Preparation of Ag–Fe2O3-Based black and electrically insulating coatings by magnetron sputtering from metal targets

Tanaka, Satoru; Takamura, Hiroyuki; Yamaguchi, M.; Oikawa, Itaru; Yamazaki, Yusuke; Imura, Masaaki; Takamura, Hitoshi

doi:10.1016/j.vacuum.2023.111839

Cited by 3 publications

(2 citation statements)

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“…Because PLD-derived LSC is often cobalt deficient, a nominally Co-rich La 0.6 Sr 0.44 Co 1.17 O 3−δ target was prepared by ball milling LSC powder with Co 3 O 4 (Wako, >90%) and SrCO 3 (Kojundo, 99.9%) powders, followed by sintering at 1200 °C for 5 h. This target yields thin films with a stoichiometry close to La 0.6 Sr 0.4 CoO 3−δ , as confirmed by inductively coupled plasma mass spectrometry (Table S1). The detailed conditions of this compositional analysis can be found elsewhere . Co 3 O 4 -added LSC–SDC thin films were also prepared by sequential deposition of LSC–SDC for 30 min (corresponding to 133 nm thick), Co 3 O 4 –SDC for 15 min (75 nm), and LSC–SDC for 15 min (67 nm).…”

Section: Methodsmentioning

confidence: 99%

“…The detailed conditions of this compositional analysis can be found elsewhere. 52 Co 3 O 4 -added LSC−SDC thin films were also prepared by sequential deposition of LSC−SDC for 30 min (corresponding to 133 nm thick), Co 3 O 4 −SDC for 15 min (75 nm), and LSC−SDC for 15 min (67 nm). The Co 3 O 4 −SDC target with a nominal volume ratio of 1:1 was prepared in the same manner.…”

Section: Methodsmentioning

confidence: 99%

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Key Role of Interfacial Cobalt Segregation in Stable Low-Resistance Composite Oxygen-Reducing Electrodes

Takamura

Nemoto

Yamaguchi

et al. 2023

ACS Appl. Mater. Interfaces

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The development of efficient and stable oxygen-reducing electrodes is challenging but vital for the production of efficient electrochemical cells. Composite electrodes composed of mixed ionic-electronic conducting La1–x Sr x Co1–y Fe y O3−δ and ionic conducting doped CeO2 are considered promising components for solid oxide fuel cells. However, no consensus has been reached regarding the reasons of the good electrode performance, and inconsistent performance has been reported among various research groups. To mitigate the difficulties related to analyzing composite electrodes, this study applied three-terminal cathodic polarization to dense and nanoscale La0.6Sr0.4CoO3−δ–Ce0.8Sm0.2O1.9 (LSC–SDC) model electrodes. The critical factors determining the performance of the composite electrodes are the segregation of catalytic cobalt oxides to the electrolyte interfaces and the oxide-ion conducting paths provided by SDC. The addition of Co3O4 to the LSC–SDC electrode resulted in reduced LSC decomposition; thus, the interfacial and electrode resistances were low and stable. In the Co3O4-added LSC–SDC electrode under cathodic polarization, Co3O4 turned wurtzite-type CoO, which suggested that the Co3O4 addition suppressed the decomposition of LSC and, thus, the cathodic bias was maintained from the electrode surface to electrode–electrolyte interface. This study shows that cobalt oxide segregation behavior must be considered when discussing the performance of composite electrodes. Furthermore, by controlling the segregation process, microstructure, and phase evolution, stable low-resistance composite oxygen-reducing electrodes can be fabricated.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%