Developing a bifunctional electrode material for efficient energy storage and an effective electrocatalyst for the oxygen evolution reaction (OER) remains of significant scientific interest. Here, the electrochemical properties of perovskite hydroxide CoSn(OH)₆ (CTH) and perovskite oxide CoSnO_3–x (CTO) are systematically evaluated for their applications in asymmetric hybrid supercapacitors (AHSs) and as a catalyst for OER. Dunn analysis is employed to investigate the charge storage mechanism, and electrochemical impedance spectroscopy has been employed to study the charge transfer kinetics and diffusion kinetics associated with both the CTH and CTO electrodes. CTH and CTO exhibit specific capacitances of 1414 and 681 F/g, respectively, revealing that CTH notably manifests superior electrochemical performance. The DFT calculations are performed to elucidate the interaction of OH^– ions with Co and Sn octahedral sites in CTH. Furthermore, the performance of CTH is assessed in a two-electrode system, with CTH acting as the positive electrode and reduced graphene oxide (RGO) as the negative electrode. The constructed CTH//RGO system exhibits an energy density of 83.5 W h/kg and a power density of 461 W/kg, which is a promising performance for energy storage applications. Furthermore, the OER activity was examined, demonstrating CTH’s superior electrocatalytic efficiency, making it an effective bifunctional electrode material for OER and AHS applications.

中文翻译：

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用于高性能不对称混合超级电容器和高效析氧反应的催化 CoSn 钙钛矿：实验研究和 DFT 验证

开发用于高效能量存储的双功能电极材料和用于析氧反应（OER）的有效电催化剂仍然具有重大的科学意义。在此，系统评估了钙钛矿氢氧化物 CoSn(OH) ₆ (CTH) 和钙钛矿氧化物 CoSnO _{3– x} (CTO)的电化学性能，以了解它们在不对称混合超级电容器 (AHS) 中的应用以及作为 OER 催化剂的应用。 Dunn 分析用于研究电荷存储机制，电化学阻抗谱用于研究与 CTH 和 CTO 电极相关的电荷转移动力学和扩散动力学。 CTH和CTO的比电容分别为1414和681 F/g，表明CTH显着表现出优异的电化学性能。进行 DFT 计算是为了阐明 OH ^-离子与 CTH 中 Co 和 Sn 八面体位点的相互作用。此外，CTH 的性能在双电极系统中进行评估，其中 CTH 作为正极，还原氧化石墨烯（RGO）作为负极。构建的CTH//RGO系统表现出83.5 W h/kg的能量密度和461 W/kg的功率密度，这对于储能应用来说是一个有前途的性能。此外，还检查了 OER 活性，证明了 CTH 卓越的电催化效率，使其成为 OER 和 AHS 应用的有效双功能电极材料。