期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 12, 页码 14735-14745出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c03414
关键词
Molybdenum diselenide; sodium-ion hybrid capacitors; 2D few-layer MoSe2; nitrogen-doped carbon sheets; MoSe2@NCS
资金
- Natural Science Foundation of China [U2004209, 21908110, 52125202]
- Natural Science Foundation of Jiangsu Province [BK20190479]
- Fundamental Research Funds for the Central Universities [1191030558]
- Open Fund of Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology [BM2012110]
A template approach was used to prepare MoSe2@NCS composite material, which exhibited improved ion diffusion rate, electronic conductivity, and stability. This composite material could potentially serve as a high-performance anode material for sodium-ion hybrid capacitors.
Molybdenum diselenide (MoSe2) is emerging as a promising anode material for sodium-ion hybrid capacitors (SIHCs) due to its high theoretical capacity. However, the limited rate capability and the poor stability restrain its practical applications. Herein, we report a template approach to prepare two-dimensional (2D) few-layer MoSe2 embedded in nitrogen-doped carbon sheets (MoSe2@NCS). Specifically, graphitic carbon nitride is in situ transformed as the sacrificial template, which not only inhibits the accumulation of the MoSe2 but also endows the MoSe2@NCS composite with a 2D morphology. Benefiting from this architecture, the heterostructure reveals the accelerated ion diffusion rate, enhanced electronic conductivity, and well-controlled volume expansion. Consequently, the MoSe2@NCS delivers a high specific capacity of 398.9 mAh g(-1) at 0.1 A g(-1) and a good rate performance of 229 mAh g(-1) at 5 A g(-1). Meanwhile, an outstanding long cyclic stability with high capacity of 225.2 mAh g(-1) is maintained after 1000 cycles at 1 A g(-1). Hence, a SIHC based on the MoSe2@NCS anode is established and exhibits a high energy of 122.8 Wh kg(-1) at 105 W kg(-1) and power densities of 65.3 Wh kg(-1) at 10500 W kg(-1).
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