Fe-Based Coordination Polymers as Battery-Type Electrodes in Semi-Solid-State Battery–Supercapacitor Hybrid Devices

• Published in: ACS applied materials & interfaces Vol. 13; no. 13; pp. 15315 - 15323
• Main Authors: Wang, Kuaibing, Wang, Saier, Liu, Jiadi, Guo, Yuxuan, Mao, Feifei, Wu, Hua, Zhang, Qichun
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 07.04.2021
• Subjects: Energy, Environmental, and Catalysis Applications; FeOOH; Fe-based; battery−supercapacitor-hybrid; MOF; phase transformation
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.1c01339

One two-dimensional Fe-based metal–organic framework (FeSC1) and one one-dimensional coordination polymer (FeSC2) have been solvothermally prepared through the reaction among FeSO4·7H2O, the tripodal ligand 4,4′,4″-s-triazine-2,4,6-triyl-tribenzoate (H3TATB), and flexible secondary building blocks p/m-bis­((1H-imidazole-1-yl)­methyl)­benzene (bib). Given that their abundant interlayer spaces and different coordination modes, two compounds have been employed as battery-type electrodes to understand how void space and different coordination modes affect their performances in three-electrode electrochemical systems. Both materials exhibit outstanding but different electrochemical performances (including distinct capacities and charge-transfer abilities) under three-electrode configurations, where the charge storage for each electrode material is mainly dominated by the diffusion-controlled section (i ∝ v 0.5) through power-law equations. Additionally, the partial phase transformations to more stable FeOOH are also detected in the long-term cycling loops. After coupling with the capacitive carbon-based electrode to assemble into the semi-solid-state battery–supercapacitor-hybrid (sss-BSH) devices, the sss-FeSC1//AC BSH device delivers excellent capacitance, superior energy and power density, and longstanding endurance as well as the potential practical property.