插层(化学)
介电谱
碱金属
化学
电化学
差示扫描量热法
硒化物
无机化学
结晶学
分析化学(期刊)
材料科学
电极
物理化学
硒
有机化学
物理
热力学
作者
Edyta Pęśko,Artem Lynnyk,Aldona Zalewska,Stanisław Kuś,R. Puźniak,A. Krztoń‐Maziopa
标识
DOI:10.1016/j.jssc.2022.123024
摘要
The electrochemical intercalation of alkali metal – pyridine adducts into iron selenide matrix (FeSe 0.98 ) was performed using galvanostatic conditions in two- and three-electrode setup. The system was examined using electrochemical impedance spectroscopy and analyzed with four-elements equivalent circuit, in which solution and charge transfer resistance, double layer capacitance, and Warburg impedance (diffusion) were identified. Charge transfer resistance was found to rise with increasing reaction time. X-ray powder diffraction analysis revealed elongation of the c axis as a result of intercalation and structural transition from primitive to body-centered unit cell in Na-intercalated system. Scanning electron microscopy with X-ray microanalysis, differential scanning calorimetry, and atomic emission spectroscopy confirmed introduction of guest species. Magnetic susceptibility measurements proved paramagnetic character of studied samples, with occurrence of transition to the superconducting state at around 9 K, similarly to the value observed in pure FeSe 0.98 . • Electrochemical intercalation of alkali metal-pyridine adducts into layered FeSe 1- x . • Electrochemical impedance spectroscopy studies of produced intercalates. • Discussion of structural, compositional, morphology and magnetic properties of synthesized materials.
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