香港中文大学缪谦团队报道了负弯曲纳米石墨烯的充电及其共价网络。 相关研究成果于2021年3月25日发表在国际顶尖学术期刊《美国化学会杂志》。

该研究探索了一种自下而上的方法从八苯并[8]环烯（一种负弯曲的纳米石墨烯）到负弯曲碳同素异形体的方法。八苯并[8]环烯与碱金属的逐步化学还原反应产生了一种独特的高还原性烃类五阴离子，X射线晶体学揭示了负弯碳同素异形体的还原和碱金属插层过程。

通过镍介导的山本偶联反应聚合八苯并[8]环烯的四溴衍生物，得到了一种新型的多孔富碳材料，该材料由负弯曲纳米石墨烯的共价网络组成。它的比表面积为732 m² g^–1，用作锂离子电池的阳极材料，在100 mA·g^–1的电流密度下，最大容量为830 mAh·g^–1。以上结果表明，该共价网络呈现出负弯曲碳同素异形体的关键结构和功能特征。

附：英文原文

Title: Charging a Negatively Curved Nanographene and Its Covalent Network

Author: Yiqun Zhang, Yikun Zhu, Danni Lan, Sai Ho Pun, Zheng Zhou, Zheng Wei, Ying Wang, Hung Kay Lee, Chao Lin, Jiangpeng Wang, Marina A. Petrukhina, Quan Li, Qian Miao

Issue&Volume: March 25, 2021

Abstract: This study explores a bottom-up approach toward negatively curved carbon allotropes from octabenzo[8]circulene, a negatively curved nanographene. Stepwise chemical reduction reactions of octabenzo[8]circulene with alkali metals lead to a unique highly reduced hydrocarbon pentaanion, which is revealed by X-ray crystallography suggesting a local view for the reduction and alkali metal intercalation processes of negatively curved carbon allotropes. Polymerization of the tetrabromo derivative of octabenzo[8]circulene by the nickel-mediated Yamamoto coupling reaction results in a new type of porous carbon-rich material, which consists of a covalent network of negatively curved nanographenes. It has a specific surface area of 732 m2 g–1 and functions as anode material for lithium ion batteries exhibiting a maximum capacity of 830 mAh·g–1 at a current density of 100 mA·g–1. These results indicate that this covalent network presents the key structural and functional features of negatively curved carbon allotropes.

DOI: 10.1021/jacs.1c01642

Source: https://pubs.acs.org/doi/10.1021/jacs.1c01642