Crystalline and porous CoSe dendrimeric architectures for efficient oxygen evolution reaction. (1st September 2022)

• Record Type: Journal Article
• Authors: Bilal, Muhammad; Rashid, ; Altaf, Amna; Baig, Nadeem; Chotana, Ghayoor Abbas; Ashraf, Raja Shahid; Rasul, Shahid; Nafady, Ayman; Ul-Hamid, Anwar; Sohail, Manzar
• Is Part Of: Fuel. Volume 323(2022)
• Publication Date: 2022-09-01
• Subjects: CoSe -- Electrocatalyst -- Oxygen evolution reaction -- Water splitting -- Renewable energy; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.124324
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: Synthesis of CoSe nanostructures by a facile one-step hydrothermal method. Optimization of the synthesis conditions to obtain the best results. A low overpotential of 250 mV and high current density was achieved. Excellent stability of CoSe under oxidative conditions was observed. Abstract: Developing an efficient and economical electrocatalyst for oxygen evolution reaction is the key challenge to renewable energy technologies. Metal selenides are attractive candidates for electrocatalytic water oxidation because they provide suitable surface-active sites for the reaction. Herein, we report less explored hexagonal cobalt selenide (CoSe) preparation for oxygen evolution reaction through the facile and environmentally benign one-step hydrothermal method. Reaction conditions were precisely tailored to develop highly crystalline and porous dendrimeric architectures of CoSe. Owing to its exclusive porous and dendrimeric crystalline network and large electrochemical surface area, the superior CoSe electrocatalyst (that is 16H) showed excellent electrochemical activity with remarkably low overpotential (250 mV at 10 mA cm −2 ) and very high current density (570 mA cm −2 ) in a small potential window. The Tafel slope of 16H sample was 56 mV dec −1, indicating the faster kinetics at the catalyst surfaces. Moreover, it also showed excellent stability under harsh oxidative conditions in a 24-hour long stability test experiment.