In-situ construction of hierarchical NPO@CNTs derived from Ni-MOF as ultra-high energy storage electrode for battery-type supercapacitor

超级电容器 材料科学 电极 电容 电化学 成核 化学工程 纳米技术 储能 电导率 导电体 电池(电) 化学 复合材料 工程类 物理化学 功率(物理) 物理 有机化学 量子力学
作者
Jiaxi Xu,Hao Guo,Yuan Chen,Fan Yang,Yanrui Hao,Jiaying Tian,Yinsheng Liu,Zongyan Lu,Xiao‐Qin Wei,Wu Yang
出处
期刊:Journal of energy storage [Elsevier BV]
卷期号:68: 107819-107819 被引量:9
标识
DOI:10.1016/j.est.2023.107819
摘要

Owing to the poor electric conductivity and inferior cyclic stability of transition metal phosphates, it is an important challenge to develop MOF-derived transition metal phosphate electrode with open frame structures and high redox-active sites for superior conductivity, favorable chemical stability and enhanced charge storage capacity. Metal organic frameworks (MOFs) are the promising precursors/templates for the construction of porous micro- and nano-structured metal phosphates due to their adjustable structure and composition, abundant stratified pore structure and high specific surface area. However, the low conductivity of phosphates and even MOF-derived electrode often requires to be improved with a conductive network to enhance the overall energy density and cycle stability. Herein, three-dimensional interconnected hierarchical phosphorylated Ni-MOF (Ni2P2O7, NPO)@CNTs nanostructure were synthesized by using Ni-MOF@CNTs as the sacrificing precursor in which CNTs not only acted as a conductive network but also provided rich nucleation sites for the anchoring of redox-active centers. The prepared NPO@CNTs electrode achieved excellent electrochemical performance with an ultrahigh specific capacitance of 3237.6 F g−1 at 1 A g−1 and a specific capacitance retention of 67.1 % at 10 A g−1 and the assembled hybrid supercapacitor (HSC) device showed a maximum specific energy density of 41.9 Wh kg−1 at 750 W kg−1 and long cyclic lifespan with a capacitane retention of 91.0 % at 1 A g−1 after 5000 cycles.
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