Author(s) Owusu, K.Asare; Qu, L.; Li, J.; Wang, Z.; Zhao, K.; Yang, C.; Hercule, K.Mulonda; Lin, C.; Shi, C.; Wei, Q.; Zhou, L.; Mai, L.
Journal Nat Commun
Date Published 2017 Mar 06

Carbon materials are generally preferred as anodes in supercapacitors; however, their low capacitance limits the attained energy density of supercapacitor devices with aqueous electrolytes. Here, we report a low-crystalline iron oxide hydroxide nanoparticle anode with comprehensive electrochemical performance at a wide potential window. The iron oxide hydroxide nanoparticles present capacitances of 1,066 and 716 F g(-1) at mass loadings of 1.6 and 9.1 mg cm(-2), respectively, a rate capability with 74.6% of capacitance retention at 30 A g(-1), and cycling stability retaining 91% of capacitance after 10,000 cycles. The performance is attributed to a dominant capacitive charge-storage mechanism. An aqueous hybrid supercapacitor based on the iron oxide hydroxide anode shows stability during float voltage test for 450 h and an energy density of 104 Wh kg(-1) at a power density of 1.27 kW kg(-1). A packaged device delivers gravimetric and volumetric energy densities of 33.14 Wh kg(-1) and 17.24 Wh l(-1), respectively.

DOI 10.1038/ncomms14264
ISSN 2041-1723
Citation Nat Commun. 2017;8:14264.

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