电容去离子
杂原子
吸附
碳纤维
硼
兴奋剂
化学工程
材料科学
活性炭
氮气
盐(化学)
无机化学
纳米技术
电化学
化学
电极
有机化学
光电子学
戒指(化学)
复合材料
物理化学
复合数
工程类
作者
Liuqian Yang,Zhen Cao,Dongxu Chen,Zhibing Zhang,Aikelaimu Aihemaiti,Xuerui Gao,Hui Zhu,Jiao Yin
标识
DOI:10.1016/j.cej.2024.151214
摘要
Nitrogen doping is an effective strategy to enhance the salt adsorption capacity (SAC) of carbon electrodes for capacitive deionization (CDI) via generating abundant active adsorption sites. However, the uncontrolled interior doping and the undesired defective sites usually restrict the further enhancement in SAC. Herein, the additional boron element is introduced into the carbon matrix to not only create the porous architectures but also modulate the types of doping species. It is observed that the introduction of B selectively converts the inert graphitic N into active pyrrolic N species with enhanced adsorption capacity in the carbon skeleton. Specifically, the optimized B enriched edge-N defective carbon network (ENC-X) exhibits a high edged N doping content of 85.8 %. Benefitting from the integrative modulation in surface functionalities, the optimized samples demonstrate a significantly higher SAC value of 84.6 mg g−1 in 500 mg L−1 NaCl solution at 1.2 V, comparable to that of the most carbonaceous materials reported so far. Additionally, density functional theory calculations uncover the synergistic effect between B and N doping, further facilitating the capacitive adsorption of sodium ions. Overall, this study highlights the advantages of regulating heteroatom species and co-doping, offering a new perspective for the application of heteroatom-doped carbon in CDI field.
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