MOF-derived Fe2O3 decorated with MnO2 nanosheet arrays as anode for high energy density hybrid supercapacitor

By Yucheng Chen, Chenxia Kang, Lingjie Ma, Likang Fu, Guanghui Li, Qiang Hu, Qiming Liu. 2021

136 citations recorded by the source corpus.

Abstract The development of high-performance anode materials to match the fast-burgeoning cathodes is essential for the fabrication of high-energy–density supercapacitors. Hematite Fe2O3, with ultra-high theoretical capacitance, has been considered as a promising anode candidate, but the insufficient utilization of the energy storage potential range (mainly in −1.1 V ~ -0.5 V) creates obstacles for further expansion of its electrochemical performance. In this work, a pinecone-like core–shell composite, with vertically grown MnO2 nanosheet arrays decorated on the M−Fe2O3 prepared via sacrificing the Fe-MOF (MIL-88A) template, was synthesized to achieve the excellent energy storage effect at a wide potential range from −1.1 V to 0.3 V. As adjusting the MnO2 coating amount to a suitable level, the M−Fe2O3@MnO2 composite exhibits a prominent specific capacitance up to 908.5F g−1 as well as excellent cycle stability. Pseudocapacitance analysis interprets the essence of the kinetics process of composite materials in the energy storage process. The hybrid supercapacitor (HSC), assembled with pinecone-like M−Fe2O3@MnO2 as the anode and urchin-like NiCo2O4 as the cathode, delivers a high energy density of 86.8 Wh kg−1 at 804.1 W kg−1. Unsurprisingly, 25 parallel blue LEDs powered by two HSC devices can illuminate for over an astonishing 210 min. This work fabricates a promising anode material for high-energy–density hybrid supercapacitors, and the strategy of complementary energy storage potential provides a novel approach for constructing high-performance energy storage systems.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/7b1ad286382fbf517fe4f279e1ffae05b698f0ce