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Metal-organic framework derived hierarchical NiCo2O4 triangle nanosheet arrays@SiC nanowires network/carbon cloth for flexible hybrid supercapacitors
Journal of Materials Science & Technology ( IF 11.2 ) Pub Date : 2021-01-16 , DOI: 10.1016/j.jmst.2020.10.085
Xuemin Yin , Hejun Li , Ruimei Yuan , Jinhua Lu

To overcome the disadvantages of traditional powder electrodes, such as the insufficient performance, the aggregation of active materials, and the complex fabrication process, rationally constructing free-standing electrode materials with hierarchical architecture is an effective and promising method, which could further improve the electrochemical properties. Herein, using metal-organic framework nanoarrays (MOFNAs) as self-sacrificial templates and SiC nanowires (SiCNWs) network as nanoscale conductive skeletons, we successfully fabricated the hierarchical core-shell SiCNWs@NiCo2O4NAs on carbon cloth (CC) substrate. Taking advantages of structural merits, such as hierarchical porous triangle-like NiCo2O4NAs, the interwoven SiCNWs network and conductive CC substrate, when evaluated as a binder-free supercapacitor electrode, the CC/SiCNWs@NiCo2O4NAs shows a high specific capacitance of 1604.7 F g-1 (specific capacity of 222.9 mA h g-1) at the 0.5 A g-1, good rate performance, and excellent cycling stability. Significantly, the hybrid supercapacitor assembled with CC/SiCNWs@NiCo2O4NAs as the cathode and MOF derived CC/SiCNWs@CNAs as the anode, could deliver a high specific density of 49.9 W h kg-1 at a specific power of 800 W kg-1, stable cycling performance, and good flexibility. Impressively, this feasible strategy for fabricating hierarchical structure displays great potential in the field of energy storage.



中文翻译:

金属-有机骨架衍生的分层NiCo2O4三角形纳米片阵列@SiC纳米线网络/用于柔性混合超级电容器的碳布

为克服传统粉状电极的性能不足,活性物质聚集,制造工艺复杂等缺点,合理构建具有分层结构的自立式电极材料是一种行之有效的方法,可以进一步改善电化学性能。属性。在本文中,我们使用金属有机框架纳米阵列(MOF NAs)作为自我牺牲模板,并使用SiC纳米线(SiC NWs)网络作为纳米级导电骨架,我们成功地在碳布(CC)上制备了分层的核壳SiC NW @NiCo 2 O 4NAs。 ) 基质。利用结构优点,例如分层多孔三角形镍钴合金2个Ó 4NAs,交织的SiC纳米线网络和导电基底CC,当作为不含粘合剂的超电容器电极评价中,CC /碳化硅纳米线@NiCo 2 ö 4NAs示出了高的比的1604.7 F G电容-1的222.9(比容量在0.5 A g -1时达到mA hg -1),良好的倍率性能和出色的循环稳定性。值得注意的是,混合超级电容器以CC / SiC NW @NiCo 2 O 4NAs为阴极,并由MOF衍生出CC / SiC NW @C NAs。作为阳极,可以在800 W kg -1的比功率下提供49.9 W h kg -1的高比密度,稳定的循环性能和良好的柔韧性。令人印象深刻的是,这种可行的分层结构制造策略在储能领域显示出巨大潜力。

更新日期:2021-01-18
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