Topological Defect Engineering on Carbon Electrode for Advanced Batteries

内容：采用化学气相沉积法成功合成了具有丰富拓扑缺陷和无边缘位置的石墨烯介孔海绵（GMS）。采用x射线衍射、氮吸附-脱附、拉曼光谱和程序升温脱附等方法对GMS的性质进行了表征。使用循环伏安法和充放电测试评估锂氧电池的性能。采用定量和定性两种方法对放电-充电机理进行了研究。重要性：我们首次通过综合表征证实了GMS上大量存在拓扑缺陷。此外，在不考虑边缘位置影响的情况下，估计了Li-O2电池拓扑缺陷的催化效应，这在以往的报道中是没有实现的。

Content: Topological-defect-rich and edge-site-free graphene mesosponge (GMS) was successfully synthesized by chemical vapor deposition. The properties of GMS were characterized by X-ray diffraction, nitrogen adsorption-desorption, Raman spectroscopy, and temperature-programmed desorption. Lithium-oxygen battery performance was evaluated using cyclic voltammetry and discharge-charge tests. The discharge-charge mechanism was investigated by quantitative and qualitative methods. Importance: for the first time, we confirmed the abundant existence of topological defects on GMS through comprehensive characterizations. Moreover, the catalytic effect of topological defects in Li-O2 batteries was estimated without the influence of edge sites, which was not achieved in previous reports.