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Ultrahigh Energy Density Realized by a Single-Layer β-Co(OH)2 All-Solid-State Asymmetric Supercapacitor.
- Source :
- Angewandte Chemie International Edition; Nov2014, Vol. 53 Issue 47, p12789-12793, 5p
- Publication Year :
- 2014
-
Abstract
- A conceptually new all-solid-state asymmetric supercapacitor based on atomically thin sheets is presented which offers the opportunity to optimize supercapacitor properties on an atomic level. As a prototype, β-Co(OH)<subscript>2</subscript> single layers with five-atoms layer thickness were synthesized through an oriented-attachment strategy. The increased density-of-states and 100 % exposed hydrogen atoms endow the β-Co(OH)<subscript>2</subscript> single-layers-based electrode with a large capacitance of 2028 F g<superscript>−1</superscript>. The corresponding all-solid-state asymmetric supercapacitor achieves a high cell voltage of 1.8 V and an exceptional energy density of 98.9 Wh kg<superscript>−1</superscript> at an ultrahigh power density of 17 981 W kg<superscript>−1</superscript>. Also, this integrated nanodevice exhibits excellent cyclability with 93.2 % capacitance retention after 10 000 cycles, holding great promise for constructing high-energy storage nanodevices. [ABSTRACT FROM AUTHOR]
- Subjects :
- ENERGY density
COBALT hydroxides
SUPERCAPACITORS
ASYMMETRIC synthesis
ATOMS
Subjects
Details
- Language :
- English
- ISSN :
- 14337851
- Volume :
- 53
- Issue :
- 47
- Database :
- Complementary Index
- Journal :
- Angewandte Chemie International Edition
- Publication Type :
- Academic Journal
- Accession number :
- 99368293
- Full Text :
- https://doi.org/10.1002/anie.201407836