Carbon-based supercapacitors are highly regarded for their high specific power and long cycle life. However, they often face the challenge of low specific energy and difficulty in simultaneously improving both specific energy and specific power. In this study, a high-performance composite electrode was prepared using the cross-section of bamboo as raw material, followed by KOH activation, in-situ growth of ZIF-67, and carbonization. The bamboo-derived porous carbon showed significant improvement in performance indicators such as specific capacitance and energy density. Electrochemical characterization in a three-electrode system showed that at a current density of 1 mA cm −2 , our composite electrode material achieved a peak specific capacitance of 24.7 F cm −2 . When assembled into a symmetric supercapacitor, it can provide an energy density of 1.00 mWh cm −2 at a power density of 2.49 mW cm −2 . Notably, at a substantial current density of 30 mA cm −2 , the electrode maintained a capacitance retention of 96.2 % after 10,000 cycles. These results not only highlight the potential of bamboo-derived porous carbon but also point to a broad avenue for the preparation of energy storage devices by combining MOFs with bamboo.
The reticular chemistry strategy presents a powerful molecule-design tool to tailor the physical and chemical properties of metal-organic framework (MOF). In this work, we for the first time investigated the effect of organic ligands on the radionuclide sequestration (TcO 4 − ) of thorium-organic framework. Through a coordination modulation technique, two novel isoreticular thorium-organic frameworks, namely Th-MOF-67 and Th-MOF-68, were obtained. Relative to the antetype MOF of Th-MOF-66 that shows extremely low uptake of ReO 4 − (a chemical surrogate of radioactive TcO 4 − ), the isoreticular MOFs of Th-MOF-67 and Th-MOF-68 enable ultrahigh uptake of ReO 4 − , giving an impressively 36.8-fold or 56-fold enhancement, respectively. The adsorption capacity of Th-MOF-68 is as high as 560 mg/g, exceeding most reported adsorbents for such use. The mechanism for such exceptional outstanding performance, as unveiled by both the single crystal X-ray diffraction and theoretical calculation, is due to coordination interaction for Th-MOF-67, when a tetrazolate ligand was used, or a combined effect from both coordination interaction and anion-exchange for Th-MOF-68, if using a triazolate ligand.
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