Tuning the defects of the triple conducting oxide BaCo0.4Fe0.4Zr0.1Y0.1O3−δ perovskite toward enhanced cathode activity of protonic ceramic fuel cells

Ren, Rongzheng; Wang, Zhenhua; Chen, Xu; Sun, Wang; Qiao, Jinshuo; Rooney, David; Sun, Kening

doi:10.1039/c9ta04335g

Cited by 166 publications

(99 citation statements)

References 43 publications

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“…The proton conduction in perovskite oxides is mainly through hydroxide defects that can be generated by the dissociative adsorption of water in oxygen vacancies. [ 61 ] The peak (P2′) within the τ range of 10 −3 –10 −4 s was also observed in the DRT curves for the LSCFx electrodes on the BZCY172 electrolyte, while its intensity was slightly increased compared with that on the SDC electrolyte. As we all know, the air used in PCFCs is humidified, and the water in the air will be competitively adsorbed in the oxygen vacancies of the electrode, thus inhibiting the charge transfer of oxygen ions.…”

Section: Resultsmentioning

confidence: 77%

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: Resultsmentioning

confidence: 77%

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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“…Very recently, Ren et al designed a novel A‐site‐deficient B x CFZY (Ba x Co 0.4 Fe 0.4 Zr 0.1 Y 0.1 O 3‐δ , x = 1, 0.95, 0.9) to promote the oxygen diffusion and hydration kinetics in the BCFZY material (Figure 15). 176 The as‐designed Ba‐deficiency introduced more oxygen vacancies and protonic defects due to the charge compensation mechanism. The PCFC based on the Ba‐deficient B x ZFCY cathode (Ni‐BZCY/BZCY electrolyte/B 0.9 CFZY cathode) showed a power density of 376.27 mW cm −2 at 500°C, demonstrating an effective strategy to tune the triple‐conducting properties of perovskite materials.…”

Section: Proton‐conducting Electrolyte‐based Pcfc Devicesmentioning

confidence: 99%

Progress in proton‐conducting oxides as electrolytes for low‐temperature solid oxide fuel cells: From materials to devices

Zhang

2021

Energy Science & Engineering

136

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Among various types of alternative energy devices, solid oxide fuel cells (SOFCs) operating at low temperatures (300‐600°C) show the advantages for both stationary and mobile electricity production. Proton‐conducting oxides as electrolyte materials play a critical role in the low‐temperature SOFCs (LT‐SOFCs). This review summarizes progress in proton‐conducting solid oxide electrolytes for LT‐SOFCs from materials to devices, with emphases on (1) strategies that have been proposed to tune the structures and properties of proton‐conducting oxides and ceramics, (2) techniques that have been employed for improving the performance of the protonic ceramic‐based SOFCs (known as PCFCs), and (3) challenges and opportunities in the development of proton‐conducting electrolyte‐based PCFCs.

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“…BCZFY was chosen as the cathode in the development of a manufacturing cost model to estimate the production costs of PCFC stack technology using high-volume manufacturing processes [117]. As is the case for double perovskites [105], A-site deficiency in BCFZY increases oxygen deficiency, significantly improving oxygen diffusion and hydration kinetics: an MPD of 0.797 W•cm −2 was achieved at 650 • C for the composition Ba 0.9 Co 0.4 Fe 0.4 Zr 0.1 Y 0.1 O 3−δ [118]. B-site deficiency in BCZFY is also reported to enhance performance with a cell containing a Ba(Co 0.…”

Section: Triple Proton Oxide Ion Electron Hole-conducting Oxidesmentioning

confidence: 99%

Perspectives on Cathodes for Protonic Ceramic Fuel Cells

et al. 2021

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Protonic ceramic fuel cells (PCFCs) are promising electrochemical devices for the efficient and clean conversion of hydrogen and low hydrocarbons into electrical energy. Their intermediate operation temperature (500–800 °C) proffers advantages in terms of greater component compatibility, unnecessity of expensive noble metals for the electrocatalyst, and no dilution of the fuel electrode due to water formation. Nevertheless, the lower operating temperature, in comparison to classic solid oxide fuel cells, places significant demands on the cathode as the reaction kinetics are slower than those related to fuel oxidation in the anode or ion migration in the electrolyte. Cathode design and composition are therefore of crucial importance for the cell performance at low temperature. The different approaches that have been adopted for cathode materials research can be broadly classified into the categories of protonic–electronic conductors, oxide-ionic–electronic conductors, triple-conducting oxides, and composite electrodes composed of oxides from two of the other categories. Here, we review the relatively short history of PCFC cathode research, discussing trends, highlights, and recent progress. Current understanding of reaction mechanisms is also discussed.

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Tuning the defects of the triple conducting oxide BaCo_0.4Fe_0.4Zr_0.1Y_0.1O_3−δ perovskite toward enhanced cathode activity of protonic ceramic fuel cells

Abstract: Ba deficiency is used to tune the electronic, oxygen-ion and proton conduction in BaCo0.4Fe0.4Zr0.1Y0.1O3−δ perovskite for a high-activity cathode of PCFCs.

Cited by 166 publications

References 43 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

Progress in proton‐conducting oxides as electrolytes for low‐temperature solid oxide fuel cells: From materials to devices

Perspectives on Cathodes for Protonic Ceramic Fuel Cells

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