Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, USA.
J Am Chem Soc. 2012 Sep 12;134(36):14846-57. doi: 10.1021/ja304352n. Epub 2012 Sep 4.
Novel nanoporous nitrogen-enriched carbon materials were prepared through a simple carbonization procedure of well-defined block copolymer precursors containing the source of carbon, i.e., polyacrylonitrile (PAN), and a sacrificial block, i.e., poly(n-butyl acrylate) (PBA). The preparation of nitrogen-enriched nanocarbons with hierarchical pore structure was enabled by the high fidelity preservation of the initial phase-separated nanostructure between two polymer blocks upon carbonization. Supercapacitors fabricated from the prepared carbons exhibited unusually high capacitance per unit surface area (>30 μF/cm(2)) which was attributed to the pseudocapacitance resulting from the high nitrogen content originating from the PAN precursor. Electrochemical availability of the nitrogen species was also evident from the results of oxygen reduction experiments. The hierarchical pore structure and the high nitrogen content in such materials make them particularly promising for use in supercapacitor and electrocatalyst applications.
通过简单的碳化程序制备了新型的富含氮的纳米多孔碳材料，该碳化程序使用了含有碳源即聚丙烯腈（PAN）和牺牲嵌段即聚（正丁基丙烯酸酯）（PBA）的明确定义的嵌段共聚物前体。通过碳化过程中两个聚合物嵌段之间的初始相分离纳米结构的高保真度保留，实现了具有分级孔结构的富氮纳米碳的制备。由所制备的碳制成的超级电容器表现出异常高的单位表面积比电容（>30 μF/cm2），这归因于源自 PAN 前体的高氮含量引起的赝电容。氧还原实验的结果也表明了氮物种的电化学可用性。这种材料的分级孔结构和高氮含量使它们在超级电容器和电催化剂应用中具有特别高的应用前景。
