Nickel hexacyanoferrate film coated pencil graphite electrode as sensor and electrode material for environment and energy applications

Abstract

In this present work, a simple electroless deposition method is used for the fabrication of hexacyanoferrate(III)-nickel deposited pencil graphite (HCF-Ni-PGE) electrode and applied as an electrochemical sensor for selective and simultaneous determination of ortho-I and para-nitrophenol II isomers. The fabricated HCF-Ni-PGE was characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, and elemental mapping. The electrochemical analysis was carried out using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques in 0.1 M KCl containing K 4 [Fe(CN) 6 ]. The redox (Fe 2+/3+) peak currents were enormously increased due to the successful enhancement in the electroactive surface area of PGE from 0.4 to 1.57 cm 2 for HCF-Ni-PGE. Further, CV and EIS support the HCF and Ni coating on the PGE surface enhanced the electronic conductivity of HCF-Ni-PGE. The electrochemical sensor application of HCF-Ni-PGE was analysed using CV and differential pulse voltammetry towards the determination of o-and p-NP in 0.1 M PBS (pH 6.0). The reduction currents of I and II at HCF-Ni-PGE was enhanced two times compared with the PGE with better resolution. This, the enhanced activity is due to the positive synergetic effect which increased an electroactive surface area, and electronic conductivity. The limit of detection (LOD) values at HCF-Ni-PGE for I and II isomers are 1.98 × 10 −7 and 1.43 × 10 −7 M with S/N = 3, respectively. The practical applicability of the electrochemical sensor has been investigated in the presence of common interfering agents such as Na + , SO 4 2− and phenol. The simple electroless deposition used for the fabrication of HCF-Ni-PGE electrode possessed high surface area and high conductivity, it can also be applicable in the field of energy storage devices of supercapacitor, and battery, fuel cells and solar cells as electrode materials and photocatalysts.

Effect of valence state of cobalt in cobalt hexacyanoferrate coprecipitated at different temperatures on electrochemical behavior

“…Owing to the three-dimensional (3D) open framework, Prussian blue analogs (PBAs) have become promising cathode materials for fast rechargeable aqueous Na-ion batteries. [1][2][3][4][5][6][7][8][9][10][11][12] The simple coprecipitation for PBA fabrication has further piqued the interest of the scientific community in this cathode material. Conversely, conventional cathode materials, including various layered oxides are typically prepared by pyrolysis at high temperatures.…”

“…Owing to the three‐dimensional (3D) open framework, Prussian blue analogs (PBAs) have become promising cathode materials for fast rechargeable aqueous Na‐ion batteries 1‐12 . The simple coprecipitation for PBA fabrication has further piqued the interest of the scientific community in this cathode material.…”

One‐step synthesis of hierarchical structured nickel copper sulfide nanorods with improved electrochemical supercapacitor properties

“…The advancement of global energy consumption and environmental impact are being reported in many of the research and industrial activities. Tremendous amount of interest has been shown in the field of traditional energy resources to improve pivotal features like storing high amount of power for longer duration in storage systems 1,2 . The need to develop an advanced energy storage system with low cost, good efficiency, environment‐friendly and excellent capacitance are being developed in recent times.…”