Preparation of crab-shell-based N, O co-doped graded porous carbon for supercapacitors using the confined nanospace deposition method

Waste Disposal & Sustainable Energy Pub Date : 2024-04-16 DOI:10.1007/s42768-024-00199-x

Yiming Li, Zhihao Yu, Mengyan Guo, Ming Zhang, Jian Xiong, Yina Qiao, Rui Zhang, Xuebin Lu

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Abstract

Biomass-based carbon materials with hierarchical porous structures have attracted attention for their ability to provide more channels and shorten ion transport paths. Here, we developed a simple method based on confined nanospace deposition. During high-temperature treatment, the mesoporous silica layer wrapped around the outside of the crab shells acted as a closed nanospace and effectively suppressed the severe deformation of the crab shell structure by shrinking inward. The prepared carbon material has a layered porous structure with abundant and stable N and O co-doping (N 7.32%, O 3.69%). The specific capacitance of the three-electrode system was 134.3 F/g at a current density of 0.5 A/g in a 6 mol/L KOH electrolyte, and the assembled aqueous symmetric supercapacitors exhibited an excellent cycling stability of 98.81% even after 5000 cycles.

Graphical abstract

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利用密闭纳米空间沉积法制备用于超级电容器的蟹壳基 N、O 共掺梯度多孔碳

具有分层多孔结构的生物质碳材料能够提供更多通道并缩短离子传输路径，因此备受关注。在此，我们开发了一种基于封闭纳米空间沉积的简单方法。在高温处理过程中，包裹在蟹壳外侧的介孔二氧化硅层起到了封闭纳米空间的作用，有效抑制了蟹壳结构向内收缩的严重变形。所制备的碳材料具有层状多孔结构，具有丰富而稳定的 N 和 O 共掺杂（N 7.32%，O 3.69%）。在 6 mol/L KOH 电解液中，电流密度为 0.5 A/g 时，三电极系统的比电容为 134.3 F/g，组装后的水基对称超级电容器在循环 5000 次后仍具有 98.81% 的优异循环稳定性。

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Waste Disposal & Sustainable Energy

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