A highly activated and integrated nanoscale interlayer of cathodes in low-temperature solid oxide fuel cells via precursor-solution electrospray method

Shin, Sung Soo; Kim, Jeong Hun; Li, Guangmin; Lee, Seung Yong; Son, Ji‐Won; Kim, Hyoungchul; Choi, Man-Young

doi:10.1016/j.ijhydene.2018.11.143

Cited by 8 publications

(9 citation statements)

References 54 publications

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“…In FCs, E‐spray can be used for the uniform and controlled deposition of the expensive but required Pt catalyst, porous electrodes, and dense solid electrolytes for PEMFC and SOFC, respectively. [ 122–125 ] In PEMFC devices, 40% of the device cost is attributed to the Pt catalyst. The Toyota Mirai FC vehicle, which was introduced in 2017, used a Pt loading of 0.365 mg cm −2 .…”

Section: E‐spray Deposited Materials For Energy Conversion and Storagmentioning

confidence: 99%

“…Shin et al. [ 123 ] reported the deposition of a nanoparticulate thin film consisting of La 0.6 Sr 0.4 CoO 3− δ (LSC) and LSC–CeO 2 as a nanoscale adhesive layer (nAL) and nanoscale cathode functional layer (nCFL) in between the electrolyte and microscale electrodes, (mCEL), respectively (Figure 13d). As observed in the SEM images and schematics, the coarse morphology of the nAL becomes fine in the nCFL when CeO 2 is added to LSC.…”

Section: E‐spray Deposited Materials For Energy Conversion and Storagmentioning

confidence: 99%

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Electrostatically Sprayed Nanostructured Electrodes for Energy Conversion and Storage Devices

Joshi

Samuel

Kim

et al. 2021

Adv Funct Materials

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The electrostatic spray method is a promising nonvacuum technique for efficient deposition of thin films from solutions or dispersions. The multitude of electrostatic spray process parameters, including surface tension, viscosity, and conductivity of the liquid, applied voltage, nozzle size, and flow rate, make electrostatic spray deposition very versatile for the morphological engineering of nanostructured films. The current state-of-the-art in electrostatic spraying can produce exceptional morphologies. Such tailoring of morphologies is notably useful in electrochemical applications where high electrolyte-accessible surface area often improves performance. Interesting morphologies of metal oxides and their composites are highlighted, including nanopillars, nanoferns, and porous microspheres produced by electrostatic spraying to enhance energy conversion and storage performance. The physics associated with the electrostatic spray process and morphology control using it are also presented. The manuscript highlights the potential of electrospray processing for producing thin films of controlled microstructure, from ultrasmooth layers in organic photovoltaics and perovskite photovoltaics to hierarchical nanostructured films for anodes and photoanodes. It aims to help researchers appreciate essential aspects of electrostatic spray deposition efficiency, process control, and morphology engineering for energy conversion (e.g., solar cell, fuel cell, and photoelectrochemical cell) and energy storage (e.g., lithium-ion battery and supercapacitor) electrodes.

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Section: E‐spray Deposited Materials For Energy Conversion and Storagmentioning

confidence: 99%

Section: E‐spray Deposited Materials For Energy Conversion and Storagmentioning

confidence: 99%

Electrostatically Sprayed Nanostructured Electrodes for Energy Conversion and Storage Devices

Joshi

Samuel

Kim

et al. 2021

Adv Funct Materials

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“…In particular, since the polarization resistance is mainly revealed in the sluggish oxygen reduction reaction (ORR) of the cathode, a reliable structure of cathode is essential. [11][12][13] Electrospray deposition (ESD) process is a technique that can uniformly deposit monodispersed droplets of powder-suspension 14,15 or precursor-solution 16,17 on the substrate by electrostatic and repulsive forces. 18,19 Owing to its wide production range from bulk cathode membrane to thin-film cathode, it has been mainly applied for the fabrication of SOFC cathode.…”

