Synthesis and electrochemical performances of maricite-NaMPO4 (M = Ni, Co, Mn) electrodes for hybrid supercapacitors

Baskar Senthilkumar; Kalimuthu Vijaya Sankar; Leonid Vasylechko; Yun-Sung Lee; Ramakrishnan Kalai Selvan

doi:10.1039/C4RA06050D

Synthesis and electrochemical performances of maricite-NaMPO₄ (M = Ni, Co, Mn) electrodes for hybrid supercapacitors†

Baskar Senthilkumar,^a Kalimuthu Vijaya Sankar,^a Leonid Vasylechko,^b Yun-Sung Lee^c and Ramakrishnan Kalai Selvan*^a

* Corresponding authors

^a Solid State Ionics & Energy Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore 641 046, India
E-mail: selvankram@buc.edu.in
Tel: +91-422-2428446

^b Semiconductor Electronics Department, Lviv Polytechnic National University, 12 Bandera Street, Lviv 79013, Ukraine

^c Faculty of Applied Chemical Engneering, Chonnam National University, Gwangju 500-757, Korea

Abstract

Sodium metal phosphates, NaMPO₄ (M = Mn, Co and Ni) were successfully synthesized by a solution combustion synthesis (SCS) method using glycine-nitrate as a precursor. An XRD Rietveld refinement method revealed the crystal structure and lattice parameters of NaMPO₄ (M = Mn, Co and Ni). For the first time, the crystal structure parameters of the orthorhombic NaNiPO₄ maricite-type phase were evaluated. Similarly, it was identified that the NaCoPO₄ and NaMnPO₄ have high temperature hexagonal and maricite phases, respectively. The calculated BET specific surface areas (S_BET) of NaMnPO₄, NaCoPO₄ and NaNiPO₄ were 17.7, 22.6 and 18.7 m² g⁻¹, respectively. The NaMPO₄ (M = Mn, Co and Ni) electrode exhibits good specific capacitance in 1 M NaOH electrolyte, when compared with 1 M Na₂SO₄, 1 M NaNO₃ and 1 M NaCl. This difference in specific capacitance was analysed based on the influence of electrolyte anions (Cl⁻, SO₄²⁻, OH⁻ and NO₃⁻) and pH conditions of the electrolyte solution. Overall, maricite-NaNiPO₄ nanoparticles provided a high specific capacitance of 368 F g⁻¹ compared to NaMnPO₄ (163 F g⁻¹) and NaCoPO₄ (249 F g⁻¹) in 1 M NaOH electrolyte. Subsequently, a hybrid supercapacitor (AC‖NaNiPO₄) was fabricated and it delivered a good specific capacitance and cyclic stability compared to the commercially available device.

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Article information

DOI: https://doi.org/10.1039/C4RA06050D
Article type: Paper
Submitted: 21 Jun 2014
Accepted: 06 Oct 2014
First published: 22 Oct 2014

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RSC Adv., 2014,4, 53192-53200

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Synthesis and electrochemical performances of maricite-NaMPO₄ (M = Ni, Co, Mn) electrodes for hybrid supercapacitors

B. Senthilkumar, K. V. Sankar, L. Vasylechko, Y. Lee and R. K. Selvan, RSC Adv., 2014, 4, 53192 DOI: 10.1039/C4RA06050D

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