A highly alkaline-stable metal oxide@metal-organic framework composite for high-performance electrochemical energy storage.
A highly alkaline-stable metal oxide@metal-organic framework composite for high-performance electrochemical energy storage.
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DOI：
10.1093/nsr/nwz137
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发表时间：
2020-02
影响因子：
20.6
通讯作者：
Xu Q
中科院分区：
文献类型：
--
作者：
Zheng S;Li Q;Xue H;Pang H;Xu Q
大多数金属有机框架（MOFs）在暴露于碱性水溶液后几乎不能保持其物理和化学性质，从而排除了它们作为电化学能量存储装置的潜在电极材料的用途。在这里，我们提出了一个高度碱性稳定的金属氧化物@MOF复合材料，Co 3 O 4纳米立方体@Co-MOF（Co 3 O 4 @Co-MOF）的设计和合成，通过可控的和简单的一锅水热法在高碱性条件下。所获得的复合材料具有优异的碱性稳定性，在3.0 M KOH中保持其原始结构至少15天。得益于卓越的碱性稳定性、独特的结构和更大的表面积，Co 3 O 4 @Co-MOF复合材料在0.5 A g− 1下的比电容高达1020 F g− 1，并且具有高循环稳定性，在5 A g−1下5000次循环后仅衰减3.3%。所构建的固态柔性装置表现出21.6 mWh cm-3的最大能量密度。
Most metal–organic frameworks (MOFs) hardly maintain their physical and chemical properties after exposure to alkaline aqueous solutions, thus precluding their use as potential electrode materials for electrochemical energy storage devices. Here, we present the design and synthesis of a highly alkaline-stable metal oxide@MOF composite, Co3O4 nanocube@Co-MOF (Co3O4@Co-MOF), via a controllable and facile one-pot hydrothermal method under highly alkaline conditions. The obtained composite possesses exceptional alkaline stability, retaining its original structure in 3.0 M KOH for at least 15 days. Benefitting from the exceptional alkaline stability, unique structure, and larger surface area, the Co3O4@Co-MOF composite shows a specific capacitance as high as 1020 F g−1 at 0.5 A g−1 and a high cycling stability with only 3.3% decay after 5000 cycles at 5 A g−1. The as-constructed solid-state flexible device exhibits a maximum energy density of 21.6 mWh cm−3.