Effects of La0.67Sr0.33MnO3 protective coating on SOFC interconnect by plasma-sputtering

Chu, Chun-Lin; Wang, Jian Yih; Lee, Shyong

doi:10.1016/j.ijhydene.2008.02.061

Cited by 75 publications

(29 citation statements)

References 17 publications

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“…These values of ASR satisfy the conventional requirement of 100 mΩ cm 2 for metallic interconnect materials [1]. MnCo 2 O 4 coating improves the electrical property, which is better than other coatings reported by other researchers [12,14,19,23]. The ASR of the Co/LaCoO 3 coated AISI 430 alloy is 20 mΩ cm 2 after pre-oxidation of 600 h at 800°C in air [14], and the ASR of the Mn 50 Co 50 coated ZMG 232 L alloy is 59 mΩ cm 2 only after pre-oxidation of 601 h at 800°C in air [23].…”

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confidence: 76%

The electrical property of MnCo2O4 and its application for SUS 430 metallic interconnect

Hua

Kong

et al. 2010

Chin. Sci. Bull.

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The conductivity of MnCo 2 O 4 spinel, the best route to form the MnCo 2 O 4 protective coating applied by the sol-gel process, and its effect on the intermediate temperature oxidation behavior of SUS 430 alloy, a typical material for the interconnect of solid oxide fuel cell (SOFC), was investigated. The phase structure and surface morphology of the coating and surface oxides were characterized by XRD, SEM and EDS; the "4-probe" method was employed to determine the conductivity of MnCo 2 O 4 spinel and the area specific resistance (ASR) of the surface oxides. The conductivity of MnCo 2 O 4 spinel is excellent, which is 2 orders of magnitude better than that of MnCr 2 O 4 spinel. Long-term thermally cyclic oxidation at 750°C in SOFC cathode atmosphere and ASR measurement have shown that calcined in reducing atmosphere followed by pre-oxidation in the air is the best technique for forming the MnCo 2 O 4 protective coating, which enhances the oxidation resistance, and improves the electrical conductivity and adherence of coated SUS 430 alloy significantly. As a result, the MnCo 2 O 4 spinel is the most potential candidate for SOFC metallic interconnect protective coating application. solid oxide fuel cell, MnCo 2 O 4 , oxidation kinetics, area specific resistance Citation: Hua B, Kong Y H, Lu F S, et al. The electrical property of MnCo 2 O 4 and its application for SUS 430 metallic interconnect.The interconnect is a critical component of the planar solid oxide fuel cell (SOFC) stack that provides electrical connections between adjacent cells, physically separates the oxidant and fuel gases, and distributes the gases to electrodes. Because of the relatively high operation temperature (1000°C), the requirements for interconnect materials are quite stringent. The conventional ceramic interconnect material mainly is LaCrO 3 perovskite with Sr or Ca doping, which is difficult to fabrication and has a high cost. With the recent progress in materials, fabrication and design of SOFC, the SOFC operation temperature reduces from near 1000°C to an intermediate temperature range of about 600−800°C. It allows the use of metallic alloys as interconnect materials with advantages in electric and thermal conductivities, mechanical *Corresponding author (email: plumarrow@126.com) integrity, fabrication and cost [1]. Among all metallic materials, Cr 2 O 3 -forming ferritic stainless steels are one type of the most promising interconnect material candidates and have been intensively investigated due to their attractive coefficient of thermal expansion (CTE) compatibility and excellent oxidation resistance [2−8]. However, the oxidation of Fe-Cr alloys (such as SUS 430, Crofer 22 APU, ZMG 232, E-Brite) is inevitable during SOFC operation. The thermally grown oxide scales (mainly consisted of Cr 2 O 3 and Mn-Cr spinel) of the ferritic stainless steels may overgrow to as thick as tens of micrometers during SOFC's lifetime, resulting in high electrical resistance and even scale spallation, and subsequently degraded the stack performance dr...

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confidence: 76%

The electrical property of MnCo2O4 and its application for SUS 430 metallic interconnect

Hua

Kong

et al. 2010

Chin. Sci. Bull.

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“…It shows fairly good performance in oxidation rate, electrical conductivity and Cr evaporation in the SOFC operating condition. The Crofer22 has been approved as a promising SOFC interconnect metal by many researchers for the last several years [8,9]. However, its material cost is still very high since it has to be fabricated by vacuum melting process due to the alloying with rare earth metal and very low Si content near 0.01 mass% [10].…”

Section: Introductionmentioning

confidence: 99%

Development of a new cost effective Fe–Cr ferritic stainless steel for SOFC interconnect

Kim

et al. 2015

International Journal of Hydrogen Energy

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“…Perovskite materials (such as LSM and LSCF), which are also used as SOFC cathode, were extensively investigated for this application due to their high electrical conductivity and compatible thermal expansion behavior [12][13][14][15]. Recently, (Mn,Co) 3 O 4 spinel was reported by some researchers to have some excellent performance.…”

Section: Introductionmentioning

confidence: 99%

Cu doped Mn–Co spinel protective coating on ferritic stainless steels for SOFC interconnect applications

Xu,

Wen,

Wang

et al. 2011

Solid State Ionics

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Effects of La0.67Sr0.33MnO3 protective coating on SOFC interconnect by plasma-sputtering

Cited by 75 publications

References 17 publications

The electrical property of MnCo2O4 and its application for SUS 430 metallic interconnect

The electrical property of MnCo2O4 and its application for SUS 430 metallic interconnect

Development of a new cost effective Fe–Cr ferritic stainless steel for SOFC interconnect

Cu doped Mn–Co spinel protective coating on ferritic stainless steels for SOFC interconnect applications

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