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| Doping heteroatoms to regulate the "mesoporous carbon/electrolyte" interface and enhance energy storage characteristics |
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Received:December 06, 2024
Revised:December 11, 2024
Accepted:December 11, 2024
Published Online:January 21, 2025
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| DOI： |
| KeyWord:Soybean protein;heteroatom doping;mesoporous carbon;supercapacitor; electrode/electrolyte |
| Author | Institution |
| ZHANG Qingwu |
School of Chemistry and Environmental Engineering,China University of Minning and Technology,Beijing |
| LI Jiaxin |
School of Chemistry and Environmental Engineering,China University of Minning and Technology,Beijing |
| LU Hao |
School of Chemistry and Environmental Engineering,China University of Minning and Technology,Beijing |
| ZHAO Zhiyue |
School of Chemistry and Environmental Engineering,China University of Minning and Technology,Beijing |
| SUN Qingwei |
School of Chemistry and Environmental Engineering,China University of Minning and Technology,Beijing |
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| Abstract: |
| It is one of the effective methods to improve the energy density of supercapacitors by doping with multiple heteroatoms on the surface of mesoporous carbon materials. A heteroatom doped mesoporous carbon material was obtained by coagulating soy protein with ferrous sulfate and carbonizing under inert atmosphere. Field emission scanning electron microscope, X-ray photoelectron spectroscopy, X-ray diffraction, and isothermal desorption apparatus were adopted to character morphologies, properties of the surface, patterns and pore structures of the as-prepared material. It shows that this kind of material has a multi-level pore structure, with functional groups containing heteroatoms such as iron, nitrogen, phosphorus, sulfur, and oxygen on the surface. The specific surface area is 276 m2×g-1, the pore size is mainly distributed around 3.7 nm, and the carbon in the material mostly exists in an amorphous state. Among all these doping-heteroatoms, Fe2P is the key element for providing pseudocapacitance to mesoporous carbon. It significantly improves the interfacial compatibility between mesoporous carbon electrode and aqueous electrolyte. The electrochemical specific capacity of the multi-heteroatom-doped electrode material is significantly higher than that of the undoped sample in the 6 mol×L-1 KOH electrolyte and three-electrode system, and its energy storage performance is improved by 150%. |
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