Suppr超能文献

在类石墨烯二氧化锰纳米片上组装空心硫化钴纳米笼阵列,用于高性能电化学电容器。

Assembling Hollow Cobalt Sulfide Nanocages Array on Graphene-like Manganese Dioxide Nanosheets for Superior Electrochemical Capacitors.

机构信息

Institute for Clean Energy & Advanced Materials, Southwest University , Chongqing 400715, P. R. China.

出版信息

ACS Appl Mater Interfaces. 2017 Oct 11;9(40):35040-35047. doi: 10.1021/acsami.7b12069. Epub 2017 Sep 26.

Abstract

Metal-organic framework (MOF)-derived hollow cobalt sulfides have attracted extensive attention due to their porous shell that provides rich redox reactions for energy storage. However, their ultradispersed structure and the large size of MOF precursors result in relatively low conductivity, stability, and tap density. Therefore, the construction of an array of continuous hollow cages and tailoring of the inner cavity of MOF-derived materials is very effective for enhancing the electrochemical performance. Herein, we in situ assembled small Co-based zeolitic imidazolate framework (ZIF-67) on the both sides of negatively charged MnO nanosheets to fabricate a hierarchical sandwich-type composite with hollow cobalt sulfide nanocages/graphene-like MnO. The graphene-like MnO nanosheets acted not only as a structure-directing agent to grow a ZIF-67 array but also as a promising electroactive material of electrochemical capacitors to provide capacitance. As an electrode material of supercapacitors, the as-prepared composites exhibit high specific capacitance (1635 F g at 1 A g), great rate performance (reaching 1160 F g at 10 A g), and excellent cycling stability (80% retention after 5000 cycles). The outstanding electrochemical properties of our designed materials can be attributed to the unique nanostructure that improved electrical conductivity, created more reactive active sites, and increased the diffusion pathway for electrolyte ions.

摘要

基于金属-有机框架(MOF)的中空钴硫化物由于其多孔外壳为储能提供了丰富的氧化还原反应,因此受到了广泛关注。然而,其超分散的结构和 MOF 前体的较大尺寸导致其导电性、稳定性和振实密度相对较低。因此,构建连续的空心笼阵列和调整 MOF 衍生材料的内腔对于提高电化学性能非常有效。在此,我们通过原位组装小尺寸的 Co 基沸石咪唑酯骨架(ZIF-67)在带负电荷的 MnO 纳米片的两侧,制备了一种具有中空钴硫化物纳米笼/类石墨烯 MnO 的分级三明治型复合材料。类石墨烯 MnO 纳米片不仅作为 ZIF-67 阵列的结构导向剂,而且作为电化学电容器的有前途的电活性材料提供电容。作为超级电容器的电极材料,所制备的复合材料表现出高比电容(在 1 A g 时为 1635 F g)、优异的倍率性能(在 10 A g 时达到 1160 F g)和出色的循环稳定性(在 5000 次循环后保持 80%)。我们设计的材料具有出色的电化学性能,这归因于独特的纳米结构,提高了电导率,创造了更多的反应活性位点,并增加了电解质离子的扩散途径。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验