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One-step molten salt carbonization (MSC) of firwood biomass for capacitive carbon

机译：木材生物质的一步法熔融盐碳化（MSC）用于电容性碳

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摘要

Capacitive carbons are prepared by a molten salt carbonization (MSC) process from Chinese firwood biomass, and the effect of the biomass size (lengths ranging from 0.09 to 2 cm) on the carbon yield and the electrochemical capacitive performance of the carbonized samples is investigated. The mechanism of carbon treatment and structure-activity correlations are discussed. Compared with carbon prepared without the assistance of MS, MSC-derived carbon prepared from the same precursor size (i.e. 0.09 cm) shows a higher specific capacitance (189 vs. 165 F g(-1) at 0.2 A g(-1)) and enhanced high-rate capability (85% vs. 70% capacitance retention upon increasing the charge-discharge current density from 0.2 to 2.0 A g(-1)). Upon decreasing the precursor size from 2.0 to 0.09 cm, the specific capacitance increases from 142 to 189 F g(-1), with the high-rate capacitance retention increasing from 70% to 85%. These improvements highlight the merits of the MSC method and engineering the precursor sizes for the preparation and modification of enhanced capacitive carbon, which is promising for practical applications. It is also found that the production yield of the MSC method decreases upon decreasing the precursor size. Therefore, the precursor size should be prudently tailored to ensure a balance between the capacitive properties and production yield.
机译：电容碳是通过熔融盐碳化（MSC）工艺从杉木木材生物质中制备的，研究了生物质尺寸（长度在0.09至2 cm之间）对碳化样品的碳收率和电化学电容性能的影响。讨论了碳处理的机理和构效关系。与不用MS辅助制备的碳相比，由相同前体尺寸（即0.09 cm）制备的MSC衍生的碳显示出更高的比电容（189 vs. 0.25 F g（-1）在0.2 A g（-1）时）以及更高的高倍率能力（将充放电电流密度从0.2 A g（-1）增加到85％与70％时的电容保持率）。将前驱体尺寸从2.0 cm减小到0.09 cm后，比电容从142 F g（-1）增加到189 F g（-1），高速率电容保持率从70％增加到85％。这些改进突出了MSC方法的优点，并设计了用于制备和修饰增强型电容碳的前驱体尺寸，这对于实际应用是有前途的。还发现，随着前驱体尺寸的减小，MSC方法的产率降低。因此，应谨慎地调整前驱体的尺寸，以确保电容性能和生产良率之间达到平衡。

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