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Coaxial nickel cobalt selenide/nitrogen-doped carbon nanotube array as a three-dimensional self-supported electrode for electrochemical energy storage
RSC Advances ( IF 3.9 ) Pub Date : 2024-03-05 , DOI: 10.1039/d3ra08635f Chen Zhang 1 , Shang Wang 2 , Junwu Xiao 2
RSC Advances ( IF 3.9 ) Pub Date : 2024-03-05 , DOI: 10.1039/d3ra08635f Chen Zhang 1 , Shang Wang 2 , Junwu Xiao 2
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Herein, we propose a one-step urea pyrolysis method for preparing a nitrogen-doped carbon nanotube array grown on carbon fiber paper, which is demonstrated as a three-dimensional scaffold for constructing a nickel cobalt selenide-based coaxial array structure. Thanks to the large surface area, interconnected porous structure, high mass loading, as well as fast electron/ion transport pathway of the coaxial array structure, the nickel cobalt selenide/nitrogen-doped carbon nanotube electrode exhibits over 7 times higher areal capacity than that directly grown on carbon fiber paper, and better rate capability. The cell assembled by a nickel cobalt selenide/nitrogen-doped carbon nanotube positive electrode and an iron oxyhydroxide/nitrogen-doped carbon nanotube negative electrode delivers a volumetric capacity of up to 22.5 C cm−3 (6.2 mA h cm−3) at 4 mA cm−2 and retains around 86% of the initial capacity even after 10 000 cycles at 10 mA cm−2. A volumetric energy density of up to 4.9 mW h cm−3 and a maximum power density of 208.1 mW cm−3 are achieved, and is comparable to, if not better than, those of similar energy storage devices reported previously.
中文翻译：
同轴镍钴硒化物/氮掺杂碳纳米管阵列作为电化学储能三维自支撑电极
在此，我们提出了一种一步尿素热解方法来制备在碳纤维纸上生长的氮掺杂碳纳米管阵列，该阵列被证明可以作为构建镍钴硒基同轴阵列结构的三维支架。由于同轴阵列结构的大表面积、互连多孔结构、高质量负载以及快速电子/离子传输路径，镍钴硒化物/氮掺杂碳纳米管电极的面积容量比传统电极高7倍以上。直接生长在碳纤维纸上，具有更好的倍率性能。由镍钴硒化物/氮掺杂碳纳米管正极和羟基氧化铁/氮掺杂碳纳米管负极组装而成的电池在4℃时的体积容量高达22.5 C cm -3 (6.2 mA h cm -3 )。 mA cm -2 ，即使在 10 mA cm -2下循环 10000 次后仍保留约 86% 的初始容量。体积能量密度高达4.9 mWh cm -3 ，最大功率密度为208.1 mW cm -3 ，与之前报道的类似储能装置相当，甚至更好。
更新日期：2024-03-06
中文翻译：
同轴镍钴硒化物/氮掺杂碳纳米管阵列作为电化学储能三维自支撑电极
在此，我们提出了一种一步尿素热解方法来制备在碳纤维纸上生长的氮掺杂碳纳米管阵列，该阵列被证明可以作为构建镍钴硒基同轴阵列结构的三维支架。由于同轴阵列结构的大表面积、互连多孔结构、高质量负载以及快速电子/离子传输路径，镍钴硒化物/氮掺杂碳纳米管电极的面积容量比传统电极高7倍以上。直接生长在碳纤维纸上，具有更好的倍率性能。由镍钴硒化物/氮掺杂碳纳米管正极和羟基氧化铁/氮掺杂碳纳米管负极组装而成的电池在4℃时的体积容量高达22.5 C cm -3 (6.2 mA h cm -3 )。 mA cm -2 ，即使在 10 mA cm -2下循环 10000 次后仍保留约 86% 的初始容量。体积能量密度高达4.9 mWh cm -3 ，最大功率密度为208.1 mW cm -3 ，与之前报道的类似储能装置相当，甚至更好。
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