State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute at Sichuan University, Chengdu 610065, China; Advanced Polymer Materials Research Center of Sichuan University, Shishi 362700, China.
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute at Sichuan University, Chengdu 610065, China.
Carbohydr Polym. 2020 Oct 1;245:116554. doi: 10.1016/j.carbpol.2020.116554. Epub 2020 Jun 6.
Nanocellulose-derived carbon is a promising material in energy storage because of its sustainability, low environmental impact, and large specific surface area. Herein, the skin secretion of Andrias davidianus (SSAD) is applied for the first time as the bio-nitrogen source to dope carbon aerogels from nanocellulose. Cellulose nanocrystal (CNC) is discovered to be very effective to address the dispersion problem of SSAD in water. After being homogeneously mixed with cellulose nanofiber (CNF), honeycomb-structured nanofibrous carbon aerogels are obtained via unidirectional freeze-drying of the SSAD/CNC/CNF mixture followed by high-temperature carbonization. Impressively, unlike those fragile carbon aerogels in many early works, the present ones exhibit outstanding elasticity in repeated compression and release tests. Moreover, a symmetric binder-free supercapacitor is assembled from the carbon aerogels, which exhibits improved electrochemical capacitive properties and cycling stability. And even after 500 compression and release cycles, the supercapacitor can still maintain high capacitive performance, indicating its superiorities in durability and electrochemical stability.
纳米纤维素衍生的碳因其可持续性、低环境影响和大的比表面积而成为储能领域很有前途的材料。在此，首次将大鲵皮肤分泌物（SSAD）用作生物氮源，从纳米纤维素中掺杂碳气凝胶。发现纤维素纳米晶体（CNC）非常有效地解决了 SSAD 在水中的分散问题。将 SSAD/CNC/CNF 混合物与纤维素纳米纤维（CNF）均匀混合后，通过单向冷冻干燥，再经过高温碳化，得到具有蜂窝状结构的纳米纤维碳气凝胶。令人印象深刻的是，与许多早期工作中那些易碎的碳气凝胶不同，目前的气凝胶在反复压缩和释放测试中表现出优异的弹性。此外，由碳气凝胶组装而成的对称无粘结剂超级电容器，表现出改进的电化学电容性能和循环稳定性。即使经过 500 次压缩和释放循环，超级电容器仍能保持高电容性能，表明其在耐久性和电化学稳定性方面具有优越性。
