Investigation on structural, optical and electrochemical behavior of NiO/ZnMn 2 O 4 ternary nanocomposites via two-step
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ORIGINAL PAPER
Investigation on structural, optical and electrochemical behavior of NiO/ZnMn2O4 ternary nanocomposites via two‑step synthesis approach for supercapacitor application C. Lydia pearline1 · M. John Abel2 · A. Pramothkumar2 · N. Senthilkumar3 · P. Anbalagan4 · J. Joseph prince2 Received: 27 February 2020 / Accepted: 18 June 2020 © Institute of Chemistry, Slovak Academy of Sciences 2020
Abstract The present investigation deals with the synthesis of nickel oxide (NiO)/zinc manganite (ZnMn2O4) nanocomposites (NCs) by a two-step approach. The powder X-ray diffraction (PXRD) pattern revealed the existence of face-centered cubic (FCC) phase of NiO and tetragonal rutile phase structure of ZnMn2O4 in NiO/ZnMn2O4 NCs. The optical properties of NiO/ ZnMn2O4NCs have been investigated by the UV-diffuse reflectance Spectroscopy (UV-DRS) and photoluminescence (PL) spectral analysis. The surface morphology and elemental composition of NiO/ZnMn2O4NCs was investigated by field emission scanning electron microscope (FESEM) and energy-dispersive X-ray spectrum (EDX) analysis. The surface area and the nature of porosity of the samples were analyzed using Brunauer–Emmett–Teller (BET) method. The electrochemical properties were investigated from the cyclic voltammetry (CV), galvanostatic charge discharge (GCD) and electrochemical impedance spectroscopy (EIS) measurements. In 0.5 M potassium hydroxide (KOH) electrolyte solution, NiO/ZnMn2O4NCs exhibited higher specific capacitance of 886 F/g at a current density of 1Ag−1 with high cyclic stability over 1000 charge– discharging cycles. Thus, the result demonstrates that the prepared NiO/ZnMn2O4NCs is a promising electrode material for future energy-storage devices. Keywords Two-step approach · NiO/ZnMn2O4 NCs · Optical and electrochemical behavior
Introduction
* P. Anbalagan [email protected] * J. Joseph prince [email protected] 1
Department of Electronics and Communication Engineering, University College of Engineering, Bharathidasan Institute of Technology Campus, Anna University, Tiruchirappalli 620 024, Tamil Nadu, India
2
Department of Physics, University College of Engineering, Bharathidasan Institute of Technology Campus, Anna University, Tiruchirappalli 620 024, Tamil Nadu, India
3
Department of Electronics and Communication Engineering, Ariyalur Engineering College, Ariyalur 621 707, Tamil Nadu, India
4
Department of Electrical and Electronics Engineering, University College of Engineering, Bharathidasan Institute of Technology Campus, Anna University, Tiruchirappalli 620 024, Tamil Nadu, India
In the recent decade, energy-storage systems have fascinated much serious attention in many areas such as fuel cells, batteries, solar cells and supercapacitors (Ates et al. 2019). However, supercapacitors (SCs) have rendered admirable characteristics like rabid charge/discharge rates, long cycles (> 10,000 cycles), self-durability, safe and stability performance, environmental friendliness, high power density and high energy efficiency for
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