Nikolova Dimitrinka, Gabrovska Margarita, Raikova Gergana, Mladenova Emiliya, Vladikova Daria, Kostov Krassimir L, Karakirova Yordanka
Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Acad. Evgeni Budevski Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Nanomaterials (Basel). 2021 Nov 27;11(12):3224. doi: 10.3390/nano11123224.
Yttrium-doped barium cerate (BCY15) was used as an anode ceramic matrix for synthesis of the Ni-based cermet anode with application in proton-conducting solid oxide fuel cells (pSOFC). The hydrazine wet-chemical synthesis was developed as an alternative low-cost energy-efficient route that promotes 'in situ' introduction of metallic Ni particles in the BCY15 matrix. The focus of this study is a detailed comparative characterization of the nickel state in the Ni/BCY15 cermets obtained in two types of medium, aqueous and anhydrous ethylene glycol environment, performed by a combination of XRD, N physisorption, SEM, EPR, XPS, and electrochemical impedance spectroscopy. Obtained results on the effect of the working medium show that ethylene glycol ensures active Ni cermet preparation with well-dispersed nanoscale metal Ni particles and provides a strong interaction between hydrazine-originating metallic Ni and cerium from the BCY15 matrix. The metallic Ni phase in the pSOFC anode is more stable during reoxidation compared to the Ni cermet prepared by the commercial mechanical mixing procedure. These factors contribute toward improvement of the anode's electrochemical performance in pSOFC, enhanced stability, and a lower degradation rate during operation.
钇掺杂铈酸钡（BCY15）被用作阳极陶瓷基体，用于合成镍基金属陶瓷阳极，应用于质子传导固体氧化物燃料电池（pSOFC）。肼湿化学合成法是一种低成本、高能效的替代路线，可促进金属镍颗粒“原位”引入BCY15基体中。本研究的重点是通过XRD、N物理吸附、SEM、EPR、XPS和电化学阻抗谱等方法，对在水相和无水乙二醇环境这两种介质中获得的Ni/BCY15金属陶瓷中镍的状态进行详细的对比表征。关于工作介质影响的所得结果表明，乙二醇可确保制备出具有良好分散的纳米级金属镍颗粒的活性金属陶瓷，并使肼源金属镍与BCY15基体中的铈之间产生强相互作用。与通过商业机械混合程序制备的镍基金属陶瓷相比，pSOFC阳极中的金属镍相在再氧化过程中更稳定。这些因素有助于改善pSOFC中阳极的电化学性能、提高稳定性并降低运行期间的降解速率。
