Deposition of SDC and NiO-SDC thin films and their surface morphology control by electrostatic spray deposition

Taniguchi, Izumi; Hosokawa, T.

doi:10.1016/j.jallcom.2007.05.093

Cited by 11 publications

(10 citation statements)

References 22 publications

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“…using Ru-Ba(NO 3 ) 2 /AC catalysts. Ba(NO 3 ) 2 is generally decomposed to BaO above 550 °C, while Ba(NO 3 ) 2 on Ru/AC is hydrodecomposed to BaO and NH 3 at approximately 200–300 °C. , …”

Section: Resultsmentioning

confidence: 99%

“…A similar phenomenon was reported by Li et al 52 and Truszkiewicz et al 53 using Ru-Ba(NO 3 ) 2 /AC catalysts. Ba(NO 3 ) 2 is generally decomposed to BaO above 550 °C, 54 while Ba(NO 3 ) 2 on Ru/AC is hydrodecomposed to BaO and NH 3 at approximately 200− 300 °C. 52,53 Finally, we studied the effect of Sm addition on the oxidation state and crystallinity of Zr species using CZ-red, CSZ-3-red, CSZ-6-red, and CSZ-10-red.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Sm Doping on CO₂-to-Methanol Hydrogenation of Cu/Amorphous-ZrO₂ Catalysts

et al. 2021

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A series of 14 wt % Cu/Sm2O3/a-ZrO2 (a-: amorphous) catalysts for CO2-to-methanol hydrogenation were prepared by a coimpregnation method. When the Sm loading was 5–6 mol %, the CO2 conversion reached the maximum value (10.1% for 5 mol % catalyst and 9.4% for 6 mol % catalyst). In contrast, methanol selectivity decreased monotonically from 79% to 67% as the Sm loading increased from 0 to 7 mol %. Among the prepared catalysts, the 5–6 mol % Sm-doped Cu/a-ZrO2 catalyst exhibited the highest methanol production rate of 3.7 mmol gcat –1 h–1, which was ca. 20% greater than that with no Sm dopant (3.1 mmol gcat –1 h–1), at 1.0 MPa and 230 °C with a space velocity = 6 L(STP) gcat –1 h–1. When we took into consideration the results of temperature-programmed reduction by H2, X-ray diffraction, and X-ray photoelectron spectroscopy, doping Sm species into Cu/a-ZrO2 increased the number of surface-dispersed Cu2+, resulting in the high dispersion of Cu nanoparticles, as well as an increase in the number of the active sites (interfacial sites between Cu and a-ZrO2). Furthermore, according to the temperature-programmed desorption of CO2, Sm doping promoted CO2 adsorption on the catalysts and simultaneously activated CO2. The negative effect of Sm doping is a drop in methanol selectivity. In other words, it results in an improvement in methanol decomposition to CO. An excess amount of Sm led to Cu sintering. The main active sites (Cu-ZrO2 interface) are expected to be destroyed by sintering the Cu particles, in other words, losing the interaction between Cu and a-ZrO2. Therefore, since the above-mentioned positive effect and negative effect coexist, there is an optimum value for the amount of Sm doping.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effect of Sm Doping on CO₂-to-Methanol Hydrogenation of Cu/Amorphous-ZrO₂ Catalysts

et al. 2021

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“…This implies that the CGO film has negligible gas leakage andprecursor solution concentration, flow rate, deposition temperature, applied electrostatic field and capillary-substrate distance allow easy control of the film morphology and porosity through their adjustment, a complete dense and gastight film is relatively difficult to prepare. To the best of our knowledge, all work relevant to the ESD of doped ceria has concentrated on the examination of film morphology as a consequence of changes in deposition parameters [18][19][20] wherein all films are porous to some degree and no electrochemical measurement was made to evaluate the degree of gas-tightness. In this work, preparation of dense, gas-tight CGO films by ESD is attempted.…”

