Journal
RSC ADVANCES
Volume 6, Issue 19, Pages 15941-15951Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra27775b
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Funding
- Department of Science and Technology, India [IF131153]
- DST-SERB, INDIA [GAP 07/14]
- XII Five Year Plan project MULTIFUN of CSIR [CSC-0101]
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A facile synthesis of sheets-on-sheet mesoporous Ni-Co-hydroxide/reduced graphene oxide (RGO) nanocomposites via the chemical decomposition of nickel cobalt hexacyanoferrate (NiCoHCF) complex is demonstrated. The chemical decomposition of NiCoHCF by NaOH resulted in the formation of Ni-Co-hydroxide directly on RGO that was confirmed by powder XRD analysis. The formation of Ni-Co-hydroxide nanosheets on RGO nanosheet was revealed using FE-SEM and HR-TEM analyses. The mesoporous nature of sheets-on-sheet Ni-Co-hydroxide/RGO nanocomposites was realized using BET surface area analysis and pore-size distribution. The electrochemical performance of Ni-Co-hydroxide/RGO nanocomposites with different weight ratios was evaluated using cyclic voltammetry, galvanostatic charge discharge measurements and electrochemical impedance spectroscopic analysis. The nanocomposite with a 1 : 1 ratio of Ni-Co-hydroxide and RGO exhibited a very high specific capacitance of 835 F g(-1) at 1 A g(-1) current density with an excellent capacity retention of 92% even after 5000 cycles. The magnetic properties of pristine Ni-Co-hydroxide and its nanocomposites with RGO were also investigated. The reported method is simple and scalable for growth of Ni-Co-hydroxide nanosheets over RGO nanosheets.
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