杂原子
钒
碳纳米管
氧化还原
催化作用
碳纤维
材料科学
吸附
化学工程
兴奋剂
纳米技术
电极
无机化学
化学
有机化学
物理化学
复合材料
光电子学
复合数
工程类
戒指(化学)
作者
Lansong Liu,Xihao Zhang,Denghua Zhang,Kaiyue Zhang,Shaoyu Hou,Shaoliang Wang,Yifan Zhang,Haiquan Peng,Jianguo Liu,Chuanwei Yan
标识
DOI:10.1016/j.cej.2023.145454
摘要
The heteroatom-doped carbon nanotubes hold great promise for improving the properties of carbon felt in vanadium redox flow batteries. However, the structure control and catalytic mechanisms of B, N co-doping are still insufficient. Herein, the precisely controllable B, N co-doped carbon nanotubes (BNCNTs) are constructed on the surface of carbon felt via an in-situ growth method. DFT calculations emphasize the significance of B, N co-doping based on electron transfer promotion and vanadium adsorption enhancement. Subsequently, we regulate the N/B ratio (atomic ratio of N to B) to construct the BNCNTs with a reasonable tubular structure, and the optimal N/B ratio considerably enhances the electrode reaction kinetics. Benefiting from BNCNTs with the optimal N/B ratio, the battery adopting the prepared electrode can deliver an energy efficiency of 79.3% at 300 mA cm−2, and even achieve 68.7% energy efficiency at 500 mA cm−2. Furthermore, the batteries maintain an energy efficiency of around 80% at 300 mA cm−2 during 1000 long-term cycles, which demonstrates remarkable long-term cycle performance. This study reveals the catalytic mechanism of BNCNTs for V2+/V3+ and VO2+/VO2+ redox reactions, which can serve as a fundamental guide for further precise design of heteroatom co-doped carbon nanotubes electrode.
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