National Center for Nanoscience and Technology , Beijing 100190, China.
ACS Appl Mater Interfaces. 2015 Jan 28;7(3):1431-8. doi: 10.1021/am5042065. Epub 2015 Jan 15.
Nitrogen-doped graphene has been demonstrated to be an excellent multifunctional material due to its intriguing features such as outstanding electrocatalytic activity, high electrical conductivity, and good chemical stability as well as wettability. However, synthesizing the nitrogen-doped graphene with a high nitrogen content and large specific surface area is still a challenge. In this study, we prepared a nitrogen-doped graphene aerogel (NGA) with high porosity by means of a simple hydrothermal reaction, in which graphene oxide and ammonia are adopted as carbon and nitrogen source, respectively. The microstructure, morphology, porous properties, and chemical composition of NGA were well-disclosed by a variety of characterization methods, such as scanning electron microscopy, nitrogen adsorption-desorption measurements, X-ray photoelectron spectroscopy, and Raman spectroscopy. The as-made NGA displays a large Brunauer-Emmett-Teller specific surface area (830 m(2) g(-1)), high nitrogen content (8.4 atom %), and excellent electrical conductivity and wettability. On the basis of these features, the as-made NGA shows superior capacitive behavior (223 F g(-1) at 0.2 A g(-1)) and long-term cycling performance in 1.0 mol L(-1) H2SO4 electrolyte. Furthermore, the NGA also possesses a high carbon dioxide uptake capacity at 1.0 bar and 273 K (11.3 wt %).
氮掺杂石墨烯由于其独特的性能，如优异的电催化活性、高导电性、良好的化学稳定性和润湿性，已被证明是一种极好的多功能材料。然而，合成具有高氮含量和大比表面积的氮掺杂石墨烯仍然是一个挑战。在本研究中，我们通过简单的水热反应制备了一种具有高孔隙率的氮掺杂石墨烯气凝胶（NGA），其中氧化石墨烯和氨分别作为碳源和氮源。通过多种表征方法，如扫描电子显微镜、氮气吸附-脱附测量、X 射线光电子能谱和拉曼光谱，揭示了 NGA 的微观结构、形貌、多孔性能和化学组成。所制备的 NGA 具有大的 Brunauer-Emmett-Teller 比表面积（830 m(2) g(-1)）、高的氮含量（8.4 原子%）、优异的导电性和润湿性。基于这些特性，所制备的 NGA 在 1.0 mol L(-1) H2SO4 电解质中具有优异的电容性能（在 0.2 A g(-1)时为 223 F g(-1)）和长期循环性能。此外，NGA 在 1.0 巴和 273 K 时还具有高的二氧化碳吸收能力（11.3wt%）。
