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^-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.

SUBMITTER: Owusu KA 

PROVIDER: S-EPMC5343484 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature