Two-step co-sintering method to fabricate anode-supported Ba3Ca1.18Nb1.82O9−δ proton-conducting solid oxide fuel cells

Wang, Siwei; Zhang, Lei; Yang, Zhibin; Zhang, Lingling; Fang, Shumin; Brinkman, Kyle S.; Chen, Fanglin

doi:10.1016/j.jpowsour.2012.05.009

Cited by 21 publications

(10 citation statements)

References 29 publications

(24 reference statements)

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“…Second, Ni shows very high electronic conductivity providing pathways for electron transfer under the operation conditions. Third, Ni shows good chemical compatibility with most of the existing proton-conducting oxides, even at temperatures as high as 1400 1C, 99,131 facilitating the fabrication of proton-conducting SOECs with Ni-based hydrogen electrodes. Finally, proton-conducting SOECs produce only H 2 at the hydrogen electrode side, which makes ambient conditions very mild for both Ni and proton-conducting oxides in the composite electrodes.…”

Section: Hydrogen Electrode Materialsmentioning

confidence: 99%

Steam electrolysis by solid oxide electrolysis cells (SOECs) with proton-conducting oxides

2014

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Energy crisis and environmental problems caused by the conventional combustion of fossil fuels boost the development of renewable and sustainable energies. H2 is regarded as a clean fuel for many applications and it also serves as an energy carrier for many renewable energy sources, such as solar and wind power. Among all the technologies for H2 production, steam electrolysis by solid oxide electrolysis cells (SOECs) has attracted much attention due to its high efficiency and low environmental impact, provided that the needed electrical power is generated from renewable sources. However, the deployment of SOECs based on conventional oxygen-ion conductors is limited by several issues, such as high operating temperature, hydrogen purification from water, and electrode stability. To avoid these problems, proton-conducting oxides are proposed as electrolyte materials for SOECs. This review paper provides a broad overview of the research progresses made for proton-conducting SOECs, summarizing the past work and finding the problems for the development of proton-conducting SOECs, as well as pointing out potential development directions.

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Section: Hydrogen Electrode Materialsmentioning

confidence: 99%

Steam electrolysis by solid oxide electrolysis cells (SOECs) with proton-conducting oxides

2014

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“…2,50 The fuel cells were fabricated by a novel two-step cosintering method as reported elsewhere. 33 Inset in Figure 8 shows the I−V curves and power density of the fuel cell under different temperatures. Maximum power densities of 65, 77, 92, and 102 mW cm −2 with OCV values of 1.04, 1.00, 0.95, and 0.90 V were achieved at 600, 650, 700, and 750 °C, respectively.…”

Section: Electrical Conductivitymentioning

confidence: 99%

Novel Chemically Stable Ba₃Ca_1.18Nb_1.82–xY_xO_9−δ Proton Conductor: Improved Proton Conductivity through Tailored Cation Ordering

et al. 2014

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Simple perovskite-structured proton conductors encounter significant challenges to simultaneously achieving excellent chemical stability and proton conductivity that are desirable for many important applications in energy conversion and storage. This work demonstrates that Y-doped complexperovskite-structured Ba 3 Ca 1.18 Nb 1.82−x Y x O 9−δ materials possess both improved proton conductivity and exceptional chemical stability. Neutron powder diffraction refinement revealed a Fm3̅ m perovskite-structure and increased oxygen vacancy concentration due to the Y doping. High-resolution TEM analysis confirmed the perturbation of the B site cation ordering in the structure for the Ba 3 Ca 1.18 Nb 1.82−x Y x O 9−δ materials. Such combined effects led to improved proton conductivity with a value of 5.3 × 10 −3 S cm −1 at 600 °C for Ba 3 Ca 1.18 Nb 1.52 Y 0.3 O 9−δ (BCNY0.3), a value 2.4 times higher compared with that of the undoped Ba 3 Ca 1.18 Nb 1.82 O 9−δ . The Ba 3 Ca 1.18 Nb 1.82−x Y x O 9−δ materials showed remarkable chemical stability toward water and demonstrated no observable reactions to CO 2 exposure. Ionic transport number studies showed that BCNY0.3 had predominantly proton conduction below 600 °C. Solid oxide fuel cells using BCNY0.3 as an electrolyte demonstrated cell power output of 103 mW cm −2 at 750 °C. These results suggest that a doping strategy that tailors the cation ordering in complex perovskites provides a new direction in the search for novel proton conducting ceramics.

