Electrochemical and Photoresponsive Behavior of MOF-Derived V<sub>2</sub>O<sub>3</sub>/C Cathodes for Zinc-Ion Batteries: ZIF-8 as a Nanoscale Reactor and Carbon Source
In this study, a V<sub>2</sub>O<sub>3</sub>/carbon (V<sub>2</sub>O<sub>3</sub>/C) composite was synthesized using zeolitic imidazolate framework 8 (ZIF-8) as both a sacrificial template and in situ carbon source. The composite was prepared by mixing ZI...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-05-01
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| Series: | Crystals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4352/15/5/436 |
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| Summary: | In this study, a V<sub>2</sub>O<sub>3</sub>/carbon (V<sub>2</sub>O<sub>3</sub>/C) composite was synthesized using zeolitic imidazolate framework 8 (ZIF-8) as both a sacrificial template and in situ carbon source. The composite was prepared by mixing ZIF-8 with NH<sub>4</sub>VO<sub>3</sub>, followed by annealing at 800 °C, resulting in nanoscale V<sub>2</sub>O<sub>3</sub> embedded in a nitrogen-doped porous carbon matrix. Fabricated into a thin-film cathode via alternating current electrophoretic deposition (AC-EPD), the composite exhibited mixed capacitive–diffusion-controlled charge storage behavior with favorable Zn<sup>2+</sup> transport kinetics, as confirmed by a <i>b</i>-value analysis (<i>b</i> = 0.72) and diffusion coefficient measurements (<i>D<sub>Zn</sub></i> = 6.2 × 10<sup>−11</sup> cm<sup>2</sup>/s). Notably, the cathode displayed photoresponsive redox behavior under 450 nm illumination, enhancing the Zn-ion kinetics. These findings demonstrate the potential of MOF-derived V<sub>2</sub>O<sub>3</sub>/C composites for high-performance, photo-enhanced zinc-ion energy storage applications. |
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| ISSN: | 2073-4352 |