Journal
ACS ENERGY LETTERS
Volume 3, Issue 1, Pages 132-140Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b01063
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Funding
- Sate Key Program of National Natural Science of China [51532005]
- National Nature Science Foundation of China [51472148, 51602181, 51272137]
- Tai Shan Scholar Foundation of Shandong Province
- China Postdoctoral Science Foundation [2015M582088]
- Fundamental Research Fund of Shandong University
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Unique layered Ti3C2/Ni-Co-Al layered double hydroxide (LDH) heterostructures alternatively stacked with molecular-level nanosheets are for the first time synthesized by a facile liquid-phase cofeeding and electrostatic attraction hetero-assemble strategy between negatively charged Ti3C2 and positively charged Ni-Co-Al-LDH nanosheets. The molecular-level Ti3C2/ Ni-Co-Al-LDH heterostructures possessing the merits of both conductive and pseudocapacitive components can show greatly enhanced dynamic behavior in Faradaic reaction, which is significant for obtaining a high power density. Electrons penetrate in Ti3C2 layers, while ions diffuse rapidly along two-dimensional galleries, displaying the shortest diffusion pathway and highest efficiency for charge transfer. The Ti3C2/Ni-Co-Al-LDH heterostructure exhibits a specific capacitance of 748.2 F at current density of 1 A g(-1) showing an enhanced rate capacity. Importantly, a maximum energy density of 45.8 Wh kg(-1) is obtained when Ti3C2/Ni-Co-Al-LDH acts as the positive electrode for an all-solid-state flexible asymmetric supercapacitor. The results indicate that molecular-level heterotructure is a promising candidate for future high-energy supercapacitors.
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