Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, Beijing Advanced Innovation Center for Biomedical Engineering, School of Chemistry , Beihang University , Beijing 100191 , P. R. China.
ACS Appl Mater Interfaces. 2018 Jun 6;10(22):18726-18733. doi: 10.1021/acsami.8b03806. Epub 2018 May 25.
A N,O-codoped hierarchical porous nanocomposite consisting of binary reduced graphene oxide and pyrolytic carbon (rGO/PC) from chitosan is fabricated. The optimized rGO/PC possesses micropores with size distribution concentrated around 1.1 nm and plenty of meso/macropores. The Brunauer-Emmett-Teller specific surface area is 480.8 m g, and it possesses impressively large pore volume of 2.14 cm g. On the basis of the synergistic effects of the following main factors: (i) the confined space effect in the hierarchical porous binary carbonaceous matrix; (ii) the anchor effects by strong chemical bonds with codoped N and O atoms; and (iii) the good flexibility and conductivity of rGO, the rGO/PC/S holding 75 wt % S exhibits high performance as Li-S battery cathode. Specific capacity of 1625 mA h g can be delivered at 0.1 C (1 C = 1675 mA g), whereas 848 mA h g can be maintained after 300 cycles at 1 C. Even at high rate of 5 C, 412 mA h g can be restrained after 1000 cycles.
一种由壳聚糖制备的 N,O 共掺杂分级多孔纳米复合材料，由二元还原氧化石墨烯和热解碳（rGO/PC）组成。优化后的 rGO/PC 具有集中在 1.1nm 左右的微孔分布和大量的中孔/大孔。比表面积为 480.8m2/g，具有令人印象深刻的大孔体积 2.14cm3/g。基于以下主要因素的协同效应：（i）分级多孔二元碳质基质中的受限空间效应；（ii）通过与共掺杂 N 和 O 原子的强化学键的锚固效应；以及（iii）rGO 的良好柔韧性和导电性，负载 75wt%S 的 rGO/PC/S 在 Li-S 电池阴极中表现出优异的性能。在 0.1C（1C=1675mA g）时可提供 1625mA h g 的比容量，而在 1C 时经过 300 次循环后仍可保持 848mA h g。即使在 5C 的高倍率下，经过 1000 次循环后仍可保持 412mA h g。
