Strongly coupled Sm 0.2 Ce 0.8 O 2 -Na 2 CO 3 nanocomposite for low temperature solid oxide fuel cells: One-step synthesis and super interfacial proton conduction

Zhang, Guanghong; Li, Wenjian; Huang, Wendeng; Cao, Zhiqun; Shao, Kang; Li, Fengjiao; Tang, Chaoyun; Li, Cuihua; He, Chuanxin; Zhang, Qianling; Fan, Liangdong

doi:10.1016/j.jpowsour.2018.03.035

Cited by 56 publications

(18 citation statements)

References 57 publications

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“…where (

{normalL normala}_{normalC normale}^{^{'}}

‐

{normalL normala}^{3 +}

{normalC normala}_{normalC normale}^{^{'}^{'}}

‐

{normalC normala}^{2 +}

O_{normalO}^{normalX}

‐

{normalO}^{2 -}

and

{normalV}_{O}^{• •}

represent respectively cations in a

{normalC normale}^{4 +}

cation site, ion in an oxygen regular lattice site and doubly positively‐charged oxygen vacancy. However, these two bands are absent in the Raman spectra of the LCDC@KHC composites, which conflicts with what was published in studies that used alkaline carbonate as the second phase in ceria‐carbonate nanocomposite [27,28] . Concerning the vibrations mode of the amorphous bicarbonate phase in the LCDC@KHC nanocomposite specimens, a visible absorption peak appeared around 1047 cm −1 .…”

Section: Resultscontrasting

confidence: 86%

“…The Raman vibration of hydrogencarbonate ions at 1047 cm −1 shifted by 18 cm −1 , compared with the pure crystalline KHCO 3 . Actually, this phenomenon is analogous to that provided in several research works [27,28] and indicates a broad interfacial interaction between LCDC oxide and KHCO 3 bicarbonate, which resulted in the formation of an interfacial layer. The strong interaction at the interface of LCDC/KHCO 3 in LCDC@KHCO 3 nanocomposite led to a new disorderly rearrangement of K, H, C and O atoms in the potassium bicarbonate lattice, which prevented the crystallization of alkaline bicarbonate, as previously confirmed in the XRD patterns for all nanocomposites (see Figure 2).…”

Section: Resultssupporting

confidence: 85%

“…It can be observed, from Figure 5(a), that LCDC shows hierarchical pores. This type of porous network containing a lot of voids was due to the escaping gases (CO 2 , H 2 O…) during combustion process [28,31] . As demonstrated in Figure 5(b), the topography of LCDC@KHC nanocomposite electrolyte powder unveils loosely irregularly‐agglomerated clusters of LCDC particles.…”

Section: Resultsmentioning

confidence: 96%

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New Approach to Improve Ionic Conductivity at Low Temperature by the Decomposition of KHCO₃ in the Nanocomposite Electrolyte @

et al. 2020

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The current work principally treats the significant aspects of solid electrolytes based on cerium oxide in the absence and presence of potassium bicarbonate. The classic oxide electrolyteCe0.7La0.15Ca0.15normalO2-δ (LCDC) and the bicarbonate nanocomposite electrolyteCe0.7La0.15Ca0.15normalO2-δ @KHCO3 (LCDC@KHC) are synthesized separately via self‐combustion and co‐precipitation techniques. Structural, thermal, electro‐morphological and electrochemical properties of pure LCDC and nanocomposite material LCDC@KHC are carefully examined. In particular, the influence of the heavily coupling amongst LCDC oxide and KHCO3 bicarbonate on the microstructures and ionic conductivities of KHCO3‐coated nanocrystalline LCDC is studied by TG/DTA, Raman, FEGSEM and AC impedance spectroscopy. Thermal analyses show that the LCDC@KHC nacomposite is stable at a temperature below 122 °C. Beyond this temperature, the LCDC@KHCO3 nanocomposite is transformed into a LCDC@normalKnormalHnormalCnormalO3/normalK2normalCnormalO3 nanocomposite. XRD data confirms that the LCDC phase and the various nanocomposite materials LCDC@KHC, sintering at different temperatures, adopt the fluorite structure. Lattice parameters and bond lengths are determined by Rietveld refinement. The ionic conductivity of bicarbonate nanocomposite electrolyte LCDC@KHC is 100 to 1000 times higher than that of the novel classic electrolyte LCDC. The remarkable enhancement of conductivity as a function of temperature rise is correlated to the presence of potassium in two forms: bicarbonate and carbonate in the LCDC@normalKnormalHnormalCnormalO3/normalK2normalCnormalO3 nanocomposite electrolyte.

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“…where (

{normalL normala}_{normalC normale}^{^{'}}

‐

{normalL normala}^{3 +}

{normalC normala}_{normalC normale}^{^{'}^{'}}

‐

{normalC normala}^{2 +}

O_{normalO}^{normalX}

‐

{normalO}^{2 -}

and

{normalV}_{O}^{• •}

represent respectively cations in a

{normalC normale}^{4 +}

Section: Resultscontrasting

confidence: 86%

Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 96%

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New Approach to Improve Ionic Conductivity at Low Temperature by the Decomposition of KHCO₃ in the Nanocomposite Electrolyte @

et al. 2020

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“…These composite electrolytes originate from ceria-salt composites [39], with a focus on ceria-carbonate composite systems [5,[40][41][42][43][44][45][46][47][48]. In addition, ceria-carbonate electrolytes have a unique characteristic of hybrid or dual H + and O 2− conduction [5,[48][49][50][51][52][53][54][55][56][57][58][59][60], which was even stable over 6000 h [61]. Figure 4 illustrates these three types of ion conducting electrolyte-based SOFC devices.…”

Section: Electrolyte-based Sofcsmentioning

confidence: 99%

Semiconductor Electrochemistry for Clean Energy Conversion and Storage

Zhu

Fan

Mushtaq

et al. 2021

Electrochem. Energy Rev.

