Abstract

Nickel/scandia-ceria-stabilized-zirconia (Ni/10Sc1CeSZ) cermet is a potential anode for solid oxide fuel cells. The anode powder is prepared through a microwave-assisted glycine nitrate combustion process, and its properties, including phase and chemical composition as well as morphology, are characterized by XRD, TEM, and EDS techniques. The electrical conductivity and electrochemical behavior under low concentration of dry hydrogen (H₂:N₂ volume ratio = 10:90) and dry methane (CH₄:N₂ volume ratio = 50:50) fuels are determined. XRD results show two phases, namely, cubic NiO phase and cubic 10Sc1CeSZ phase, with the crystallite sizes of 67 and 40 nm, respectively. The area specific resistances (ASRs) of the prepared anode measured using a symmetrical cell of Ni/10Sc1CeSZ|10Sc1CeSZ|Ni/10Sc1CeSZ are 0.96 and 24.3 Ω cm² observed at 800 °C in dry low hydrogen concentration (10 vol% hydrogen–90 vol% nitrogen) and dry methane (50 vol% methane–50 vol% nitrogen) fuels, respectively. The ASR in methane fuel is higher than that in hydrogen fuel at all operating temperatures (600–800 °C) because of carbon deposition. The amount of deposited carbon and degree of graphitization (I_G/I_D) of this anode after exposure in methane at 800 °C for 3 h are 4.34% and 2.1, respectively. Overall, Ni/10Sc1CeSZ cermet synthesized by glycine nitrate process assisted with microwave-heating technique exhibits acceptable electrochemical behavior even at low hydrogen concentration and also in dry methane. This can be related to the improved powder morphology as a result of uniform heating assisted by microwave energy.

Graphical abstract

中文翻译：

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微波加热辅助硝酸甘氨酸法合成的Ni / 10Sc1CeSZ阳极在含氢或甲烷的固体氧化物燃料电池中的性能

摘要

镍/ scan-二氧化铈稳定的氧化锆（Ni / 10Sc1CeSZ）金属陶瓷是固体氧化物燃料电池的潜在阳极。通过微波辅助硝酸甘氨酸硝酸盐燃烧过程制备阳极粉末，并通过XRD，TEM和EDS技术表征其性质，包括相和化学组成以及形态。低浓度的干燥氢气（H ₂：N ₂体积比= 10:90）和干燥甲烷（CH ₄：N ₂）的电导率和电化学行为确定体积比= 50:50）。XRD结果显示出两个相，即立方NiO相和立方10Sc1CeSZ相，其微晶尺寸分别为67和40nm。使用Ni / 10Sc1CeSZ | 10Sc1CeSZ | Ni / 10Sc1CeSZ对称电池测量的制备好的阳极的面积比电阻（ASR）为0.96和24.3Ωcm ²在800°C的干燥低氢浓度（10 vol％氢气–90体积百分比的氮气）和干甲烷（50体积％的甲烷–50体积％的氮气）燃料。在所有工作温度（600–800°C）下，由于碳沉积，甲烷燃料的ASR均高于氢燃料。碳的沉积量和石墨化程度（I _G / I _D在800°C的甲烷中暴露3小时后，该阳极的σ分别为4.34％和2.1。总体而言，由硝酸甘氨酸工艺辅以微波加热技术合成的Ni / 10Sc1CeSZ金属陶瓷即使在低氢浓度和干燥甲烷中也表现出可接受的电化学行为。这可以归因于通过微波能量的均匀加热而改善的粉末形态。