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A universal strategy for metal oxide anchored and binder-free carbon matrix electrode: A supercapacitor case with superior rate performance and high mass loading

机译:金属氧化物锚固和无粘结剂碳基电极的通用策略:具有卓越的倍率性能和高质量负载的超级电容器外壳

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摘要

Despite the significant advances in preparing carbon-metal oxide composite electrodes, strategies for seamless interconnecting of these two materials without using binders are still scarce. Herein we design a novel method for in situ synthesis of porous 2D-layered carbon–metal oxide composite electrode. Firstly, 2D-layered Ni-Co mixed metal-organic frameworks (MOFs) are deposited directly on nickel foam by anodic electrodeposition. Subsequent pyrolysis and activation procedure lead to the formation of carbon–metal oxides composite electrodes. Even with an ultrahigh mass loading of 13.4 mg cm, the as-prepared electrodes exhibit a superior rate performance of 93% (from 1 to 20 mA cm), high capacitance (2098 mF cm at a current density of 1 mA cm), low resistance and excellent cycling stability, making them promising candidates for practical supercapacitor application. As a proof of concept, several MOF derived electrodes with different metal sources have also been prepared successfully via the same route, demonstrating the versatility of the proposed method for the preparation of binder-free carbon–metal oxide composite electrodes for electrochemical devices.
机译:尽管在制备碳-金属氧化物复合电极方面取得了显着进展,但仍缺乏用于不使用粘合剂而将这两种材料无缝互连的策略。在这里,我们设计了一种新颖的多孔2D层碳-金属氧化物复合电极的原位合成方法。首先,通过阳极电沉积将2D层Ni-Co混合金属-有机骨架(MOF)直接沉积在泡沫镍上。随后的热解和活化过程导致形成碳-金属氧化物复合电极。即使在13.4 mg cm的超高质量负载下,所制备的电极仍具有93%(从1到20 mA cm)的优异倍率性能,高电容(电流密度为1 mA cm时为2098 mF cm),低电容电阻和出色的循环稳定性,使其成为实际超级电容器应用的有希望的候选者。作为概念证明,也已通过同一途径成功制备了几种具有不同金属来源的由MOF衍生的电极,证明了所提出的用于电化学装置的无粘合剂碳-金属氧化物复合电极制备方法的多功能性。

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