Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202002600
Keywords
interfacial engineering; MoS2 nanoflowers; polyaniline; theoretical capacity; ultrahigh rate capability
Categories
Funding
- National Natural Science Foundation of China [51972342, 51872056, 51702275, 52062046]
- Taishan Scholar Project of Shandong Province [ts20190922]
- Key Basic Research Project of Natural Science Foundation of Shandong Province [ZR2019ZD51]
- Natural Science Foundation of Xinjiang Autonomous Region [2020D01C019]
- Shandong Provincial Natural Science Foundation, China [ZR201911040344]
- Fundamental Research Funds for the Central Universities [20CX06024A]
- China Postdoctoral Science Foundation [2019TQ0353, 2020M672165]
- Xinjiang Tianshan Xuesong Project [2018XS28]
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By employing a novel polyaniline-mediated interfacial engineering strategy, the growth of interlayer-expanded MoS2 nanoflowers on N-doped graphene has been achieved, leading to enhanced electrochemical kinetics and structural stability. The resulting E-MoS2/NG composite exhibits outstanding electrochemical performance, approaching the theoretical capacity of MoS2 and demonstrating great potential for practical applications in sodium ion capacitors.
Molybdenum disulfide (MoS2) holds great potential for sodium storage due to its high theoretical capacity of 670 mAh g(-1). However, its theoretical capacity is hardly realized because of low conductivity, sluggish electrochemical kinetics, and unsatisfied structural stability. Herein, a polyaniline-mediated interfacial engineering strategy for the growth of interlayer-expanded MoS2 nanoflowers on N-doped graphene land (E-MoS2/NG) using Mo7O246- anions adsorbed on positively charged polyaniline as the seeds is reported. The strong interfacial interaction between MoS2 and graphene through Mo-N bonds as well as ultrathin interlayer-expanded MoS2 can significantly improve the electrochemical kinetics and structural stability. As a result, E-MoS2/NG with a high MoS2 content of 90 wt% shows a high capacity (620 mAh g(-1) at 0.1 A g(-1)), an ultrahigh rate capability (201 mAh g(-1) at 50 A g(-1)), and outstanding cycle performance (390 mAh g(-1) after 1000 cycles at 1 A g(-1)). Importantly, MoS2 in the composite approaches its theoretical capacity of 670 mAh g(-1). Furthermore, the assembled E-MoS2/NG//activated carbon sodium ion capacitor delivers high energy densities of 150 and 82 Wh kg(-1) at 35 and 14 421 W kg(-1), respectively, and a capacity retention of 78.1% after 1500 cycles at 10 A g(-1), demonstrating great potential for practical application.
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