Advanced asymmetrical supercapacitors based on graphene hybrid materials

By Hailiang Wang, Yongye Liang, T. Mirfakhrai, Zhuo Chen, H. S. Casalongue, Hongjie Dai. 2011

406 citations recorded by the source corpus.

AbstractSupercapacitors operating in aqueous solutions are low cost energy storage devices with high cycling stability and fast charging and discharging capabilities, but generally suffer from low energy densities. Here, we grow Ni(OH)2 nanoplates and RuO2 nanoparticles on high quality graphene sheets in order to maximize the specific capacitances of these materials. We then pair up a Ni(OH)2/graphene electrode with a RuO2/graphene electrode to afford a high performance asymmetrical supercapacitor with high energy and power density operating in aqueous solutions at a voltage of ∼1.5 V. The asymmetrical supercapacitor exhibits significantly higher energy densities than symmetrical RuO2-RuO2 supercapacitors or asymmetrical supercapacitors based on either RuO2-carbon or Ni(OH)2-carbon electrode pairs. A high energy density of ∼48 W·h/kg at a power density of ∼0.23 kW/kg, and a high power density of ∼21 kW/kg at an energy density of ∼14 W·h/kg have been achieved with our Ni(OH)2/graphene and RuO2/graphene asymmetrical supercapacitor. Thus, pairing up metal-oxide/graphene and metal-hydroxide/graphene hybrid materials for asymmetrical supercapacitors represents a new approach to high performance energy storage.

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

View Paper: https://www.semanticscholar.org/paper/b8ea70ec8117c4bc7b167c6b7492fc81f21496b5

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Electrical and Electronic Engineering

1. Yi Huang
2. Yongsheng Chen
3. D. Mitlin
4. Weitao Zheng
5. Long Zhang
6. Cuimei Zhao
7. Fan Zhang
8. Tengfei Zhang

In Electronic, Optical and Magnetic Materials

1. Yongsheng Chen
2. Yi Huang
3. Weitao Zheng
4. Cuimei Zhao
5. Long Zhang
6. Fan Zhang
7. Tengfei Zhang
8. H. Zanin

In Materials Chemistry

1. Yi Huang
2. Yongsheng Chen
3. Long Zhang
4. Weitao Zheng
5. Cuimei Zhao
6. Rodney S. Ruoff
7. Fan Zhang
8. Yingpeng Wu

Citations in the corpus

• Graphene-nickel cobaltite nanocomposite asymmetrical supercapacitor with commercial level mass loading (2012, background): “Although high energy density is achieved in these studies, the cyclability could be further improved [9, 30, 38, 39].”