A novel <i>in situ</i> diffusion strategy to fabricate high performance cathodes for low temperature proton-conducting solid oxide fuel cells

Hou, Jie; Miao, Linlin; Hui, Jianing; Bi, Lei; Liu, Wei; Irvine, John T. S.

doi:10.1039/c8ta00859k

Cited by 38 publications

(18 citation statements)

References 44 publications

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“…require a lower activation energy to transport through solid-state crystal structures and associated interfaces due to the small ionic radius and the absence of an electron cloud as compared to other conducting ionic species such as oxygen ions (O 2-) [1]. Due to the combination of performance, efficiency, and stability in the lower temperature range, proton-conducting ceramics (PCCs) have attracted significant interest for applications in energy conversion [2][3][4][5][6][7][8], energy storage [9], electrochemical sensors [10], and advanced gas separations [11][12][13][14][15]. In addition, there has been recent interest in PCCs as enabling technologies in the nuclear industry, including their use as PCCs for tritium sequestration, electrolysis, and separations [16].…”

Section: Introductionmentioning

confidence: 99%

Review: recent progress in low-temperature proton-conducting ceramics

et al. 2019

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Proton-conducting ceramics (PCCs) are of considerable interest for use in energy conversion and storage applications, electrochemical sensors, and separation membranes. PCCs that combine performance, efficiency, stability, and an ability to operate at low temperatures are particularly attractive. This review summarizes the recent progress made in the development of low-temperature protonconducting ceramics (LT-PCCs), which are defined as operating in the temperature range of 25-400°C. The structure of these ceramic materials, the characteristics of proton transport mechanisms, and the potential applications for LT-PCCs will be summarized with an emphasis on protonic conduction occurring at interfaces. Three temperature zones are defined in the LT-PCC operating regime based on the predominant proton transfer mechanism occurring in each zone. The variation in material properties, such as crystal structure, conductivity, microstructure, fabrication methods required to achieve the requisite grain size distribution, along with typical strategies pursued to enhance the proton conduction, is addressed. Finally, a perspective regarding applications of these materials to low-temperature solid oxide fuel cells, hydrogen separation membranes, and emerging areas in the nuclear industry including off-gas capture and isotopic separations is presented.

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Section: Introductionmentioning

confidence: 99%

Review: recent progress in low-temperature proton-conducting ceramics

et al. 2019

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“…SOCs are one of the attractive clean energy technologies due to their potential generation of electricity and storage of renewable energy by operating reversibly in the solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC) modes. ,,,,− For SOFC, it has been deemed as one of the cleanest and most efficient technologies for direct conversion of a wide range of chemical fuels, including H 2 , hydrocarbon, coal gas, and biomass, to electricity at high operating temperatures. ,− When switching to reverse SOEC, it can efficiently convert renewable energies, such as solar energy or wind power, to chemical energy through electrolysis of CO 2 and H 2 O to CO and H 2 , respectively. ,, Conventionally, nickel and yttria stabilized zirconia (Ni-YSZ) composite is used as the fuel electrode. However, it suffers from serious redox instability and coking issues.…”

Section: Enhanced Properties By Features Of Exsolved Metal Npsmentioning

confidence: 99%

In Situ Exsolved Metal Nanoparticles: A Smart Approach for Optimization of Catalysts

2020

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Heterogeneous supported metal nanoparticles (NPs) are extensively applied in a variety of chemical and energy conversion processes. Traditionally, these catalysts are prepared by deposition methods. However, they usually show wide ranging size distributions and are easily subject to poisoning and coarsening or agglomeration during the reactions. Alternatively, the time and costeffective in situ exsolution strategy has successfully addressed the above drawbacks and is able to produce finer and more evenly distributed metal NPs even at relatively low metal loading. Endowed by their socketed nature, the exsolved metal NPs possess excellent operational stabilities as well as great catalytic activities. Moreover, these exsolved metal NPs are smart and can be regenerated upon redox treatments, further extending the lifetime of catalysts. This review presents a general idea in facilitating the degree of exsolution from various oxide substrates by summarizing the recent advances in the exsolution related studies and research outputs with a special emphasis on the understanding of the thermodynamical roles of different experimental parameters.

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“…The choice of proton-blocking cathodes, while rarely pursued, has a rationale as it forces the formation of water to be strictly limited at the interface with the electrolyte, preventing in this way the occupation of reactive ORR sites. On the basis of this consideration, Hou et al prepared a self-assembled composite cathodic material . Mixed SDC-PBCu (Pr(Pr 0.5 Ba 1.5 )Cu 3 O 7−δ ) powders were used to prepare an ink painted on the surface of a dense BCZY electrolyte and fired at 900 °C, resulting in a quaternary proton-blocking composite cathode PDC-BCC-SBCC-CuO (Ce 1– x Pr x O 2−δ -Ba 2 CeCu 3 O 7.4 -Sm 2 Ba 1.33 Ce 0.67 Cu 3 O 9 -CuO); the high diffusivity of Pr toward SDC, and the counter diffusion of Ce and SM into PBCu, were argued to be at the origin of the solid state reaction yielding the final proton-blocking composite.…”

Section: Cathode Interfacesmentioning

confidence: 99%

Solid–Solid Interfaces in Protonic Ceramic Devices: A Critical Review

Chiara

Giannici

Pipitone

et al. 2020

ACS Appl. Mater. Interfaces

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The literature concerning protonic ceramic devices is critically reviewed focusing the reader’s attention on the structure, composition, and phenomena taking place at solid–solid interfaces. These interfaces play a crucial role in the overall device performance, and the relevance of understanding the phenomena taking place at the interfaces for the further improvement of electrochemical protonic ceramic devices is therefore stressed. The grain boundaries and heterostructures in electrolytic membranes, the electrode–electrolyte contacts, and the interfaces within composite anode and cathode materials are all considered, with specific concern to advanced techniques of characterization and to computational modeling by ab initio approaches. An outlook about future developments and improvements highlights the necessity of a deeper insight into the advanced analysis of what happens at the solid–solid interfaces and of in situ/operando investigations that are presently sporadic in the literature on protonic ceramic devices.

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A novel in situ diffusion strategy to fabricate high performance cathodes for low temperature proton-conducting solid oxide fuel cells

Cited by 38 publications

References 44 publications

Review: recent progress in low-temperature proton-conducting ceramics

Review: recent progress in low-temperature proton-conducting ceramics

In Situ Exsolved Metal Nanoparticles: A Smart Approach for Optimization of Catalysts

Solid–Solid Interfaces in Protonic Ceramic Devices: A Critical Review

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