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Semiconductors and the associated methodologies applied to electrochemistry have recently grown as an emerging field in energy materials and technologies. For example, semiconductor membranes and heterostructure fuel cells are new technological trend, which differ from the traditional fuel cell electrochemistry principle employing three basic functional components: anode, electrolyte, and cathode. The electrolyte is key to the device performance by providing an ionic charge flow pathway between the anode and cathode while preventing electron passage. In contrast, semiconductors and derived heterostructures with electron (hole) conducting materials have demonstrated to be much better ionic conductors than the conventional ionic electrolytes. The energy band structure and alignment, band bending and built-in electric field are all important elements in this context to realize the necessary fuel cell functionalities. This review further extends to semiconductor-based electrochemical energy conversion and storage, describing their fundamentals and working principles, with the intention of advancing the understanding of the roles of semiconductors and energy bands in electrochemical devices for energy conversion and storage, as well as applications to meet emerging demands widely involved in energy applications, such as photocatalysis/water splitting devices, batteries and solar cells. This review provides new ideas and new solutions to problems beyond the conventional electrochemistry and presents new interdisciplinary approaches to develop clean energy conversion and storage technologies. Graphic Abstract

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“…In addition, 1200 mW cm −2 was achieved based on hybrid H + /O 2− ion conduction at a lower temperature (490 °C), attracting new research and development activities. Several reviews [4,[15][16][17][18] have tried to explain the superionic conduction in the ceria-carbonate CHC materials based on multi-ionic conduction at interface. However, the superionic conduction phenomena in ceria-carbonate CHC materials are not sufficient to fully understand its behavior.…”

Section: Introductionmentioning

confidence: 99%

Superionic Conductivity in Ceria-Based Heterostructure Composites for Low-Temperature Solid Oxide Fuel Cells

et al. 2020

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• Ceria-based heterostructure composite for novel semiconductor-ionic fuel cells. • Superionic conduction at interfaces is associated with the crossover of band structure. • Band alignment/bending resultant built-in field plays a significant role in superionic conduction. ABSTRACT Ceria-based heterostructure composite (CHC) has become a new stream to develop advanced low-temperature (300-600 °C) solid oxide fuel cells (LTSOFCs) with excellent power outputs at 1000 mW cm −2 level. The state-ofthe-art ceria-carbonate or ceria-semiconductor heterostructure composites have made the CHC systems significantly contribute to both fundamental and applied science researches of LTSOFCs; however, a deep scientific understanding to achieve excellent fuel cell performance and high superionic conduction is still missing, which may hinder its wide application and commercialization. This review aims to establish a new fundamental strategy for superionic conduction of the CHC materials and relevant LTSOFCs. This involves energy band and built-in-field assisting superionic conduction, highlighting coupling effect among the ionic transfer, band structure and alignment impact. Furthermore, theories of ceria-carbonate, e.g., space charge and multi-ion conduction, as well as new scientific understanding are discussed and presented for functional CHC materials.

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Strongly coupled Sm 0.2 Ce 0.8 O 2 -Na 2 CO 3 nanocomposite for low temperature solid oxide fuel cells: One-step synthesis and super interfacial proton conduction

Cited by 56 publications

References 57 publications

New Approach to Improve Ionic Conductivity at Low Temperature by the Decomposition of KHCO₃ in the Nanocomposite Electrolyte @

New Approach to Improve Ionic Conductivity at Low Temperature by the Decomposition of KHCO₃ in the Nanocomposite Electrolyte @

Semiconductor Electrochemistry for Clean Energy Conversion and Storage

Superionic Conductivity in Ceria-Based Heterostructure Composites for Low-Temperature Solid Oxide Fuel Cells

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Strongly coupled Sm 0.2 Ce 0.8 O 2 -Na 2 CO 3 nanocomposite for low temperature solid oxide fuel cells: One-step synthesis and super interfacial proton conduction

Cited by 56 publications

References 57 publications

New Approach to Improve Ionic Conductivity at Low Temperature by the Decomposition of KHCO3 in the Nanocomposite Electrolyte @

New Approach to Improve Ionic Conductivity at Low Temperature by the Decomposition of KHCO3 in the Nanocomposite Electrolyte @

Semiconductor Electrochemistry for Clean Energy Conversion and Storage

Superionic Conductivity in Ceria-Based Heterostructure Composites for Low-Temperature Solid Oxide Fuel Cells

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Product

Resources

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New Approach to Improve Ionic Conductivity at Low Temperature by the Decomposition of KHCO₃ in the Nanocomposite Electrolyte @

New Approach to Improve Ionic Conductivity at Low Temperature by the Decomposition of KHCO₃ in the Nanocomposite Electrolyte @