Pseudocapacitive charge-storage properties of perovskite-based oxides Ca2-xSrxFeCoO6-δ (x = 0, 1)

IF 2.4 3区化学 Q4 CHEMISTRY, PHYSICAL

Chemical Physics Pub Date : 2025-08-22 DOI:10.1016/j.chemphys.2025.112914

Snahasish Bhowmik, Surendra B. Karki, Farshid Ramezanipour

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Abstract

Impact of the ordering of oxygen-vacancies on pseudocapacitive charge-storage properties has been shown through investigation of two oxygen-deficient perovskites Ca₂FeCoO_6-δ (δ = 1) and CaSrFeCoO_6-δ (δ = 0.8). The former is known to comprise an ordered array of oxygen-vacancies leading to tetrahedral chains with alternating orientations. However, in the latter, the tetrahedral chains formed due to vacancy-order do not have the above alternating orientations. The investigation of pseudocapacitive features of the two materials indicate greater charge-storage properties for CaSrFeCoO_6-δ. The contributions of capacitive- and diffusion-control processes were also estimated. In addition, symmetric full cells were fabricated using each material, which showed that the specific capacitance, energy density, and power density of CaSrFeCoO_6-δ are superior to those of Ca₂FeCoO_6-δ and many previously reported pseudocapacitors. Furthermore, CaSrFeCoO_6-δ was found to be highly stable and largely retained its performance upon 10,000 cycles of pseudocapacitive charge-discharge.

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钙钛矿基氧化物Ca2-xSrxFeCoO6-δ (x = 0,1)的赝电容电荷存储性能

通过对两种缺氧钙钛矿Ca2FeCoO6-δ (δ = 1)和CaSrFeCoO6-δ (δ = 0.8)的研究，揭示了氧空位排列对赝电容电荷存储性能的影响。已知前者包含有序的氧空位阵列，导致具有交替取向的四面体链。而在后者中，由于空位序形成的四面体链不具有上述交替取向。对这两种材料的赝电容特性的研究表明，CaSrFeCoO6-δ具有更强的电荷存储性能。对电容控制和扩散控制过程的贡献也进行了估计。结果表明，CaSrFeCoO6-δ的比电容、能量密度和功率密度均优于Ca2FeCoO6-δ和许多先前报道的假电容器。此外，CaSrFeCoO6-δ具有很高的稳定性，并且在10,000次假电容充放电循环中基本保持其性能。

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来源期刊

Chemical Physics 化学-物理：原子、分子和化学物理

CiteScore

4.60

自引率

4.30%

发文量

278

审稿时长

39 days

期刊介绍： Chemical Physics publishes experimental and theoretical papers on all aspects of chemical physics. In this journal, experiments are related to theory, and in turn theoretical papers are related to present or future experiments. Subjects covered include: spectroscopy and molecular structure, interacting systems, relaxation phenomena, biological systems, materials, fundamental problems in molecular reactivity, molecular quantum theory and statistical mechanics. Computational chemistry studies of routine character are not appropriate for this journal.