Zhu Zhifeng, Chen Ze, Lin Gaojian, Ge Yuanhang, Tu Yingfeng, Chen Hui, Ye Sunjie, Yang Xiaoming
State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science , Soochow University , Suzhou 215123 , P. R. China.
Department of Mechanics Engineering, School of Mechatronical Engineering , Beijing Institute of Technology , Beijing 100081 , China.
ACS Appl Mater Interfaces. 2019 Aug 21;11(33):30116-30124. doi: 10.1021/acsami.9b07412. Epub 2019 Aug 8.
Buckled hollow carbon nanospheres (BHCSs) integrate several attractive properties desired for a variety of potential applications. However, the development of a feasible and simple method for preparing BHCS nanoparticles remains a great challenge. Herein, we present a facile strategy for fabricating monodisperse BHCSs via the compression of intact hollow carbon nanospheres (HCSs) with improved mechanical strength. The essence of our strategy lies in the successful preparation of robust HCSs that can sustain large mechanical deformation during compression, based on the introduction of polyvinylpyrrolidone in the synthesis of HCS templates. Both experiments and finite element analyses are conducted to probe the deformation mechanism of buckling, suggesting that the residual stress introduced by pyrolysis of precursors plays a predominant role in the buckling process. Furthermore, the use of BHCSs as high-performance supercapacitors is demonstrated. Our work provides important insights into the engineering of robust amorphous carbon nanomaterials by the template method and mechanical modulation and provides an innovative synthetic strategy for fabricating asymmetric hollow spheres with potential for a diversity of applications.
屈曲中空碳纳米球（BHCSs）具备多种潜在应用所需的诱人特性。然而，开发一种可行且简便的制备BHCS纳米颗粒的方法仍然是一项巨大挑战。在此，我们提出一种简便策略，通过压缩具有更高机械强度的完整中空碳纳米球（HCSs）来制备单分散的BHCSs。我们策略的核心在于，基于在HCS模板合成过程中引入聚乙烯吡咯烷酮，成功制备出在压缩过程中能承受大机械变形的坚固HCSs。进行了实验和有限元分析以探究屈曲的变形机制，表明前驱体热解引入的残余应力在屈曲过程中起主要作用。此外，还展示了BHCSs作为高性能超级电容器的应用。我们的工作为通过模板法和机械调制来设计坚固的非晶态碳纳米材料提供了重要见解，并为制造具有多种潜在应用的不对称空心球提供了一种创新的合成策略。
