Crystalline and porous CoSe dendrimeric architectures for efficient oxygen evolution reaction

Muhammad Bilal, Rashid, Amna Altaf, Nadeem Baig, Ghayoor Abbas Chotana, Raja Shahid Ashraf, Shahid Rasul, Ayman Nafady, Anwar Ul-Hamid, Manzar Sohail*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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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.

Original languageEnglish
Article number124324
Number of pages8
Early online date26 Apr 2022
Publication statusPublished - 1 Sept 2022


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