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Robust, Superelastic Hard Carbon with In Situ Ultrafine Crystals

机译：具有原位超细晶体的坚固，超弹性硬碳

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摘要

Advancement in developing superelastic carbon aerogels is highly demanded in new industry sectors, particularly in wearable functional electronics for artificial intelligence applications. However, it is very challenging to increase the compressive strength and electrical conductivity while lowering the density of carbon aerogels. Here, an ultralight and superelastic hard carbon aerogel with in situ ultrafine carbon crystals is reported. Based on a novel precursor prepared from self-assembling bacterial cellulose and thiourea molecules, the resulting aerogel possesses a unique cellular structure and simultaneously exhibits remarkable compressive and electrical properties with ultralow density in addition to excellent compressive cyclability. Specifically, the normalized compression strength and electrical conductivity are up to 20 and 10 times, respectively, of reported carbon aerogels. Armed with the compressed aerogel electrodes, the supercapacitor exhibits excellent electrochemical performance in areal capacitance, rate capability, and high-power cyclic stability. Furthermore, the supercapacitor displays distinguished pressure-response capacitive signal and excellent signal cyclicality. This study provides a unique carbon aerogel for advanced wearable monitoring and energy storage systems.
机译：在新的工业领域，特别是在用于人工智能应用的可穿戴功能电子学中，对开发超弹性碳气凝胶的发展要求很高。然而，增加抗压强度和导电率同时降低碳​​气凝胶的密度是非常具有挑战性的。在此，报道了具有原位超细碳晶体的超轻超弹性硬碳气凝胶。基于从细菌纤维素和硫脲分子自组装制备的新型前驱物，所得气凝胶具有独特的细胞结构，并同时具有出色的压缩和电学性能以及极低的密度，此外还具有出色的压缩循环性。具体而言，归一化的压缩强度和电导率分别是已报道的碳气凝胶的20倍和10倍。配备压缩气凝胶电极，超级电容器在面积电容，速率能力和高功率循环稳定性方面表现出出色的电化学性能。此外，超级电容器可显示出色的压力响应电容信号和出色的信号周期性。这项研究为高级可穿戴监测和能量存储系统提供了独特的碳气凝胶。

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