Wang Jing, Yao Yining, Zhang Chaoqi, Sun Qiang, Cheng Dan, Huang Xiaodan, Feng Jiayou, Wan Jingjing, Zou Jin, Liu Chao, Yu Chengzhong
School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, P. R. China.
Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, P. R. China.
Adv Sci (Weinh). 2021 Sep;8(18):e2100120. doi: 10.1002/advs.202100120. Epub 2021 Jul 29.
Rationally designed carbon materials with superstructures are promising candidates in applications such as electrocatalysis. However, the synthesis of highly porous carbon superstructures with macropores and carbon defects from a simple crystalline solid remains challenging. In this work, superstructured macroporous carbon rods composed of defective graphitic nanosheets are synthesized by direct carbonization of crystalline poly tannic acid (PTA) rods as precursors. During carbonization, PTA rods with a highly ordered lamellar structure induce a spatially confined two-step localized contraction that takes place in different dimensions and directions in each step. The unexpected contraction behavior results in the sponge-like macroporous carbon superstructure with large surface area, high porosity, and abundant defects, thus showing a superior electrocatalytic performance with high activity and selectivity for oxygen reduction reaction. The study provides new understandings in the design of functional carbon materials with distinctive structures and applications.
具有超结构的合理设计的碳材料是电催化等应用中很有前景的候选材料。然而，从简单的晶体固体合成具有大孔和碳缺陷的高度多孔碳超结构仍然具有挑战性。在这项工作中，通过将结晶聚单宁酸（PTA）棒作为前驱体直接碳化，合成了由有缺陷的石墨纳米片组成的超结构大孔碳棒。在碳化过程中，具有高度有序层状结构的PTA棒会引发空间受限的两步局部收缩，每一步都在不同的维度和方向上发生。这种意想不到的收缩行为导致了具有大表面积、高孔隙率和丰富缺陷的海绵状大孔碳超结构，从而在氧还原反应中表现出具有高活性和选择性的优异电催化性能。该研究为设计具有独特结构和应用的功能性碳材料提供了新的认识。
