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

Zhang, Wei; Hu, Yun Hang

doi:10.1002/ese3.886

Cited by 123 publications

(85 citation statements)

References 231 publications

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“…Decades of research have revealed that the best protonic ceramic oxide materials are ABO 3 structured perovskite oxides in which the A-sites are predominantly filled with alkaline earth metals or rare metals with relatively large ionic sizes such as Ca, Sr, Ba, and La, while the B-sites are dominated by smaller sized tetravalent elements such as Zr and Ce. [91][92][93][94] These materials are relatively stable and exhibit a high level of proton conductivity. Ba for instance, has a large ionic size and for this reason, it is an A-site dominant material, whereas Ce and Zr are B-site dominant cations, respectively.…”

Section: Electrolyte Materialsmentioning

confidence: 99%

Materials development and prospective for protonic ceramic fuel cells

Bello

Zhai

et al. 2021

Intl J of Energy Research

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Protonic ceramic fuel cells (PCFCs) are considered a potential and more efficient upgrade to conventional solid oxide fuel cells (SOFCs). This is predominantly due to their capacity to operate efficiently at low and intermediate temperatures and their quality of nonfuel dilution at the anode during operation. This review presents a detailed exposition of the material development strategies for the major components of PCFCs (i.e., electrolyte, cathode, and anode) and how they differ from the traditional SOFCs. Credible science backed recommendations for the synthesis and fabrication of PCFCs materials are discussed. In the end, the opportunities, challenges, and future directions for P-SOFCs are buttressed.

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Section: Electrolyte Materialsmentioning

confidence: 99%

Materials development and prospective for protonic ceramic fuel cells

Bello

Zhai

et al. 2021

Intl J of Energy Research

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“…proton-conducting electrolytes for intermediate temperature (450-700 °C) protonconducting ceramic fuel cells (IT-PCFCs). [1][2][3][4][5][6][7] Fully understanding the proton transport mechanisms is vital for the improvement of proton conductivity. To form protonic defects, BaMO 3 is doped with trivalent elements to create oxygen vacancies.…”

mentioning

confidence: 99%

Optimizing the Proton Conductivity with the Isokinetic Temperature in Perovskite‐Type Proton Conductors According to Meyer–Neldel Rule

Ling

et al. 2021

Advanced Energy Materials

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Perovskite‐type metal oxides such as Y‐doped BaMO3 (M = Zr/Ce) have drawn considerable attention as proton‐conducting electrolytes for intermediate temperature ceramic electrochemical cells. Improving the proton conductivity at lower temperatures requires a comprehensive understanding of the proton conduction mechanism. By applying high pressure or varying the Ce content of Y‐doped BaMO3, it is demonstrated that the proton conductivity follows the Meyer–Neldel rule (MNR) well. In the Arrhenius plot, the conductivities intersect at an isokinetic temperature, where the proton conductivity is independent of activation energy. Considering the relationship between isokinetic temperature and lattice vibration frequency, a high isokinetic temperature is observed in materials with stiff lattices, consisting of light atoms and small MO bond length. Based on consideration of the MNR, it is suggested that the enhancement of proton conductivity at low temperature can be well achieved by tuning lattice vibration frequency toward a desired isokinetic temperature.

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“…Protonic ceramic electrical cells (PCEC) have an increasing research activity and show greater abilities for high performances and reversibility [1][2][3]. The use of high-temperature proton conductors (HTPCs) in such a system decreases the operating temperature in the 400-600 • C range and promotes better durability of the cells [1,2,4].…”

Section: Introductionmentioning

confidence: 99%

X-ray Micro-Computed Tomography: A Powerful Device to Analyze the 3D Microstructure of Anode-Electrolyte in BaZr0.8Y0.2O3 Protonic Ceramic Electrochemical Cells and the Reduction Behavior

Lescure

Gelin²,

François

et al. 2022

Membranes

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New advanced fuel cell technologies are moving towards high-temperature proton conductors (HTPCs) to meet environmental issues. Their elaboration remains a challenge and micro-computed tomography (µCT) is an innovative way to control their quality. NiO-BZY anodic supports of a protonic ceramic electrochemical cell (PCEC), elaborated by co-tape casting and co-sintered at 1350 °C, were coated with a BZY20 electrolyte layer by DC magnetron sputtering. The µCT allowed to observe defects inside the volume of these PCEC half-cells and to show their evolution after an annealing treatment at 1000 °C and reduction under hydrogen. This technique consists in obtaining a 3D reconstruction of all the cross-sectional images of the whole sample, slice by slice. This allows seeing inside the sample at any desired depth. The resolution of 0.35 µm is perfectly adapted to this type of problem considering the thickness of the different layers of the sample and the size of the defects. Defects were detected, and their interpretation was possible thanks to the 3D view, such as the phenomenon of NiO grain enlargement explaining defects in the electrolyte, the effect of NiO reduction, and finally, some anomalies due to the shaping process. Ways to anticipate these defects were then proposed.

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

Cited by 123 publications

References 231 publications

Materials development and prospective for protonic ceramic fuel cells

Materials development and prospective for protonic ceramic fuel cells

Optimizing the Proton Conductivity with the Isokinetic Temperature in Perovskite‐Type Proton Conductors According to Meyer–Neldel Rule

X-ray Micro-Computed Tomography: A Powerful Device to Analyze the 3D Microstructure of Anode-Electrolyte in BaZr0.8Y0.2O3 Protonic Ceramic Electrochemical Cells and the Reduction Behavior

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