Doping effect of copper ion (Cu2+) on the conductivity behaviour of ceria (Ce1−xCuxO1−δ) electrolyte

Kumar, Kuldeep; Singh, Nitish Kumar; Park, Hae‐Sim

doi:10.1039/c6ra08268h

Cited by 5 publications

(3 citation statements)

References 38 publications

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“…This decrease can be related to the average bond energy which is itself a function of the composition and consequently to the doping content [44,45]. Figure 9 shows the FT-IR spectra of pure and copper doped chromium (III) oxide thin films calcined at 400 ∘ C. It seems clear that the spectra of all samples have the position of the peaks at the same wavenumber confirming no change in the structural bonding upon doping [46]. The absorption bands at wave numbers smaller than 800 cm −1 are related to M-O bands [47], which are the result from the Cr-O stretching modes, which confirms the formation of crystalline chromium (III) oxide [48].…”

Section: B) Optical Propertiesmentioning

confidence: 99%

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Zekaik

Benhebal

Benrabah

2019

High Temperature Materials and Processes

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Cu-doped Cr2O3 thin films were deposited onto glass substrate by the sol–gel dip-coating (SGDC) process using dopant values of 0, 3, 6, 9 and 12%. The Chromium (III) Nitrate Nonahydrate [Cr(NO3)3·9H2O] was used as a Cr source, whilst for the dopant, the corresponding nitrate (Cu(NO3)2) was used. The crystal structure, as well as the optical and electrical properties were examined. XRD data showed that the films with a high degree of crystallinity were rhombohedral Cr2O3 phase. The crystallite size reduces with increase in Cu doping proportion. The AFM results indicate a decrease in the surface roughness of the doped Cr2O3: Cu thin films. The UV-Vis spectra of the Cu doped-Cr2O3 films showed high transparency in the visible region. The optical band gap of Cr2O3 thin films decreases with increasing in Cu doping rate. The Nyquist plot shows that the equivalent circuit of Cu doped-Cr2O3 films is a parallel circuit RpCp. As the concentration of Cu increases, Resistance RP regresses while capacitance Cp increases.

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Section: B) Optical Propertiesmentioning

confidence: 99%

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Zekaik

Benhebal

Benrabah

2019

High Temperature Materials and Processes

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“…This would promote the formation of oxygen vacancies and add electrons in the Ce-sites in accordance with the reaction in Eq. (1) expressed in the Kröger-Vink notation [20]:…”

Section: Sofc Characterization Before and After Electrochemical Measurementsmentioning

confidence: 99%

Mo,Cu-doped CeO2 as Anode Material of Solid Oxide Fuel Cells (SOFCs) using Syngas as Fuel

Díaz-Aburto

Hidalgo

Fuentes-Mendoza

et al. 2021

J. Electrochem. Sci. Technol

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Mo,Cu-doped CeO 2 (CMCuO) nanopowders were synthesized by the nitrate-fuel combustion method aiming to improve the electrical and electrochemical properties of its Mo-doped CeO 2 (CMO) parent by the addition of copper. An electrical conductivity of ca. 1.22•10 -2 S cm -1was measured in air at 800 o C for CMCuO, which is nearly 10 times higher than that reported for CMO. This increase was associated with the inclusion of copper into the crystal lattice of ceria and the presence of Cu and Cu 2 O as secondary phases in the CMCuO structure, which also could explain the increase in the charge transfer activities of the CMCuO based anode for the hydrogen and carbon monoxide electro-oxidation processes compared to the CMO based anode. A maximum power density of ca. 120 mW cm -2 was measured using a CMCuO based anode in a solid oxide fuel cell (SOFC) with YSZ electrolyte and LSM-YSZ cathode operating at 800°C with humidified syngas as fuel, which is comparable to the power output reported for other SOFCs with anodes containing copper. An increase in the area specific resistance of the SOFC was observed after ca. 10 hours of operation under cycling open circuit voltage and polarization conditions, which was attributed to the anode delamination caused by the reduction of the Cu 2 O secondary phase contained in its microstructure. Therefore, the addition of a more electroactive phase for hydrogen oxidation is suggested to confer long-term stability to the CMCuO based anode.

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“…In fact, if a dense electrolyte could be prepared at low temperatures, it could be co-sintered with the electrode components for solid oxide fuel cell applications [5,6]. The reduction of sintering temperature, leading to the reduction of energy consumption, can be achieved by adding metal additives to ceria doped electrolytes during synthesis [7][8][9][10][11][12][13], by synthesizing very reactive powder with ideal morphology as the ones obtained via hydrothermal treatment [14], or by using innovative sintering methods as Flash Sintering [15] or Fast Firing [16]. The first approach can improve both electrochemical and microstructural properties with an effective reduction of sintering temperature [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Morphology and Structural Stability of Bismuth-Gadolinium Co-Doped Ceria Electrolyte Nanopowders

et al. 2019

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The reduction of the sintering temperature of doped ceria ceramics remains an open challenge for their real exploitation as electrolytes for intermediate temperature solid oxide fuel cell (IT-SOFCs) at the industrial level. In this work, we have used Bi (0.5 and 2 mol %) as the sintering aid for Gd (20 mol %)-doped ceria. Nano-sized powders of Bi/Gd co-doped ceria were easily synthesized via a simple and cheap sol-gel combustion synthesis. The obtained powders showed high sinterability and very good electrochemical properties. More importantly, even after prolonged annealing at 700 °C, both of the powders and of the sintered pellets, no trace of structural modifications, phase instabilities, or Bi segregation appeared. Therefore, the use of a small amount of Bi can be taken into account for preparing ceria-based ceramic electrolytes at low sintering temperatures.

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Doping effect of copper ion (Cu²⁺) on the conductivity behaviour of ceria (Ce_1−xCu_xO_1−δ) electrolyte

Abstract: The doping effect of Cu2+ in a ceria matrix has been studied using a microwave assisted synthesis technique.

Cited by 5 publications

References 38 publications

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Mo,Cu-doped CeO2 as Anode Material of Solid Oxide Fuel Cells (SOFCs) using Syngas as Fuel

Morphology and Structural Stability of Bismuth-Gadolinium Co-Doped Ceria Electrolyte Nanopowders

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Doping effect of copper ion (Cu2+) on the conductivity behaviour of ceria (Ce1−xCuxO1−δ) electrolyte

Abstract: The doping effect of Cu2+ in a ceria matrix has been studied using a microwave assisted synthesis technique.

Cited by 5 publications

References 38 publications

Synthesis and characterization of Cu doped chromium oxide (Cr2O3) thin films

Synthesis and characterization of Cu doped chromium oxide (Cr2O3) thin films

Mo,Cu-doped CeO2 as Anode Material of Solid Oxide Fuel Cells (SOFCs) using Syngas as Fuel

Morphology and Structural Stability of Bismuth-Gadolinium Co-Doped Ceria Electrolyte Nanopowders

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Product

Resources

About

Doping effect of copper ion (Cu²⁺) on the conductivity behaviour of ceria (Ce_1−xCu_xO_1−δ) electrolyte

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films