Synergistic Effect of Allium-like Ni 9 S 8 & Cu 7 S 4 Electrodeposited on Nickel Foam for Enhanced Water Splitting Activity.

Autor: Mottakin M; Solar Energy Research Institute (SERI, Universiti Kebangsaan Malaysia (UKM) (@ The National University of Malaysia), Bangi, 43600, Selangor, Malaysia.; Dept. of Applied Chemistry and Chemical Engineering, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj, 8100, Bangladesh., Selvanathan V; Institute of Sustainable Energy, Universiti Tenaga Nasional (The Energy University) Jalan Ikram-Uniten, Kajang, 43000, Selangor, Malaysia., Ariful Islam M; Solar Energy Research Institute (SERI, Universiti Kebangsaan Malaysia (UKM) (@ The National University of Malaysia), Bangi, 43600, Selangor, Malaysia., Almohamadi H; Department of Chemical Engineering, Faculty of Engineering, Islamic University of Madinah, Madinah, 41411, Kingdom of Saudi Arabia., Alharthi NH; Department of Mechanical Engineering, Faculty of Engineering, Islamic University of Madinah, Madinah, 41411, Kingdom of Saudi Arabia.; Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh, 11421, Kingdom of Saudi Arabia., Yoshimura S; Research Center of Advanced Materials for Breakthrough Technology, Graduate School of Engineering Science, Akita University, 1-1 Tegatagakuen-machi, Akita City, 010-8502, Japan., Akhtaruzzaman M; Solar Energy Research Institute (SERI, Universiti Kebangsaan Malaysia (UKM) (@ The National University of Malaysia), Bangi, 43600, Selangor, Malaysia.; Research Center of Advanced Materials for Breakthrough Technology, Graduate School of Engineering Science, Akita University, 1-1 Tegatagakuen-machi, Akita City, 010-8502, Japan.; Graduate School of Pure and Applied Sciences, University of Tsukuba Tsukuba, Ibaraki, 305-8573, Japan.
Jazyk: angličtina
Zdroj: Chemistry, an Asian journal [Chem Asian J] 2023 Aug 06, pp. e202300532. Date of Electronic Publication: 2023 Aug 06.
DOI: 10.1002/asia.202300532
Abstrakt: This study explores a water-splitting activity using a biphasic electrodeposited electrode on nickel foam (NF). The *Ni 9 S 8 /Cu 7 S 4 /NF electrode with citric acid reduction exhibits superior OER (oxygen evolution reaction) and HER (hydrogen evolution reaction) performance with reduced overpotential and a steeper Tafel slope. The *Ni 9 S 8 /Cu 7 S 4 /NF electrode displays the ultra-low overpotential value of 212 mV for OER and 109 mV for HER at the current density of 10 mA cm -2 . The Tafel slope of 25.4 mV dec -1 for OER and 108 mV dec -1 for HER was found from that electrode. The maximum electrochemical surface area (ECSA), lowest series resistance and lowest charge transfer resistance are found in citric acid reduced electrode, showing increased electrical conductivity and quick charge transfer kinetics. Remarkably, the *Ni 9 S 8 /Cu 7 S 4 /NF electrode demonstrated excellent stability for 80 hours in pure water splitting and 20 hours in seawater splitting. The synergistic effect of using bimetallic (Cu&Ni) sulfide and enhanced electrical conductivity of the electrode are caused by reduction of metal sulfide into metallic species resulting in improved water splitting performance.
(© 2023 Wiley-VCH GmbH.)
Databáze: MEDLINE
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