Formation of sol–gel derived (Cu,Mn,Co)3O4 spinel and its electrical properties

Mah, Joelle Chia Wen; Muchtar, Andanastuti; Somalu, Mahendra Rao; Ghazali, Mariyam Jameelah; Raharjo, Jarot

doi:10.1016/j.ceramint.2017.03.060

Cited by 24 publications

(8 citation statements)

References 35 publications

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“…It is therefore likely that Fe 3+ replaces Co 2+ at tetragonal sites in the reference spinel and that the increase in lattice constant is due to charge compensation by Co and Mn on the octahedral sites. The results are consistent with those obtained by other investigators [5][6][7][8]. To determine the deviation of the Fe 0.1 Mn 1.45 Co 1.45 O 4 powder obtained via EDTA gel processes after 8 h of calcination in air at 973 K from its nominal composition, its actual composition was determined using XRF.…”

Section: Resultssupporting

confidence: 88%

“…The hopping of small polarons is activated by the presence of cations with different valence states at octahedral sites [6][7][8][9]. In this instance, the addition of Fe into Mn 1.5 Co 1.5 O 4 spinel promotes the formation of Fe 3+ , simultaneously inducing the transition of Mn 2+ /Mn 3+ and Mn 3+ /Mn 4+ at octahedral sites [5][6][7][8][9]. Consequently, the hopping activity in the spinel material decreases and so does electrical conductivity [6].…”

Section: Resultsmentioning

confidence: 99%

“…Its electric conductivity (≈ 0.05 S/cm) is several times higher than that of chromium (≈ 0.01 S/cm). The physicochemical properties of Mn-Co spinel can be improved further using different types of additives, including Y, Cu, and Ni [5][6][7][8][9]. Gavrilov et al [5] obtained Mn-Co-O (MC) and Mn-Co-Y-O (MCYO) layers using coatings deposited via magnetron sputtering on ferritic stainless steel.…”

Section: Introductionmentioning

confidence: 99%

“…Co-doping with both Co and Cu significantly increased conductivityto a level of over 80 S/cm. Using the sol-gel method followed by calcination at 1073 K, Mah et al [7] fabricated (Cu,Mn,Co) 3 O 4 ceramics with an electrical conductivity of over 110 S/cm. The activation energy of electrical conduction measured for this spinel was ca.…”

Section: Introductionmentioning

confidence: 99%

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Structure and Electrical Properties of Fe-Mn-Co-O Spinel

Kruk

Brylewski

2019

Acta Phys. Pol. A

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Sub micro-sized Fe0.1Mn1.45Co1.45O4 powders were obtained using the sol-gel method with EDTA as a complexing agent. The sinters obtained from these powders were characterized by means of scanning electron microscopy, X-ray fluorescence, the Mössbauer spectroscopy, X-ray diffraction, and the 2-probe 4-point direct current method. The X-ray diffraction investigation of the sinter revealed that only the cubic phase had formed. Scanning electron microscopy showed that the sample was dense and exhibited a certain porosity. The addition of iron ions to the Mn1.5Co1.5O4 spinel reduced the electrical conductivity of the obtained sinter from ca. 60 to over 50 S/cm at 973 K. The Mössbauer studies showed the full incorporation of iron into the lattice structure of Mn1.5Co1.5O4. In conclusion, the iron-doped spinel appears to be suitable for the surface modification of ferritic stainless steel substrates used in solid oxide fuel cells interconnects.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure and Electrical Properties of Fe-Mn-Co-O Spinel

Kruk

Brylewski

2019

Acta Phys. Pol. A

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“…There have been several attempts to improve the electrical conductivity and tailor the thermal expansion behavior of the (Mn,Co)3O4 spinels by partially substituting Co with Ti [55], Ni [56], Fe [57,58], Cu [59][60][61][62] or Bi [63]. There is consensus that doping with Cu increases both the electrical conductivity and the thermal expansion coefficient [60][61][62]. It has also been reported that Cu-doping lowers the sintering temperature relative to (Mn,Co)3O4 [56,58,59].…”

Section: Introductionmentioning

confidence: 99%

Thermal expansion and electrical conductivity of Fe and Cu doped MnCo2O4 spinel

et al. 2018

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Manganese cobalt spinel oxides are promising coating materials for corrosion protection of metallic interconnects in solid oxide fuel cell stacks. This work investigates how Fe and Cu doping affect the crystal structure, thermal expansion and electrical conductivity of the MnCo2-xMxO4 (M=Cu, Fe; x = 0.1, 0.3, 0.5) spinel oxides. Single phase cubic spinels were successfully prepared by spray pyrolysis. The electrical conductivity between room temperature and 1000 °C increased with addition of Cu and decreased with addition of Fe. The thermal expansion coefficient (TEC) between 50 and 800 °C decreased from 14.4 to 11.0×10-6 K-1 going from MnCo2O4 to MnCo1.5Fe0.5O4. The TEC of the Cu substituted materials did not follow any obvious trend with composition and was likely influenced by precipitation of CuO during heating. Based on their physical properties, the Fe doped materials are the most attractive for application as SOFC interconnect coatings.

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Optimization of Polarization Resistance of (Cu,Mn)₃O₄ as Cathode Current‐Collecting Layer for Solid Oxide Fuel Cells

Shen

2021

Adv Energy and Sustain Res

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The polarization resistance optimization of the cathode plays a crucial role in reducing the energy consumption of the solid oxide fuel cell (SOFC) stack. Herein, a (Cu,Mn)3O4 spinel material is used for the development of the cathode current‐collecting layer (CCCL) because it has superior price and good electrical conductivity than conventional current‐collecting materials. Symmetrical cells are fabricated using screen printing techniques. It is optimized by studying the influence of sintering temperature, thickness, and adding amount of Co3O4 on the microstructure and polarization resistance of the CCCL. The research found that 850 °C is the most convenient sintering temperature and 1–2 wt% of the adding amount of Co3O4 can optimize the polarization resistance. In addition, it is found that for the cathode side, the total thickness of the CCCL and the cathode should be controlled between 70 and 80 μm, the performance of the cathode is stable, and the polarization resistance is also rationally optimized.

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Formation of sol–gel derived (Cu,Mn,Co)3O4 spinel and its electrical properties

Cited by 24 publications

References 35 publications

Structure and Electrical Properties of Fe-Mn-Co-O Spinel

Structure and Electrical Properties of Fe-Mn-Co-O Spinel

Thermal expansion and electrical conductivity of Fe and Cu doped MnCo2O4 spinel

Optimization of Polarization Resistance of (Cu,Mn)₃O₄ as Cathode Current‐Collecting Layer for Solid Oxide Fuel Cells

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Formation of sol–gel derived (Cu,Mn,Co)3O4 spinel and its electrical properties

Cited by 24 publications

References 35 publications

Structure and Electrical Properties of Fe-Mn-Co-O Spinel

Structure and Electrical Properties of Fe-Mn-Co-O Spinel

Thermal expansion and electrical conductivity of Fe and Cu doped MnCo2O4 spinel

Optimization of Polarization Resistance of (Cu,Mn)3O4 as Cathode Current‐Collecting Layer for Solid Oxide Fuel Cells

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Optimization of Polarization Resistance of (Cu,Mn)₃O₄ as Cathode Current‐Collecting Layer for Solid Oxide Fuel Cells