title: Low-crystalline iron oxide hydroxide nanoparticle anode for high-performance supercapacitors.
abstract: 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-1at 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-1at a power density of 1.27 kW kg-1. A packaged device delivers gravimetric and volumetric energy densities of 33.14 Wh kg-1and 17.24 Wh l-1, respectively.
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
authors.forename: Kwadwo Asare
authors.identifier: 0000-0002-4719-2981
authors.initials: KA
authors.lastname: Owusu
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.|Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC 3800, Australia.
authors.forename: Longbing
authors.initials: L
authors.lastname: Qu
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
authors.forename: Jiantao
authors.initials: J
authors.lastname: Li
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
authors.forename: Zhaoyang
authors.initials: Z
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
authors.forename: Kangning
authors.initials: K
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Yang
authors.affiliation: Department of Chemistry, University of Kinshasa, No. 1 University Street, BP. Kinshasa IX, Democratic Republic of the Congo.
authors.forename: Kalele Mulonda
authors.initials: KM
authors.lastname: Hercule
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Lin
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
authors.forename: Changwei
authors.initials: C
authors.lastname: Shi
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
authors.forename: Qiulong
authors.initials: Q
authors.lastname: Wei
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
authors.forename: Liqiang
authors.initials: L
authors.lastname: Mai