Guan Lijiang, Li Zhi, Wang Kai, Gong Li, Fang Yuanyuan, Yu Guipeng, Zhu Mingshan, Jin Shangbin
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, China.
Guangdong Key Laboratory of Environmental Pollution and Health, College of Environment and Climate, Jinan University, Guangzhou, 511443, China.
Angew Chem Int Ed Engl. 2025 Feb 10;64(7):e202419867. doi: 10.1002/anie.202419867. Epub 2024 Dec 4.
Carbon nanotubes (CNTs) are nanoscale tubular materials with superior mechanical strength and electronic properties. However, the conventional CNTs are inherently non-piezoelectric, mainly due to the lack of polar structures with pure carbon elements. The direct synthesis of fully conjugated and polarized organic nanotubes with desired piezoelectric properties remains a challenge. Herein, we report the bottom-up synthesis of a new type of covalent triazine-based nanotube (CTN-1) as a novel piezoelectric material. The CTN-1 comprises of high surface area, nitrogen-rich and fully conjugated structure, which provides a series of merits for piezoelectric catalytic processes. These structural features combined with one-dimensional tubular morphology endow CTN-1 with excellent mechanical stimuli response and thus displaying prominent piezoelectric properties via pronounced nanocurvature effect. We further show that the CTN-1 enables the efficient synthesis of HO from water in the air via mechanical energy conversion, with an excellent piezocatalytic HO evolution rate of 4115 μmol g h, which exceeds other reported piezoelectric materials. The piezocatalysis by the CTN-1 can be practically integrated into a self-Fenton system, which exhibits excellent pollutant degradation capability. This work demonstrates the enormous potential of a new type of piezoelectric synthetic nanotube from organic frameworks for the in situ synthesis valuable chemicals.
碳纳米管（CNTs）是具有卓越机械强度和电子性能的纳米级管状材料。然而，传统的碳纳米管本质上是非压电的，主要是由于缺乏由纯碳元素构成的极性结构。直接合成具有所需压电性能的完全共轭和极化有机纳米管仍然是一个挑战。在此，我们报告了一种新型共价三嗪基纳米管（CTN-1）的自下而上合成方法，它是一种新型压电材料。CTN-1具有高比表面积、富氮且完全共轭的结构，这为压电催化过程提供了一系列优点。这些结构特征与一维管状形态相结合，赋予CTN-1优异的机械刺激响应能力，从而通过显著的纳米曲率效应展现出突出的压电性能。我们进一步表明，CTN-1能够通过机械能转换在空气中将水高效合成过氧化氢，其压电催化过氧化氢生成速率高达4115 μmol g⁻¹ h⁻¹，超过了其他已报道的压电材料。CTN-1的压电催化作用可实际整合到自芬顿系统中，该系统表现出优异的污染物降解能力。这项工作展示了一种来自有机框架的新型压电合成纳米管在原位合成有价值化学品方面的巨大潜力。
