为双电层电容器量身定制玻璃面条衍生活性炭的宏观/介观/微孔结构

Tailoring Macro/Meso/Microporous Structures of Cellophane Noodle-Derived Activated Carbon for Electric Double-Layer Capacitors.

作者信息

Kim Hyeong-Rae, Jo Myeong-Hun, Ahn Hyo-Jin

机构信息

Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea.

出版信息

Materials (Basel). 2024 Jul 13;17(14):3474. doi: 10.3390/ma17143474.

DOI:10.3390/ma17143474

PMID:39063765

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11277567/

Abstract

To address the bottleneck associated with the slow ion transport kinetics observed in the porosity of activated carbons (ACs), hierarchically structured pore sizes were introduced on ACs used for electric double-layer capacitors (EDLCs) to promote ion transport kinetics under fast-rate charge-discharge conditions. In this study, we synthesized cellophane noodle-derived activated carbon (CNAC) with tailored porous structures, including the pore volume fraction of macro/meso/micropores and the specific surface area. The porous structures were effectively modulated by adjusting the KOH concentration during chemical activation. In addition, optimized KOH activation in CNAC modulated the chemical bonding ratios of C=O, pyrrolic-N, and graphitic-N. Given the hierarchically designed porous structure and chemical bonding states, the CNAC fabricated with optimized KOH activation exhibited a superior ultrafast rate capability in EDLCs (132.0 F/g at 10 A/g).

摘要

为了解决在活性炭（AC）孔隙率中观察到的与缓慢离子传输动力学相关的瓶颈问题，在用于双电层电容器（EDLC）的AC上引入了分级结构的孔径，以促进快速充放电条件下的离子传输动力学。在本研究中，我们合成了具有定制多孔结构的玻璃面条衍生活性炭（CNAC），包括大孔/中孔/微孔的孔体积分数和比表面积。通过在化学活化过程中调整KOH浓度有效地调节了多孔结构。此外，CNAC中优化的KOH活化调节了C=O、吡咯氮和石墨氮的化学键合比率。鉴于分级设计的多孔结构和化学键合状态，经优化KOH活化制备的CNAC在EDLC中表现出优异的超快倍率性能（10 A/g时为132.0 F/g）。