期刊
CHEMICAL ENGINEERING JOURNAL
卷 354, 期 -, 页码 1164-1173出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.08.122
关键词
Sodium ion batteries; Density functional theory calculations; Pseudocapacitive charge storages; Hybrid sodium ion capacitors
资金
- National Science Foundation (NSF-DMR) [1505902]
- National Natural Science Foundation of China (NSFC) [51731005, 51771065, 51622101]
- Chutian Scholar of Hubei Province
- National Science Foundation [ECC-1542101]
- University of Washington
- Molecular Engineering & Sciences Institute
- Clean Energy Institute
- National Institutes of Health
- China Scholarship Council [201506120144]
Hybrid sodium ion capacitors (HSICs) can combine the merits of both high-energy density sodium ion batteries (SIBs) and high-power supercapacitors. Currently one of the main challenges in developing high-performance HSICs is the lack of suitable electrode material with superior Na-ion storage capability. In this work, a novel nanocomposite comprised of MoSe2 nanosheets decorated with SnO2 nanoparticles through interfacial Se-O bonding (denoted as O-MoSe2/SnO2) has been rationally synthesized and studied as an electrode for both SIBs and HSICs. The nanocomposite delivers an impressive Na-ion storage capacity of 249 mA h g(-1) even at a high current density of 10 A g(-1). Kinetics analyses using cyclic voltammetry technique reveal the Na+-ion storage in the nanocomposite is governed by a pseudocapacitive charge storage (accounting for similar to 88% at a scan rate of 1.0 mV s(-1)) with fast Na+ insertion/extraction kinetics. Density Functional Theory (DFT) calculations disclose that a charge accumulation occurs at the interface of O-MoSe2/SnO2 nanocomposite, which promotes rapid Na+-ion transport through the interface. Furthermore, a HSIC device is assembled using the O-MoSe2/SnO2 nanocomposite as anode and an activated carbon as cathode, demonstrating a high energy density of 70 Wh kg(-1) at a power-output of 62 W kg(-1) with an excellent cycling stability of high capacitance retention rate of 94% for 6000 cycles at 5 A g(-1).
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