Developing Ag3VO4@ZnO electrode material for efficient oxygen evolution reaction showcasing its potential for sustainable energy applications

[Display omitted] •Hydrothermally produced Ag3VO4@ZnO exhibit remarkable efficiency for electrochemical water splitting.•Ag3VO4@ZnO required only overpotentials of 142 mV for HER and 248 mV for OER, and – for overall water splitting.•Smaller Rct values of 2.6 Ω.cm2 and 153 Ω.cm2 for OER and HER, res...

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Veröffentlicht in:Fuel (Guildford) 2025-01, Vol.379, p.133029, Article 133029
Hauptverfasser: Junaid, Ali, Noreen, Faiqa, Sami, Abdus, Jabbour, Karam, Bibi, Khadija, Ammar Hassan Shah, Muhammad, Bano, Nigarish, Khan, Muhammad Shuaib, Alothman, Asma A., Imran Abbas Shah, Syed
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Sprache:eng
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Zusammenfassung:[Display omitted] •Hydrothermally produced Ag3VO4@ZnO exhibit remarkable efficiency for electrochemical water splitting.•Ag3VO4@ZnO required only overpotentials of 142 mV for HER and 248 mV for OER, and – for overall water splitting.•Smaller Rct values of 2.6 Ω.cm2 and 153 Ω.cm2 for OER and HER, respectively.•Exceptional stability of up to 50 h in practical two-electrode configuration within alkaline environment. Pursuit of green hydrogen production is paramount, given escalating energy demands, resulting in quest for electrodes capable of water electrolysis, yielding green H2 devoid of carbon dioxide, has posed a formidable challenge. Anodes and cathodes crafted from transition metal oxides (TMOs) reign supreme in water splitting due to their robust supporting capacity, potent redox capabilities, facile alteration of valence states, and superior electrical conductivity. In this study, a cutting-edge transition metal oxide nano-composite catalyst, comprised of Ag3VO4@ZnO, is synthesized via a facile hydrothermal method. Ag3VO4@ZnO catalyst showcases remarkable electrocatalytic prowess in both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) when deployed in a 1.0 M potassium hydroxide (KOH) electrolyte, having active surface area of 140 cm2. Operating at a current density of 10 mA cm−2, Ag3VO4@ZnO exhibits diminished overpotentials of 142 mV and 248 mV for HER and OER, respectively. Furthermore, it demonstrates lower Tafel slopes of 92 mV dec−1 and 46 mV dec−1, alongside reduced charge-transfer resistances of 153 Ω.cm2 and 2.60 Ω.cm2 for HER and OER, respectively. Ag3VO4@ZnO showcases largest active surface area, minimal Tafel slope, and lower charge transfer resistance. Practical two electrode configuration exhibited exceptional 50-hour stability, along with Tafel slope values of 73 and 98 mV dec−1 for OER and HER, respectively. The reliable performance of electrode material in practical device configuration, makes it a practically viable alternative for current state-of-the-art catalysts.
ISSN:0016-2361
DOI:10.1016/j.fuel.2024.133029