Journal article
Freestanding MoO3−x nanobelt/carbon nanotube films for Li-ion intercalation pseudocapacitors
Nano energy, v 9, pp 355-363
Oct 2014
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Molybdenum trioxide (MoO3) is known as a promising pseudocapacitive material, but low conductivity limits its applications. Hydrogenation is demonstrated to increase the conductivity of MoO3 and hence improve its electrochemical performance. Hydrogenated MoO3 (MoO3−x) shows enhanced conductivity based on, both first principle calculations and single nanobelt measurements. Freestanding MoO3−x/carbon nanotubes (CNT) composite films have been fabricated and showed much improved electrochemical performance compared to composites of CNT and as-synthesized MoO3 (MoO3/CNT). Electrodes showed a specific capacitance of 337F/g (based on the mass of MoO3−x) and a high volumetric capacitance of 291F/cm3 (based on the whole electrode) with excellent rate capability. Also we confirmed that the improved intercalation kinetics and the increased intercalation pseudocapacitance could be attributed to the higher electronic conductivity of MoO3−x, which results in better and faster intercalations of Li+ ions. This electrochemical behavior implies that MoO3−x can serve as a very good negative electrode with high capacitance at high mass loading levels.
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•Hydrogenation is used to increase the conductivity of MoO3 and improve its electrochemical performance as a result.•First principle calculation implies enhanced conductivity of MoO3−x based on DOS after hydrogenation.•Freestanding MoO3−x/CNT films show a high volumetric capacitance of 291F/cm3 with excellent rate capability.•The intercalation process of MoO3−x/CNT films is demonstrated to a surface-controlled capacitive behavior.
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Details
- Title
- Freestanding MoO3−x nanobelt/carbon nanotube films for Li-ion intercalation pseudocapacitors
- Creators
- Xu Xiao - Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR ChinaZehua Peng - Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR ChinaChi Chen - Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR ChinaChuanfang Zhang - Department of Materials Science and Engineering, A.J. Drexel Nanotechnology Institute, Drexel University, Philadelphia, PA 19104, USAMajid Beidaghi - Department of Materials Science and Engineering, A.J. Drexel Nanotechnology Institute, Drexel University, Philadelphia, PA 19104, USAZhenhua Yang - Faculty of Materials, Optoelectronics and Physics, Key Laboratory of Low Dimensional Materials & Application Technology of Ministry of Education, Xiangtan University, Xiangtan 411105, Hunan, ChinaNan Wu - Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR ChinaYunhui Huang - School of Materials Science and Engineering Huazhong University of Science and Technology, Wuhan 430074, Hubei, PR ChinaLing Miao - Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR ChinaYury Gogotsi - Department of Materials Science and Engineering, A.J. Drexel Nanotechnology Institute, Drexel University, Philadelphia, PA 19104, USAJun Zhou - Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR China
- Publication Details
- Nano energy, v 9, pp 355-363
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000344632800040
- Other Identifier
- 991014970029304721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- Physics, Applied