A highly efficient composite cathode for proton-conducting solid oxide fuel cells

Bu, Yunfei; Joo, Sangwook; Zhang, Yanxiang; Wang, Yifan; Meng, Dandan; Ge, Xinlei; Kim, Guntae

doi:10.1016/j.jpowsour.2020.227812

Cited by 64 publications

(44 citation statements)

References 36 publications

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“…[ 34 ] It is also understood that intermediate‐frequency (P2) corresponds to the surface exchange and bulk diffusion and that low‐frequency (P3) indicates gas diffusion (steam and O 2 ). [ 30,35,36 ] The area under a specific peak represents the resistance of the corresponding process. The P3 of SCFN drops sharply after steam is introduced (Figure 3d), implying decreased resistance (P3).…”

Section: Resultsmentioning

confidence: 99%

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Nanocomposites: A New Opportunity for Developing Highly Active and Durable Bifunctional Air Electrodes for Reversible Protonic Ceramic Cells

Song

Liu

Wang

et al. 2021

Advanced Energy Materials

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Reversible protonic ceramic cells (RePCCs) can facilitate the global transition to renewable energy sources by providing high efficiency, scalable, and fuel‐flexible energy generation and storage at the grid level. However, RePCC technology is limited by the lack of durable air electrode materials with high activity toward the oxygen reduction/evolution reaction and water formation/water‐splitting reaction. Herein, a novel nanocomposites concept for developing bifunctional RePCC electrodes with exceptional performance is reported. By harnessing the unique functionalities of nanoscale particles, nanocomposites can produce electrodes that simultaneously optimize reaction activity in both fuel cell/electrolysis operations. In this work, a nanocomposite electrode composed of tetragonal and Ruddlesden–Popper (RP) perovskite phases with a surface enriched by CeO2 and NiO nanoparticles is synthesized. Experiments and calculations identify that the RP phase promotes hydration and proton transfer, while NiO and CeO2 nanoparticles facilitate O2 surface exchange and O2‐ transfer from the surface to the major perovskite. This composite also ensures fast (H+/O2‐/e‐) triple‐conduction, thereby promoting oxygen reduction/evolution reaction activities. The as‐fabricated RePCC achieves an excellent peak power density of 531 mW cm‐2 and an electrolysis current of −364 mA cm‐2 at 1.3 V at 600 °C, while demonstrating exceptional reversible operation stability of 120 h at 550 °C.

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Section: Resultsmentioning

confidence: 99%

“…The P3 of SCFN drops sharply after steam is introduced (Figure 3d), implying decreased resistance (P3). [ 30,36 ] Conversely, the areas under P1 and P2 are relatively unchanged.…”

Section: Resultsmentioning

confidence: 99%

Nanocomposites: A New Opportunity for Developing Highly Active and Durable Bifunctional Air Electrodes for Reversible Protonic Ceramic Cells

Song

Liu

Wang

et al. 2021

Advanced Energy Materials

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“…Since the cathodic performance decisively determines the electrode polarization resistance, the search for high‐performance cathodes that performs well in ILT‐PCFCs has attracted more and more attention. [ 15–20 ]…”

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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“…Highly efficient composite cathodes can also be achieved by mixing MIECs with layered double‐perovskite oxides, for example, PrBaCo 2 O 5+δ (PBC), SmBaCo 2 O 5+δ (SBC), PrBaMn 2 O 5+δ (PBM), PBSCF, and NBSCF due to their considerable proton‐conducting properties 185−188 . For example, single‐perovskite Sm 0.5 Sr 0.5 CoO 3‐δ (SSC) was combined with the layered SBC as a composite cathode for PCFCs, generating 1570 mW cm −2 at 750°C using the BZCYYb electrolyte, with a low area specific resistance (ASR) of 0.021 Ω cm 2 189 . High ORR activity can be achieved by the mixtures due to the triple‐conducting properties of the layered perovskite, which improves the diffusivity of oxide ions and protons simultaneously.…”

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

124

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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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A highly efficient composite cathode for proton-conducting solid oxide fuel cells

Cited by 64 publications

References 36 publications

Nanocomposites: A New Opportunity for Developing Highly Active and Durable Bifunctional Air Electrodes for Reversible Protonic Ceramic Cells

Nanocomposites: A New Opportunity for Developing Highly Active and Durable Bifunctional Air Electrodes for Reversible Protonic Ceramic 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

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