One-dimensional structured La0.6Sr0.4Co0.2Fe0.8O3−δ - BaCe0.5Zr0.35Y0.15O3−δ composite cathode for protonic ceramic fuel cells

Lee, Sewook; Park, Sang-Ho; Wee, Seokeun; Baek, Hyeon woo; Shin, Dongwook

doi:10.1016/j.ssi.2018.03.010

Cited by 38 publications

(26 citation statements)

References 25 publications

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“…The significantly enhanced cell performance is due to the reduced R p of the LSCF air electrode enabled by the BCO catalyst coating (Figures S15 and S16, Supporting Information). Figure 4d summarizes the P max of the cell with the BCO-LSCF electrode in this study compared with other protonic ceramic fuel cells with LSCF-based air electrodes reported to date [1,[45][46][47][48][49][50] measured at 500-700 °C. Notably, the cell reported in this work shows much higher performance than those achieved so far, demonstrating the remarkable activity of the BCO-LSCF air electrode.…”

Section: High-performance and Durable R-pcecs With The Bco-lscf Air E...mentioning

confidence: 98%

An Efficient Bifunctional Air Electrode for Reversible Protonic Ceramic Electrochemical Cells

Zhou

Zhang

Kane

et al. 2021

Adv Funct Materials

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One of the main bottlenecks that limit the performance of reversible protonic ceramic electrochemical cells (R‐PCECs) is the sluggish kinetics of the oxygen reduction and evolution reactions (ORR and OER). Here, the significantly enhanced ORR and OER kinetics and stability of a conventional La0.6Sr0.4Co0.2Fe0.8O3–δ (LSCF) air electrode by an efficient catalyst coating of barium cobaltite (BCO) is reported. The polarization resistance of a BCO‐coated LSCF air electrode at 600 °C is 0.16 Ω cm2, about 30% of that of the bare LSCF air electrode under the same conditions. Further, an R‐PCEC with the BCO‐coated LSCF air electrode shows exceptional performance in both fuel cell (peak power density of 1.16 W cm−2 at 600 °C) and electrolysis (current density of 1.80 A cm−2 at 600 °C at 1.3 V) modes. The performance enhancement is attributed mainly to the facilitated rate of oxygen surface exchange.

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Section: High-performance and Durable R-pcecs With The Bco-lscf Air E...mentioning

confidence: 98%

An Efficient Bifunctional Air Electrode for Reversible Protonic Ceramic Electrochemical Cells

Zhou

Zhang

Kane

et al. 2021

Adv Funct Materials

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“…For the present case, the average ionic conductivity of BCZD reaches 4.7 and 4.9 mS cm −1 at 600 and 700 °C under condition 1 and 4.9 and 5.4 mS cm −1 , respectively, under condition 2. These belong to a range of the highest values reached for proton-conducting electrolytes (Table 2, [37,52,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79]), which agrees with the independently measured comparison of ionic conductivities of Y- and Dy-doped Ba(Ce,Zr)O 3 [80]. The abovementioned results allow the following important conclusions to be formulated:The BCZD electrolyte forms the basis for the design of novel electrochemical cells with improved output parameters due to its higher ionic conductivity compared with those for the most-studied Y-containing cerate-zirconates;Despite the negative electrochemical response of the electrodes to gas humidification, the average ionic transference and ionic conductivity values take the opposite direction, resulting in improved PCC efficiency.…”

Section: Resultsmentioning

confidence: 99%

A Reversible Protonic Ceramic Cell with Symmetrically Designed Pr2NiO4+δ-Based Electrodes: Fabrication and Electrochemical Features

et al. 2018

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Reversible protonic ceramic cells (rPCCs) combine two different operation regimes, fuel cell and electrolysis cell modes, which allow reversible chemical-to-electrical energy conversion at reduced temperatures with high efficiency and performance. Here we present novel technological and materials science approaches, enabling a rPCC with symmetrical functional electrodes to be prepared using a single sintering step. The response of the cell fabricated on the basis of P–N–BCZD|BCZD|PBN–BCZD (where BCZD = BaCe0.5Zr0.3Dy0.2O3−δ, PBN = Pr1.9Ba0.1NiO4+δ, P = Pr2O3, N = Ni) is studied at different temperatures and water vapor partial pressures (pH2O) by means of volt-ampere measurements, electrochemical impedance spectroscopy and distribution of relaxation times analyses. The obtained results demonstrate that symmetrical electrodes exhibit classical mixed-ionic/electronic conducting behavior with no hydration capability at 750 °C; therefore, increasing the pH2O values in both reducing and oxidizing atmospheres leads to some deterioration of their electrochemical activity. At the same time, the electrolytic properties of the BCZD membrane are improved, positively affecting the rPCC’s efficiency. The electrolysis cell mode of the rPCC is found to be more appropriate than the fuel cell mode under highly humidified atmospheres, since its improved performance is determined by the ohmic resistance, which decreases with pH2O increasing.

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“…For example, nanosized BZCY particles were embedded into the LSCF by electrospinning, forming a one‐dimensional structured fibrous composite (Figure 16). 184 The porous and continuous structure is beneficial for mass transport and charge transfer in the cathode, leading to 239 mW cm −2 at 550°C by a Ni‐BCZY/BCZY/LSCF‐BCZY cell configuration. 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 .…”

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

137

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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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One-dimensional structured La0.6Sr0.4Co0.2Fe0.8O3−δ - BaCe0.5Zr0.35Y0.15O3−δ composite cathode for protonic ceramic fuel cells

Cited by 38 publications

References 25 publications

An Efficient Bifunctional Air Electrode for Reversible Protonic Ceramic Electrochemical Cells

An Efficient Bifunctional Air Electrode for Reversible Protonic Ceramic Electrochemical Cells

A Reversible Protonic Ceramic Cell with Symmetrically Designed Pr2NiO4+δ-Based Electrodes: Fabrication and Electrochemical Features

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

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