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“…In general, the smaller the grain size, the stronger and denser is the ceramic material, which can contribute to its high thermal stability. 19 Therefore, the traditional solid-state reaction and two-step sintering (TSS) methods were used to obtain pure-phase ceramics with small grain size because there is a temperature range during the TSS, known as the "kinetic window," in which densification can occur without concurrent grain growth. [20][21][22][23] We hope that this work can provide a new perspective on the compositional and structural design of the spinel NTC materials.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the synthesis conditions and sintering method also have a direct influence on the microstructure of the NiMn 2 O 4 ceramics and consequently on the electrical performance of the material. In general, the smaller the grain size, the stronger and denser is the ceramic material, which can contribute to its high thermal stability 19 . Therefore, the traditional solid‐state reaction and two‐step sintering (TSS) methods were used to obtain pure‐phase ceramics with small grain size because there is a temperature range during the TSS, known as the “kinetic window,” in which densification can occur without concurrent grain growth 20‐23 .…”

Section: Introductionmentioning

confidence: 99%

Valence‐induced effects on the electrical properties of NiMn₂O₄ ceramics with different Ni sources

Guan

Milisavljevic

et al. 2021

J Am Ceram Soc

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Spinel-structured NiMn 2 O 4 ceramics, with different valence Ni sources, were originally prepared using Ni 2 O 3 and NiO as raw materials, and the effects of different valence Ni sources on their electrical properties were first investigated. XRD patterns show that both Ni 2 O 3 -based and NiO-based NiMn 2 O 4 ceramics are single cubic spinel structures. SEM/EDS images indicate that the NiMn 2 O 4 ceramics exhibited high density at the experiment-determined sintering temperatures. XPS results and Raman drifts prove that the Ni valence-induced changes in Mn ions at B sites played a significant role in the electrical properties and thermal stability of NiMn 2 O 4 ceramics. Compared with NiO-based NiMn 2 O 4 , the resistivity at 25°C (ρ 25°C ) of Ni 2 O 3 -based NiMn 2 O 4 increased dramatically from 3109 to 106958 Ω cm, the thermal constant (B 25/50 ) increased from 3264 to 4473 K, and the resistance shifts after annealing for 1000 h at 150°C decreased from 0.80% to 0.74%. The investigation of the relationship between the material properties and valence of Ni sources has provided a new and effective way for designing the spinel-structured negative temperature coefficient (NTC) materials by modulating the valence of ions at A sites in the raw materials. K E Y W O R D S electrical properties, Ni 2 O 3 , NiMn 2 O 4 , NiO, solid-state reaction Foundation of China (grant nos'.

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Two-step co-sintering method to fabricate anode-supported Ba3Ca1.18Nb1.82O9−δ proton-conducting solid oxide fuel cells

Cited by 21 publications

References 29 publications

Steam electrolysis by solid oxide electrolysis cells (SOECs) with proton-conducting oxides

Steam electrolysis by solid oxide electrolysis cells (SOECs) with proton-conducting oxides

Novel Chemically Stable Ba₃Ca_1.18Nb_1.82–xY_xO_9−δ Proton Conductor: Improved Proton Conductivity through Tailored Cation Ordering

Valence‐induced effects on the electrical properties of NiMn₂O₄ ceramics with different Ni sources

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Two-step co-sintering method to fabricate anode-supported Ba3Ca1.18Nb1.82O9−δ proton-conducting solid oxide fuel cells

Cited by 21 publications

References 29 publications

Steam electrolysis by solid oxide electrolysis cells (SOECs) with proton-conducting oxides

Steam electrolysis by solid oxide electrolysis cells (SOECs) with proton-conducting oxides

Novel Chemically Stable Ba3Ca1.18Nb1.82–xYxO9−δ Proton Conductor: Improved Proton Conductivity through Tailored Cation Ordering

Valence‐induced effects on the electrical properties of NiMn2O4 ceramics with different Ni sources

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Novel Chemically Stable Ba₃Ca_1.18Nb_1.82–xY_xO_9−δ Proton Conductor: Improved Proton Conductivity through Tailored Cation Ordering

Valence‐induced effects on the electrical properties of NiMn₂O₄ ceramics with different Ni sources