期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 53, 期 47, 页码 12789-12793出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201407836
关键词
all-solid-state devices; asymmetric supercapacitors; energy materials; oriented attachment; thin films
资金
- National Natural Science Foundation [21331005, 21422107, 11079004, 21201157, 11321503]
- Chinese Academy of Science [XDB01020300]
- Program for New Century Excellent Talents in University [NCET-13-0546]
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, beta-Co(OH)(2) 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 bCo( OH)(2) single-layers-based electrode with a large capacitance of 2028 Fg(-1). The corresponding all-solid-state asymmetric supercapacitor achieves a high cell voltage of 1.8 V and an exceptional energy density of 98.9 Whkg(-1) at an ultrahigh power density of 17981 Wkg(-1). Also, this integrated nanodevice exhibits excellent cyclability with 93.2% capacitance retention after 10000 cycles, holding great promise for constructing high-energy storage nanodevices.
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