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Molecular-Level Heterostructures Assembled from Titanium Carbide MXene and Ni–Co–Al Layered Double-Hydroxide Nanosheets for All-Solid-State Flexible Asymmetric High-Energy Supercapacitors
ACS Energy Letters ( IF 22.0 ) Pub Date : 2017-12-11 00:00:00 , DOI: 10.1021/acsenergylett.7b01063
Ruizheng Zhao 1 , Mengqiao Wang 1 , Danyang Zhao 1 , Hui Li 1 , Chengxiang Wang 1 , Longwei Yin 1
Affiliation  

Unique layered Ti3C2/Ni–Co–Al layered double hydroxide (LDH) heterostructures alternatively stacked with molecular-level nanosheets are for the first time synthesized by a facile liquid-phase cofeeding and electrostatic attraction heteroassemble strategy between negatively charged Ti3C2 and positively charged Ni–Co–Al-LDH nanosheets. The molecular-level Ti3C2/Ni–Co–Al-LDH heterostructures possessing the merits of both conductive and pseudocapacitive components can show greatly enhanced dynamic behavior in Faradaic reaction, which is significant for obtaining a high power density. Electrons penetrate in Ti3C2 layers, while ions diffuse rapidly along two-dimensional galleries, displaying the shortest diffusion pathway and highest efficiency for charge transfer. The Ti3C2/Ni–Co–Al-LDH heterostructure exhibits a specific capacitance of 748.2 F g–1 at current density of 1 A g–1, showing an enhanced rate capacity. Importantly, a maximum energy density of 45.8 Wh kg–1 is obtained when Ti3C2/Ni–Co–Al-LDH acts as the positive electrode for an all-solid-state flexible asymmetric supercapacitor. The results indicate that molecular-level heterotructure is a promising candidate for future high-energy supercapacitors.

中文翻译:

由碳化钛MXene和Ni-Co-Al层状双氢氧化物纳米片组装而成的分子水平异质结构,用于全固态柔性不对称高能超级电容器

独特的层状Ti 3 C 2 / Ni-Co-Al层状双氢氧化物(LDH)交替与分子级纳米片堆叠在一起,是通过带电荷的Ti 3 C之间的便捷液相共进料和静电吸引异质组装策略首次合成的2张带正电的Ni-Co-Al-LDH纳米片。同时具有导电和拟电容成分优点的分子级Ti 3 C 2 / Ni-Co-Al-LDH异质结构可在法拉第反应中显示出大大增强的动态行为,这对于获得高功率密度是重要的。电子渗透到Ti 3 C 2中离子层沿二维通道快速扩散,显示出最短的扩散路径和最高的电荷转移效率。Ti 3 C 2 / Ni-Co-Al-LDH异质结构在1 A g –1的电流密度下具有748.2 F g –1的比电容,显示出更高的倍率容量。重要的是,当Ti 3 C 2 / Ni-Co-Al-LDH作为全固态柔性不对称超级电容器的正电极时,最大能量密度为45.8 Wh kg –1。结果表明,分子水平的异质结构是未来高能超级电容器的有希望的候选者。
更新日期:2017-12-11
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