Journal
JOURNAL OF ENERGY STORAGE
Volume 31, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2020.101663
Keywords
Bimetallic zinc-cobalt selenide; Sea-urchin-like; Hierarchical; Battery-supercapacitor hybrid device
Categories
Funding
- National Natural Science Foundation of China [21471031]
- Fundamental Research Funds for the Central Universities
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Battery-supercapacitor hybrid (BSH) devices have become a bridge to unit high specific energy and power, but they are usually limited in applications by low specific energy of the electroactive materials. Hierarchical bi-metallic selenides are regarded as promising materials to break the restriction because of their superior conductivities, synergistic effect and more electroactive sites. Here, we first apply a bimetallic zinc-cobalt selenide (ZCS) to a BSH device as a battery-type electrode material. Its 3D structure consists of hierarchical sea-urchin-like microspheres, whose surfaces are covered by very rough and porous needle-like nanorods. Benefiting from the unique hierarchical structure, the ZCS delivers a satisfied specific capacity of 1419 C g(-1) at 2 A g(-1), higher than those of ZnSe, CoSe2 and bimetallic zinc-cobalt oxide synthesized under the similar conditions. A ZCS//AC BSH device achieves a broad potential window of 1.6 V, high specific energy of 77.78 Wh kg(-1) at the specific power of 222 W kg(-1) and outstanding cycling performance (80% retention after 10,000 cycles). Two cells in series successfully power a LED for 50 min, suggesting their future application in green energy-storage devices.
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