A phase-controlled strategy has been developed to engineer two-dimensional graphene oxide (GO) integrated with a three-dimensional zeolitic imidazolate framework-67 (ZIF-67)/CoCuFe for use as a high-performance anode material in supercapacitors. By employing ZIF-67 as a sacrificial template and introducing transition metals (Co, Cu, and Fe), we successfully fabricated GO/ZIF-67/CoCuFe nanostructures confined between GO layers. Careful control of the calcination steps allowed us to tune the phase composition: while a single-step treatment produced mixed-metal phases, a two-step process enabled the formation of phase-pure CoCuFe embedded within the GO/MOF matrix. This structural confinement, resulting from limited atomic diffusion within the rhombic dodecahedral cavities of ZIF-67 wrapped in GO, proved crucial for achieving optimized electrochemical performance. The resulting composite electrodes exhibited remarkable capacitance, long-term cycling stability, and high Columbic efficiency. Furthermore, we assembled an all-solid-state asymmetric supercapacitor device using our GO/ZIF-67/CoCuFe as the positive electrode and hydrothermally derived GO as the negative electrode, which delivered outstanding energy and power densities alongside stable cycling behavior. These findings underscore the effectiveness of our synthetic approach for designing practical and scalable supercapacitor systems.
Mazaheri et al. (Tue,) studied this question.
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