Atomically thin mesoporous NiCo2O4 grown on holey graphene for enhanced pseudocapacitive energy storage
| Autor: | Shanqing Zhang, Li Xu, Ningyan Cheng, Ding Yuan, Shi Xue Dou, Yuhai Dou, Linping Yu, Luke Hencz, Jianmin Ma, Qingbing Xia |
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| Rok vydání: | 2020 |
| Předmět: |
Nanocomposite
Materials science Renewable Energy Sustainability and the Environment Graphene Heterojunction 02 engineering and technology General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 7. Clean energy 01 natural sciences Energy storage Pseudocapacitance 0104 chemical sciences law.invention Chemical engineering law Electrode General Materials Science 0210 nano-technology Mesoporous material |
| Zdroj: | Journal of Materials Chemistry A. 8:13443-13451 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d0ta03007d |
| Popis: | Pseudocapacitive energy storage via Li+ storage at the surface/interface of the electrode is promising for achieving both high energy density and high power density in lithium-ion batteries (LIBs). Thus, we created holey graphene (HG) via an etching method, and then in situ grew atomically thin mesoporous NiCo2O4 nanosheets on the HG surface, resulting in a NiCo2O4–HG heterostructure. Since both NiCo2O4 and HG possess atomic thickness and porous structures, the as-prepared nanocomposite enables efficient electrolyte diffusion and mass transfer, providing abundant accessible surface atoms for enhanced redox pseudocapacitance. Moreover, the strong coupling effect between NiCo2O4 and graphene produces an ultra-large interfacial area and enhanced electrical conductivity, and subsequently promotes the intercalation pseudocapacitance. Consequently, the NiCo2O4@HG exhibits a high specific capacity of 1103.4 mA h g−1 at 0.2C, ∼88.9% contribution from pseudocapacitance at 1 mV s−1, excellent rate capability, and ultra-long life up to 450 cycles with 931.2 mA h g−1 retention, significantly outperforming previously reported electrodes. This work suggests that the maximum exposure and utilization of the surface/interfacial active sites is vital for the construction of high-performance pseudocapacitive energy storage devices. |
| Databáze: | OpenAIRE |
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