College of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University , Number 5268 Renmin Street, Changchun 130024, China.
Department of Chemistry, University of Toronto , 80 Saint George Street, Toronto, ON M5S 3H6, Canada.
ACS Appl Mater Interfaces. 2017 Dec 13;9(49):42699-42707. doi: 10.1021/acsami.7b12776. Epub 2017 Nov 28.
A novel kind of biomass-derived, high-oxygen-containing carbon material doped with nitrogen that has willow-leaf-shaped pores was synthesized. The obtained carbon material has an exotic hierarchical pore structure composed of bowl-shaped macropores, willow-leaf-shaped pores, and an abundance of micropores. This unique hierarchical porous structure provides an effective combination of high current densities and high capacitance because of a pseudocapacitive component that is afforded by the introduction of nitrogen and oxygen dopants. Our synthetic optimization allows further improvements in the performance of this hierarchical porous carbon (HPC) material by providing a high degree of control over the graphitization degree, specific surface area, and pore volume. As a result, a large specific surface area (1093 m g) and pore volume (0.8379 cm g) are obtained for HPC-650, which affords fast ion transport because of its short ion-diffusion pathways. HPC-650 exhibits a high specific capacitance of 312 F g at 1 A g, retaining 76.5% of its capacitance at 20 A g. Moreover, it delivers an energy density of 50.2 W h kg at a power density of 1.19 kW kg, which is sufficient to power a yellow-light-emitting diode and operate a commercial scientific calculator.
合成了一种新型的生物质衍生的、高含氧含氮的碳材料，具有柳叶状的孔。所得到的碳材料具有奇特的分级孔结构，由碗状的大孔、柳叶状的孔和丰富的微孔组成。这种独特的分级多孔结构提供了高电流密度和高电容的有效结合，这是由于引入氮和氧掺杂剂提供的赝电容分量。我们的合成优化允许通过对石墨化程度、比表面积和孔体积进行高度控制，进一步提高这种分级多孔碳（HPC）材料的性能。结果，HPC-650 获得了高比表面积（1093 m g）和孔体积（0.8379 cm g），由于其短的离子扩散途径，提供了快速的离子传输。HPC-650 在 1 A g 时表现出 312 F g 的高比电容，在 20 A g 时保留其电容的 76.5%。此外，它在 1.19 kW kg 的功率密度下提供 50.2 W h kg 的能量密度，足以为黄色发光二极管供电并操作商业科学计算器。
