of LaSrxCo1.5Fe1.5O10−δ (LSCFx, x = 2.0, 2.5, 2.6, 2.7, 2.8, and 3.0) are designed specifically. RP‐SP nanocomposites (x = 2.5, 2.6, 2.7, and 2.8), SP oxide (x = 2.0), and RP oxide (x = 3.0) are obtained through a facile one‐pot synthesis. A synergy is created between RP and SP in the nanocomposites, resulting in more favorable oxygen reduction activity compared to pure RP and SP oxides. More importantly, such synergy effectively enhances the proton conductivity of nanocomposites, consequently significantly improving the cathodic performance of PCFCs. Specifically, the area‐specific resistance of LSCF2.7 is only 40% of LSCF2.0 on BaZr0.1Ce0.7Y0.2O3−δ (BZCY172) electrolyte at 600 °C. Additionally, such synergy brings about a reduced thermal expansion coefficient of the nanocomposite, making it better compatible with BZCY172 electrolyte. Therefore, an anode‐supported PCFC with LSCF2.7 cathode and BZCY172 electrolyte brings an attractive peak power output of 391 mW cm−2 and excellent durability at 600 °C.

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Section: Introductionmentioning

confidence: 99%

Building Ruddlesden–Popper and Single Perovskite Nanocomposites: A New Strategy to Develop High‐Performance Cathode for Protonic Ceramic Fuel Cells

Shi

et al. 2021

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“…However, many proton-conducting oxides suffer from poor chemical stability under CO2, H2O or reducing atmospheres 14,19,20,21,22,23 , and also have low sinterability, thus requiring very high processing temperatures ( 1700 °C) 14, 24. Recently, materials with dual-ion proton and oxide ion conductivity have been proposed as a new class of electrolyte for intermediate temperature fuel cells, as they exhibit low ohmic resistance without external gas humidification 25,26 .…”

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confidence: 99%

High oxide ion and proton conductivity in a disordered hexagonal perovskite

et al. 2020

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Oxide ion and proton conductors, which exhibit high conductivity at intermediate temperature, are necessary to improve the performance of ceramic fuel cells. The crystal structure plays a pivotal role in defining the ionic conduction properties and the discovery of new materials is a challenging research focus. Here we show that the undoped hexagonal perovskite Ba7Nb4MoO20 supports pure ionic conduction with high proton and oxide ion conductivity at 510 °C (the bulk conductivity is 4.0 mS cm-1) and hence is an exceptional candidate for application as a dual-ion solid electrolyte in a ceramic fuel cell which will combine the advantages of both oxide ion and proton conducting electrolytes. Ba7Nb4MoO20 also showcases excellent chemical and electrical stability. Hexagonal perovskites form an important new family of materials for obtaining novel ionic conductors with potential applications in a range of energy-related technologies.

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“…This decrease in total conductivity can be somewhat attributed to the increase in lattice constant with Y substitution, as the Y 3+ ion is larger than the Zr 4+ ion. The BCFZYX materials also show significantly lower electronic conductivity compared to other triple-conducting cathode materials such as SSNCF [24], BSCF [37,38], and PrBa0.5Sr0.5Co1.5Fe0.5O5+δ (PBSCF) [5,39].…”

Section: Conductivitymentioning

confidence: 98%

“…Instead, permeation is a widely used technique to probe the ionic conductivity in dominant electronic conductors such as MIECs and TIECs [21][22][23]. Zhou et al recently utilized ECR and permeation methods to report a new cathode material Sr2Sc0.1Nb0.1Co1.5Fe0.3O6−δ (SSNCF) with both performance data and bulk property data compared to a well-known material Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) [24]. Despite recent developments, there remains a large literature gap in bulk property data for many claimed triple-conductors.…”

Section: Introductionmentioning

confidence: 99%

Surface and Bulk Oxygen Kinetics of BaCo0.4Fe0.4Zr0.2−XYXO3−δ Triple Conducting Electrode Materials

et al. 2021

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Triple ionic-electronic conductors have received much attention as electrode materials. In this work, the bulk characteristics of oxygen diffusion and surface exchange were determined for the triple-conducting BaCo0.4Fe0.4Zr0.2−XYXO3−δ suite of samples. Y substitution increased the overall size of the lattice due to dopant ionic radius and the concomitant formation of oxygen vacancies. Oxygen permeation measurements exhibited a three-fold decrease in oxygen permeation flux with increasing Y substitution. The DC total conductivity exhibited a similar decrease with increasing Y substitution. These relatively small changes are coupled with an order of magnitude increase in surface exchange rates from Zr-doped to Y-doped samples as observed by conductivity relaxation experiments. The results indicate that Y-doping inhibits bulk O2− conduction while improving the oxygen reduction surface reaction, suggesting better electrode performance for proton-conducting systems with greater Y substitution.

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New reduced-temperature ceramic fuel cells with dual-ion conducting electrolyte and triple-conducting double perovskite cathode

Abstract: New reduced-temperature ceramic fuel cells with dual-ion conducting electrolyte and triple conducting double perovskite cathode.

Cited by 142 publications

References 40 publications

Building Ruddlesden–Popper and Single Perovskite Nanocomposites: A New Strategy to Develop High‐Performance Cathode for Protonic Ceramic Fuel Cells

Building Ruddlesden–Popper and Single Perovskite Nanocomposites: A New Strategy to Develop High‐Performance Cathode for Protonic Ceramic Fuel Cells

High oxide ion and proton conductivity in a disordered hexagonal perovskite

Surface and Bulk Oxygen Kinetics of BaCo0.4Fe0.4Zr0.2−XYXO3−δ Triple Conducting Electrode Materials

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