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Effect of Coatings on a Commercial Stainless Steel for SOEC Interconnect Application in Anode Atmosphere

机译:涂层对阳极气氛中SOEC互连应用的商用不锈钢的影响

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The high temperature steam electrolysis (HTE) represents one of the most promising technologies for mass hydrogen production. A commercial K41X steel (AISI441) containing 18 wt.% of chromium was tested as interconnect for solid oxide electrolyser cells (SOEC). In a previous paper, it was shown that the uncoated alloy is not suitable for SOEC interconnect application at 800°C in O_2-H_2O atmosphere. It was also proved that the application of a LaNi_(0.6)Fe_(0.4)O_(3-δ) coating on the surface by physical vapour deposition process improves the alloy electrical behaviour and reduces chromium species evaporation. For this study, the same coating was deposited on the alloy surface by screen-printing process. Moreover, two spinel-type oxides, Co_2MnO_4 and Co_3O_4, deposited by physical vapour deposition process, were also tested in O_2-H_2O atmosphere at 800°C. The electrical conductivity did not present any improvement, but the Cr species volatility was reduced, especially with the LaNi_(0.6)Fe_(0.4)O_(3-δ) coating.
机译:高温蒸汽电解(HTE)代表了最有前途的技术大规模氢气生产中的一个。含铬的18%(重量)商业K41X钢(AISI441)组试验作为互连用于固体氧化物电解电池(SOEC)。在先前的纸,它表明未涂覆的合金是不适合在O_2-H2O气氛中,在800℃下SOEC应用互连。它也证明了LaNi_(0.6)Fe_(0.4)O_(3-δ)通过物理气相沉积过程中的表面上涂覆的应用改善了合金的电特性,并减少铬物质的蒸发。在这项研究中,相同的涂层通过丝网印刷工艺沉积在合金表面上。此外,二尖晶石型氧化物,Co_2MnO_4和Co_3O_4,通过物理气相沉积工艺沉积,也分别在O_2-H2O气氛中,在800℃下测试。电导率没有提出任何改善,但在Cr物种波动降低,特别是与LaNi_(0.6)Fe_(0.4)O_(3-δ)的涂层。

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