Li Lin, Li Yitong, Ye Yu, Guo Ruiting, Wang Anni, Zou Guoqiang, Hou Hongshuai, Ji Xiaobo
State Key Laboratory of Powder Metallurgy, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
School of Materials Science and Engineering, Zhengzhou University, Henan 450001, China.
ACS Nano. 2021 Apr 27;15(4):6872-6885. doi: 10.1021/acsnano.0c10624. Epub 2021 Mar 16.
Carbon dot is a type of carbon material with an ultrasmall size of less than 10 nm for all three dimensions, which has attracted more and more attention due to its useful merits. Unfortunately, the complicated synthesis method and low yield largely limit its wide large-scale application. Herein, an inexpensive and high-efficiency aldol condensation method under ambient temperature and pressure was proposed for the large-scale synthesis of CDs, which can obtain products with 1.083 kg in 2 h and realize the functionalization of carbon dots doped with nitrogen (NCDs) and sulfur/nitrogen doubly (NSCDs), and then the mechanism and structure of CDs formation were explained. Moreover, utilizing the feature of controllable assembly of carbon dots, and combined with theoretical calculations, we have designed functionalized 1D carbon fibers (CF) to construct high-performance potassium storage anode materials through the assembly of carbon dots induced by a Zn compound. Benefitting from the microstructure and surface functional groups derived from CDs, the N-doped CF (NCF700) exhibits superior electrochemical energy storage performance for potassium ion batteries (PIBs). This study provides a low-cost and high-yield method to produce CDs and promotes the practical application of CDs in electrochemical energy storage.
碳点是一种三维尺寸均小于10 nm的超小尺寸碳材料，因其诸多有用特性而受到越来越多的关注。不幸的是，复杂的合成方法和低产率在很大程度上限制了其大规模广泛应用。在此，提出了一种在常温常压下的廉价高效羟醛缩合方法用于大规模合成碳点，该方法在2小时内可获得1.083 kg产物，并实现了氮掺杂碳点（NCDs）和硫/氮双掺杂碳点（NSCDs）的功能化，进而解释了碳点形成的机理和结构。此外，利用碳点可控组装的特性，并结合理论计算，我们设计了功能化的一维碳纤维（CF），通过锌化合物诱导的碳点组装来构建高性能钾存储负极材料。受益于源自碳点的微观结构和表面官能团，氮掺杂碳纤维（NCF700）对钾离子电池（PIBs）表现出优异的电化学储能性能。本研究提供了一种低成本、高产率的碳点制备方法，并促进了碳点在电化学储能中的实际应用。
