Aloe peel-derived honeycomb-like bio-based carbon with controllable morphology and its superior electrochemical properties for new energy devices |
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Authors: | Ziqi Wang Sining Yun Xiaodong Wang Chen Wang Yiming Si Yangliang Zhang Hongfei Xu |
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Affiliation: | Functional Materials Laboratory (FML), School of Materials & Mineral Resources, Xi''an University of Architecture and Technology, Xi''an, Shaanxi 710055, China |
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Abstract: | In this study, aloe peel-derived honeycomb-like porous carbons (AP-HC) are controllably prepared by combining simple hydrothermal carbonization with chemical activation. A morphology transformation from the spherical structure (AP-SC) to the honeycomb-like structure (AP-HC) is achieved for biomass-derived carbon materials and is accompanied by an increase in the specific surface area from 13 to 1286?m2 g?1. The AP-HC as a counter electrode (CE) for dye-sensitized solar cells (DSSCs) exhibits remarkable catalytic activity for I3- ion reduction and a high power conversion efficiency (PCE) of 6.92% that matches the Pt-based DSSC's performance (7.19%). As a working electrode in supercapacitors (SCs), a high specific capacitance of 264?F?g?1 at 0.5?A?g?1 is achieved in a three-electrode system. Additionally, a high retention rate of ~77.45% (ranging from 0.5 to 30.0?A?g?1) and superior cycling performance (91% capacitance retention after 5000 cycles) are also demonstrated. This study provides an efficient strategy for fabricating morphology-controllable porous bio-based carbon with higher specific surface area (1286?m2 g?1) that exhibits significant potential for new energy devices. |
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Keywords: | Dye-sensitized solar cell Supercapacitor Honeycomb-like porous structure Counter electrode catalyst Bio-based carbon electrode |
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