MoSe2 nanosheets embedded in nitrogen/phosphorus co-doped carbon/graphene composite anodes for ultrafast sodium storage

被引:35
|
作者
Wu, Junxiong [1 ]
Yu, Jiefu [1 ]
Liu, Jiapeng [1 ]
Cui, Jiang [1 ]
Yao, Shanshan [1 ]
Ihsan-Ul Haq, Muhammad [1 ]
Mubarak, Nauman [1 ]
Susca, Alessandro [1 ]
Ciucci, Francesco [1 ,2 ,3 ]
Kim, Jang-Kyo [1 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Clear Water Bay, Hong Kong, Peoples R China
[2] Hong Kong Univ Sci & Technol, Dept Chem & Biol Engn, Clear Water Bay, Hong Kong, Peoples R China
[3] Guangzhou HKUST Fok Ying Tung Res Inst, Hong Kong, Peoples R China
关键词
MoSe2; Carbon; Composite; Sodium-ion batteries; DFT calculations; FEW-LAYER MOSE2; ION BATTERIES; RATIONAL DESIGN; RATE CAPABILITY; GRAPHENE OXIDE; POROUS CARBON; LITHIUM; PERFORMANCE; ELECTROCATALYSTS; NANOSPHERES;
D O I
10.1016/j.jpowsour.2020.228660
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Sodium-ion batteries have been considered a cost-effective alternative to lithium-ion batteries because of the cheap and abundant sodium reserves. However, the sluggish kinetics arising from the slow ion and electron transport, particularly at high rates, is the main bottleneck of fast sodium storage. Here, few-layer MoSe2 encapsulated by nitrogen/phosphorus (N/P) co-doped carbon and reduced graphene oxide (MoSe2@NPC/rGO) composites are fabricated through a simple polymerization reaction followed by selenization. The two-dimensional composite nanosheets effectively shorten the ion diffusion length while the few-layer MoSe2 exposes a large surface area to the electrolyte. The NPC/rGO sheets intercalated within the composites function as channels for fast electron transfer and surface reactions. First-principles calculations show quick Na transport rates on the surface of MoSe2, and quantitative kinetics analysis reveals a pseudocapacitance-dominated Na+ storage mechanism at high rates. Thanks to the ameliorating functional features and highly reversible conversion reactions, the MoSe2@NPC/rGO electrode delivers a reversible capacity of similar to 340 mA h g(-1) after 500 cycles at 0.5 A g(-1) with a high contribution by surface capacitance. It also possesses a high reversible capacity of similar to 100 mA h g(-1) even at an extremely high current density of 50 A g(-1), presenting potential application as anodes for high-power sodium-ion batteries.
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页数:9
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