电容去离子
材料科学
海水淡化
电极
化学工程
活性炭
碳纤维
比表面积
电化学
纤维素
吸附
纳米技术
复合材料
膜
化学
复合数
有机化学
物理化学
工程类
催化作用
生物化学
作者
Chunjie Zhang,Dong Wang,Yao Qiu,Qiang Zhang,Zhiyuan Liu,Yanan Liu,Jia Hu,Guangwu Wen
标识
DOI:10.1016/j.cej.2023.144526
摘要
Constructing thick electrodes with both high strength and porous characteristics is challenging but critical to improve the desalination performance of flow-through capacitive deionization (FTCDI). Different from the most reported electrodes composed of carbon nanomaterials, micron-sized carbon fibers are more advantageous due to the innate excellent mechanical stability and macroscopic porous fibrous structure. Herein, we reported the preoxidation-tuned cellulose-derived carbon fibers (POCF) with improved specific surface area, pore volume, hydrophilicity, and carbon defect degree by precisely-controlled preoxidation process, resulting in enhanced electrochemical activity and sites. Further studies of the cellulose pyrolysis mechanism disclose that preoxidation temperature has a crucial influence on the carbon yield and electrical conductivity, which significantly affect the desalination capacity of the integrated (current collector-free and binder-free) POCF electrode. Compared with the conventional activated carbon-coated electrode and commercial activated carbon fibers cloth electrode, the POCF electrode exhibits outstanding desalination performance due to the synergistic effect of high active materials loading and good electrical conductivity. Most importantly, the desalination capacity of POCF electrode realizes the linear growth with 4-fold enhancement by increasing the thickness and remains almost unchanged even up to a large size of 120 cm2, indicating unlimited ion diffusion and excellent scalability. Impressively, an ultrahigh areal salt ion adsorption capacity of 0.76 mg cm−2 is achieved for the 2.4 mm thick POCF electrode. Our work successfully validates the feasibility and superiority of the POCF in constructing thick electrodes for achieving high areal desalination performance.
科研通智能强力驱动
Strongly Powered by AbleSci AI