Maximizing utilization of carbon fibers by bimetallic-catalytic etching and electrochemical modification for difunctional aqueous supercapacitors,Sustainable Energy & Fuels

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Maximizing utilization of carbon fibers by bimetallic-catalytic etching and electrochemical modification for difunctional aqueous supercapacitors
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2021-07-22 , DOI: 10.1039/d1se00773d
Jie Zhang _{1,

2,

3,

4,

5} , Hao Zhang _{1,

2,

3,

4,

5} , Wenli Li _{1,

2,

3,

4,

5} , Guangwen Xu _{1,

2,

3,

4,

5} , Yanbin Cui _{1,

2,

3,

4,

5}

Affiliation

Carbon fiber cloth with high utilization is urgently needed for portable and wearable electronics. We report herein an interconnected 3D primitive outer layer by utilizing two disparate catalytic etching behaviors based on a bimetallic layered double hydroxide precursor. After subsequent electro-modification, the resulting carbon cloth textile was directly applied as a free-standing electrode. The comprehensive strategy not only furnishes carbon fiber textiles with a loosely graphitic outer layer and hierarchical porosity, but also enables the efficient incorporation of oxygen functionalities onto the surface while retaining high mechanical strength and conductivity. The optimal electrode exhibits superhydrophilicity and delivers an impressive areal capacitance of 1089 mF cm⁻² and a widened potential of −1.3–0 V. Upon further coupling with onion-like MnO₂/carbon cloth and Zn foil, an asymmetric device with enhanced energy density (7.17 mW h cm⁻³) and a novel hybrid Zn-ion supercapacitor with a long cycling life are assembled, respectively. This synthetic strategy provides new insights into the etching of carbonaceous materials and may open up enormous possibilities for the pretreatment of carbon substrates.

中文翻译：

通过双金属催化蚀刻和电化学改性对双功能水性超级电容器最大限度地利用碳纤维

便携式和可穿戴电子产品迫切需要高利用率的碳纤维布。我们在本文中通过利用基于双金属层状双氢氧化物前体的两种不同的催化蚀刻行为报告了互连的 3D 原始外层。在随后的电改性后，将所得碳布织物直接用作独立电极。该综合策略不仅为碳纤维纺织品提供了松散的石墨外层和分级孔隙率，而且还能够将氧官能团有效地结合到表面，同时保持高机械强度和导电性。最佳电极表现出超亲水性，并提供令人印象深刻的 1089 mF cm ^-2面积电容和-1.3-0 V的加宽电位。进一步与洋葱状MnO ₂ /碳布和锌箔耦合后，具有增强的能量密度（7.17 mW h cm ^-3）的非对称器件和新型混合锌离子超级电容器分别组装了具有长循环寿命的部件。这种合成策略为碳质材料的蚀刻提供了新的见解，并可能为碳基材的预处理开辟了巨大的可能性。

更新日期：2021-08-09

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