Section: Introductionmentioning

confidence: 99%

Electrostatic Spray Deposition of Doped Ceria Films

Huang

Chang

Hsu³

et al. 2010

Fuel Cells

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Dense and thin electrolyte films are desirable for solid oxide fuel cells (SOFCs) because of their low gas leakage and low ohmic resistances. This work aims at the preparation of thin dense Gd‐doped ceria (CGO) electrolyte films using a cost‐effective deposition method in ambient atmosphere–electrostatic spray deposition (ESD). The deposition parameters such as deposition temperature, concentration and flow rate of precursor solution were changed systematically to examine their effects on film morphology and hence electrochemical performance. While the film morphology was examined by a scanning electron microscope, the electrochemical performance was revealed by measuring open circuit voltages (OCVs) of NiO‐CGO/CGO/Ba0.5Sr0.5Co0.8Fe0.2O3‐δ (BSCF) cells in 500–700 °C with humidified hydrogen as fuel and air as oxidant. The results show that a CGO film of 25 μm thick obtained at a deposition temperature of 400 °C, a precursor solution flow rate of 6 ml h–1 and a precursor concentration of 0.3 M was dense with very few isolated pores and the OCV of the associated cell was 0.915 V at 500 °C. This implies that the CGO film has negligible gas leakage and ESD is a promising method for preparing thin dense electrolyte films for SOFCs.

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“…Among ceria based solid electrolytes, Ce 0.8 Sm 0.2 O 1.8 (SDC) electrolyte has highest ionic conductivity as well as highest stability against reduction, commonly used for the application in intermediate solid oxide fuel cells (IT-SOFCs) [1][2][3][4][5][6]. The ionic conductors in thin film electrolyte form are of great interest for IT-SOFCs [7][8][9][10] due to ohmic loss of the electrolyte and its performance was found to increase in thin film form [11][12][13]. To reduce the cost of fabrication of SOFCs, formation of thin electrolyte film on electrode substrate is important.…”

Section: Introductionmentioning

confidence: 99%

“…To reduce the cost of fabrication of SOFCs, formation of thin electrolyte film on electrode substrate is important. A suitable anode for SDC based SOFCs is generally suggested to be Ni-SDC ceramic, because of good electrochemical activity to oxidize fuels, high electronic conductivity, proper porosity at the micro-structural level and thermal compatibility with other components of the cell [7,14,15].…”

Section: Introductionmentioning

confidence: 99%

Acetone mediated electrophoretic deposition of nanocrystalline SDC on NiO-SDC ceramics

Bhosale

Joshi

Subhedar

et al. 2010

Journal of Alloys and Compounds

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Deposition of SDC and NiO-SDC thin films and their surface morphology control by electrostatic spray deposition

Cited by 11 publications

References 22 publications

Effect of Sm Doping on CO₂-to-Methanol Hydrogenation of Cu/Amorphous-ZrO₂ Catalysts

Effect of Sm Doping on CO₂-to-Methanol Hydrogenation of Cu/Amorphous-ZrO₂ Catalysts

Electrostatic Spray Deposition of Doped Ceria Films

Acetone mediated electrophoretic deposition of nanocrystalline SDC on NiO-SDC ceramics

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Deposition of SDC and NiO-SDC thin films and their surface morphology control by electrostatic spray deposition

Cited by 11 publications

References 22 publications

Effect of Sm Doping on CO2-to-Methanol Hydrogenation of Cu/Amorphous-ZrO2 Catalysts

Effect of Sm Doping on CO2-to-Methanol Hydrogenation of Cu/Amorphous-ZrO2 Catalysts

Electrostatic Spray Deposition of Doped Ceria Films

Acetone mediated electrophoretic deposition of nanocrystalline SDC on NiO-SDC ceramics

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Product

Resources

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Effect of Sm Doping on CO₂-to-Methanol Hydrogenation of Cu/Amorphous-ZrO₂ Catalysts

Effect of Sm Doping on CO₂-to-Methanol Hydrogenation of Cu/Amorphous-ZrO₂ Catalysts