Rational design of nickel iron layered double hydroxide for electrochemical water splitting process
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Date
2024
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UMT, Lhr
Abstract
The current study investigates the highly efficient electrocatalytic approach for water splitting. Progress made in developing materials that could lead to a simple, viable, and convenient method of producing hydrogen from water, which is of main interest currently due to the exhaustion of non-renewable resources. The goal was to create an efficient source to improve the catalytic activity of the precursor NiFe LDH by incorporating carbon foam (CF), followed by doping NiFe LDH with different ratios of CoNO3. The electrocatalyst NiFe layered double hydroxide (LDH) with various compositions of Cox (x = 0.00-0.194) was synthesized via a simple and environment friendly one-step hydrothermal process. The successful synthesis of all the materials with NiFe LDH each show specific electrocatalysis for HER, that suggests their potential as cost-effective and efficient tools for producing current (in mA) compared to other methods, which often involve noble-metal usage and complexities. The synthesized materials were evaluated for their electrocatalytic performance through cyclic voltammetry (CV), linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS). From several compositions of Fe2+-doped layered double hydroxide (NiFe (II, III)-LDH) on carbon foam (NiFe@CF), (NiFe:CF = 1:10) evinces a current value -1.5 mA for HER. Experimental results indicated that optimizing NiFe with different Co-doping ratios deftly proved successful and an electrocatalyst for water splitting and self-powered electrochemical systems was established. The hopeful behavior of Co-doped NiFe LDH includes the technique for creating current for the electrochemical water splitting process (EWS) using electrochemical measures such as LSV, CV, and EIS. In this case, 1% NiFe+Cox (x = 0.194) showed the current value of 9.182 mA during OER while -54.00 mA during HER. CV was employed to investigate the charge transport behavior of the electrodes modified with NiFe LDH, NiFe@CFx (x=0.01 0.05, 0.005), 1:2, 1:10, and 2:1 respectively, and NiFe+Cox (x=0.00-0.194) LDH demonstrating a linear correlation between currents and scan rates. EIS was performed to examine the charge transfer resistance in oxidation and reduction reactions. Thus, it enabled to obtain the quantitative information of the electrochemical system by combination of acquiring these Bode and Nyquist plots. In comparison to all synthesized electrocatalysts, the optimized catalyst 1% NiFe+Cox (x= 0.194) outperformed other prepared ECs with a low onset potential of -1.12 V and a low overpotential of 327.5 mV at a current density of 10 mA/cm2. Overall, this research depicts the improved modified electrode by comparison of three working electrodes and then assessing the parameters that enhance electron transfer in selectively detecting current values suggesting promising potential for future needs of hydrogen fuel production.