Low-crystalline iron oxide hydroxide nanoparticle anode for high-performance supercapacitors
By K. Owusu, Long Qu, Jiantao Li, Zhaoyang Wang, Kangning Zhao, Chao Yang, Kalele Mulonda Hercule, Chao Lin, Changwei Shi, Qiulong Wei and 2 more. Nature Communications, 2017
631 citations recorded by the source corpus.
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. Carbons dominate anode materials for supercapacitors, however the attained energy density remains low. Here the authors fabricate low-crystalline iron oxide-hydroxide nanoparticle anodes with good electrochemical characteristics, exhibiting high stability and energy/power densities in a hybrid supercapacitor.
Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/1a5b93e130beb00eb807959020734ff66b5266cc
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Citations in the corpus
- Phosphorous-containing oxygen-deficient cobalt molybdate as an advanced electrode material for supercapacitors (2019, background): “storage mechanism of electrode materials, conventional carbonaceous materials store electrical energy through electrostatic accumulation of surface charge [3, 4], whereas”
- Design and understanding of dendritic mixed-metal hydroxide nanosheets@N-doped carbon nanotube array electrode for high-performance asymmetric supercapacitors (2019, methodology): “The energy density (Wh kg) of the asymmetric supercapacitor device was calculated from the galvanostatic discharge curve using the following equation [69,82]:”