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首页> 美国卫生研究院文献>Scientific Reports >Nitrogen-doped Carbon with Modulated Surface Chemistry and Porous Structure by a Stepwise Biomass Activation Process towards Enhanced Electrochemical Lithium-Ion Storage
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Nitrogen-doped Carbon with Modulated Surface Chemistry and Porous Structure by a Stepwise Biomass Activation Process towards Enhanced Electrochemical Lithium-Ion Storage

机译：通过逐步生物质活化过程增强表面锂化学和多孔结构的氮掺杂碳以增强电化学锂离子存储

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Controllable conversion of biomass to value-added carbon materials is attractive towards a wide variety of potential applications. Herein, hydrothermal treatment and KOH activation are successively employed to treat the cheap and abundant camellia oleifera shell as a new carbon raw material. It is shown that this stepwise activation process allows the production of porous nitrogen-doped carbon with optimized surface chemistry and porous structure compared to the counterparts prepared by a single activation procedure. Benefiting from the modulated porous structure, the as-produced porous nitrogen-doped carbon electrode delivered a high reversible capacity of 1080 mAh g−1 at a current density of 100 mA g−1, which is 3.3 and 5.8 times as high as that of the carbon materials prepared by bare hydrothermal treatment or KOH activation, respectively. Moreover, the optimized surface composition of the porous nitrogen-doped carbon endows it with a highest initial Coulombic efficiency among the three samples, showing great potentials for practical applications. This work is expected to pave a new avenue to upgrade biomass to carbon materials with tunable surface properties and microstructures for target applications.
机译：从生物质到增值碳材料的可控转化对多种潜在应用具有吸引力。在此，相继采用水热处理和KOH活化处理廉价和丰富的山茶油壳作为新的碳原料。结果表明，与通过单一活化程序制备的对应物相比，该逐步活化方法可以生产具有优化的表面化学性质和多孔结构的多孔氮掺杂碳。得益于可调节的多孔结构，所制得的多孔氮掺杂碳电极在100 mA g -1 的电流密度下可提供1080 mAh g -1 的高可逆容量。 sup>，分别是通过裸露的水热处理或KOH活化制备的碳材料的3.3倍和5.8倍。此外，在三个样品中，多孔氮掺杂碳的优化表面成分赋予了其最高的库仑效率，显示了巨大的实际应用潜力。这项工作有望为将生物质升级为具有可调整的表面特性和微结构的碳材料提供新的途径，以用于目标应用。

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