Section: Introductionmentioning

confidence: 99%

“…18,19 Owing to its wide production range from bulk cathode membrane to thin-film cathode, it has been mainly applied for the fabrication of SOFC cathode. [14][15][16][17]20,21 In addition, the ESD process is a versatile and facile method to easily control the cathode morphologies (e.g., porosity, tortuosity, and thickness). 14,22 However, to homogeneously distribute ceramic particles in the bulk cathode membrane, the polymer dispersant should be contained in the slurry of the powder-suspension ESD process.…”

Section: Introductionmentioning

confidence: 99%

Crack‐free cathode of intermediate‐temperature solid oxide fuel cells via electrospray deposition

Kim

Son

et al. 2021

Int J Applied Ceramic Tech

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Cracks and delamination primarily revealed in the microscale‐thick cathode have been known as the major cause of increasing the polarization resistance and inhibiting the low‐temperature operation of solid oxide fuel cells (SOFCs). Besides, these defects were originated from the polymer dispersant, essential for the fabrication of the bulk cathode layer. Herein, we manufactured a crack‐free cathode layer by optimizing the deposition temperature (Tdep) of the powder‐suspension electrospray deposition (ESD) process through thermal characterization of polyvinylpyrrolidone (PVP), a polymer used in the slurry of ESD. SOFCs with the cathode deposited at the glass transition temperature of PVP resulted in a maximum power density of 0.481 W/cm2, 37% and 39% improved than those with the cathode deposited at Tdep = 25 and 200℃, respectively, at 650℃. Furthermore, the effect of uniformly dispersed morphology of cathode without defects was demonstrated by the reduction of polarization resistance through electrochemical impedance spectroscopy analysis.

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“…First, the newly introduced PSE technique enables the uniform loading of precursor solutions over a large area. A typical precursor solution with a high surface tension and low viscosity is not suitable for film deposition by electrostatic spraying. , In this study, a unique PSE with a microsized nozzle (diameter = 8 μm) was applied to achieve a stable cone-jet mode, even in an aqueous precursor solution. Second, the loading and infiltrating steps of the precursor solution in our VMI process are perfectly separated.…”

mentioning

confidence: 99%

Vapor-Mediated Infiltration of Nanocatalysts for Low-Temperature Solid Oxide Fuel Cells Using Electrosprayed Dendrites

et al. 2021

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Electrode architecturing for fast electrochemical reaction is essential for achieving high-performance of low-temperature solid oxide fuel cells (LT-SOFCs). However, the conventional droplet infiltration technique still has limitations in terms of the applicability and scalability of nanocatalyst implementation. Here, we develop a novel two-step precursor infiltration process and fabricate high-performance LT-SOFCs with homogeneous and robust nanocatalysts. This novel infiltration process is designed based on the principle of a reversible sol–gel transition where the gelated precursor dendrites are uniformly deposited onto the electrode via controlled nanoscale electrospraying process then resolubilized and infiltrated into the porous electrode structure through subsequent humidity control. Our infiltration technique reduces the cathodic polarization resistance by 18% compared to conventional processes, thereby achieving an enhanced peak power density of 0.976 W cm–2 at 650 °C. These results, which provide various degrees of freedom for forming nanocatalysts, exhibit an advancement in LT-SOFC technology.

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A highly activated and integrated nanoscale interlayer of cathodes in low-temperature solid oxide fuel cells via precursor-solution electrospray method

Cited by 8 publications

References 54 publications

Electrostatically Sprayed Nanostructured Electrodes for Energy Conversion and Storage Devices

Electrostatically Sprayed Nanostructured Electrodes for Energy Conversion and Storage Devices

Crack‐free cathode of intermediate‐temperature solid oxide fuel cells via electrospray deposition

Vapor-Mediated Infiltration of Nanocatalysts for Low-Temperature Solid Oxide Fuel Cells Using Electrosprayed Dendrites

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