Long term testing of BCZY-based protonic ceramic fuel cell PCFC: Micro-generation profile and reversible production of hydrogen and electricity

Dailly, Julian; Ancelin, Marie; Marrony, Mathieu

doi:10.1016/j.ssi.2017.03.002

Cited by 40 publications

(15 citation statements)

References 14 publications

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“…1 O 3−δ -based protonic ceramic cell and found the degradation rate was only 1.2%/kh under fuel cell operation, while increased to 5-8%/kh under fuel cell/electrolysis reversible operation mode. 67 Notably, the ohmic resistance of the PCECs decreased with increasing applied potentials due to the increase in electronic conductivity. [68][69][70] This may result from the ntype electronic conduction at the electrolyte-fuel electrode interface and the p-type electronic conduction at the electrolyte-air electrode interface.…”

Section: Polarization Conditionsmentioning

confidence: 99%

Degradation issues and stabilization strategies of protonic ceramic electrolysis cells for steam electrolysis

2021

Energy Science & Engineering

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Protonic ceramic electrolysis cells (PCECs) are attractive electrochemical devices for converting electrical energy to chemicals due to their high conversion efficiency, favorable thermodynamics, fast kinetics, and inexpensive materials. Compared with conventional oxygen ion‐conducting solid oxide electrolysis cells, PCECs operate at a lower operating temperature and a favorable operation mode, thus expecting high durability. However, the degradation of PCECs is still significant, hampering their development. In this review, the typical degradations of PCECs are summarized, with emphasis on the chemical stability of the electrolytes and the air electrode materials. Moreover, the degradation mechanism and influencing factors are assessed deeply. Finally, the emerging strategies for inhibiting long‐term degradations, including chemical composition modifications and microstructure tuning, are explored.

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Section: Polarization Conditionsmentioning

confidence: 99%

Degradation issues and stabilization strategies of protonic ceramic electrolysis cells for steam electrolysis

2021

Energy Science & Engineering

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“…Before continuing, it is important to describe how these fuel side electrode cermets are fabricated. The most common practice is to co-sinter a thin electrolyte (YSZ or BZCY) onto a composite support composed of NiO and the electrolyte material [32,[407][408][409][410], YSZ on YSZ/NiO for SOFCs, or BZCY on BZCY/NiO in the case of PCFCs. The co-sintering takes place in oxidizing atmospheres at temperatures above 1300 • C, followed by a reduction step to reduce NiO to Ni.…”

Section: Expansion Of Fuel Side Electrodesmentioning

confidence: 99%

Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes

2018

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This review paper focuses on the phenomenon of thermochemical expansion of two specific categories of conducting ceramics: Proton Conducting Ceramics (PCC) and Mixed Ionic-Electronic Conductors (MIEC). The theory of thermal expansion of ceramics is underlined from microscopic to macroscopic points of view while the chemical expansion is explained based on crystallography and defect chemistry. Modelling methods are used to predict the thermochemical expansion of PCCs and MIECs with two examples: hydration of barium zirconate (BaZr1−xYxO3−δ) and oxidation/reduction of La1−xSrxCo0.2Fe0.8O3−δ. While it is unusual for a review paper, we conducted experiments to evaluate the influence of the heating rate in determining expansion coefficients experimentally. This was motivated by the discrepancy of some values in literature. The conclusions are that the heating rate has little to no effect on the obtained values. Models for the expansion coefficients of a composite material are presented and include the effect of porosity. A set of data comprising thermal and chemical expansion coefficients has been gathered from the literature and presented here divided into two groups: protonic electrolytes and mixed ionic-electronic conductors. Finally, the methods of mitigation of the thermal mismatch problem are discussed.

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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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Long term testing of BCZY-based protonic ceramic fuel cell PCFC: Micro-generation profile and reversible production of hydrogen and electricity

Cited by 40 publications

References 14 publications

Degradation issues and stabilization strategies of protonic ceramic electrolysis cells for steam electrolysis

Degradation issues and stabilization strategies of protonic ceramic electrolysis cells for steam electrolysis

Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes

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

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