Document Type

Article

Publication Date

4-17-2024

Abstract

Water splitting signifies a breakthrough in the realm of renewable energy, facilitating the production of hydrogen (H2) and oxygen (O2). In this process, the Oxygen evolution reaction (OER) plays a vital role in the process of energy production, which exhibits higher overpotential than the Hydrogen evolution reaction (HER). Therefore, it necessitates the advancement of electrocatalysts that are more active, durable, and stable. Transition metal oxides and hydroxides are promising materials for water splitting, in which Nickel hydroxide (Ni(OH)2) acts as an essential catalyst in electrochemical water splitting for both HER and OER. Herein, Ni(OH)2 samples were prepared via three different methods which are aerogel, hydrothermal, and microwave respectively, and those materials were tested by using 1M KOH as an electrolyzer in an electrode system. Where the results were evaluated for both HER and OER at the current density of 10 mA/cm2, OER overpotential for aerogel shows 266mV, which was comparatively lower than hydrothermal 311mV and microwave 321mV. Similarly, for HER, (Ni(OH)2) aerogel at the same current density shows 224 mV of overpotential, indicating superior performance compared to hydrothermal and microwave methods. Electrochemical impedance spectroscopy (EIS) revealed excellent results for all samples, indicating favorable charge transfer kinetics. Additionally, analysis of the electrochemical surface area, roughness factor, and turn-on frequency showed that aerogel-synthesized nickel hydroxide exhibited superior properties, further enhancing its water-splitting performance. These findings underscore the importance of synthesis method selection in optimizing the water-splitting performance of nickel hydroxide materials for sustainable energy applications.

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