Chemically Bonding NiFe-LDH Nanosheets on rGO for Superior Lithium-Ion Capacitors
| Autor: | Chaofeng Liu, Zachary G. Neale, Meng Tian, Jiqi Zheng, Guozhong Cao, Donghui Long |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Layered double hydroxides chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Energy storage 0104 chemical sciences law.invention Ion Capacitor chemistry Chemical engineering law engineering General Materials Science Lithium 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 11:35977-35986 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.9b10719 |
| Popis: | Layered double hydroxides (LDHs) have attracted tremendous interest for applications in energy harvest and storage. However, the aggregation of nanosheets compromises the accessible active sites and limits their electrochemical performance, especially at high rates. The present study reports the synthesis of highly dispersed NiFe-LDH nanosheets anchored on reduced graphene oxide (NiFe-LDH/rGO) composites chemically bonded via a facile one-step hydrothermal method. Defect-riched rGO provides abundant active sites for heterogeneous nucleation of NiFe-LDH nanosheets, achieving the much efficient charge transfer between rGO and NiFe-LDH as compared to physically mixed NiFe-LDH + rGO. The crystallite size can effectively reduce to 5.5 nm smaller than 15.1 nm of NiFe-LDH without rGO, beneficial to expose more active surface for fast ion diffusion and redox reactions. NiFe-LDH/rGO as an anode material in lithium-ion batteries shows superior lithium storage capacity with 1202 mAh g |
| Databáze: | OpenAIRE |
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