| Facile synthesis of strontium selenide supported copper sulfide hybrid nanosheets as an efficient electrode for high-performance OER |
Ali Junaid1, Muhammad Abdullah2, Nigarish Bano1, Faiqa Noreen1, Syed Imran Abbas Shah1, Razan A. Alshgari1, Saikh Mohammad3, Sumaira Manzoor1, Muhammad Fahad Ehsan4, Muhammad Naeem Ashiq1
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1Institute of Chemical Sciences, Bahauddin Zakariya University, Multan 60800, Pakistan
2Department of Chemistry, Government College University, Lahore, Pakistan
3Department of Chemistry, College of Science, King Saud University, 11451 Riyadh, Saudi Arabia
4Department of Civil and Environmental Engineering, Northeastern University, Boston 02115 MA, USA |
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Received: November 8, 2023; Revised: January 3, 2024 Accepted: January 5, 2024. Published online: February 22, 2024. |
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| ABSTRACT |
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To drive clean and sustainable fuel production via water electrolysis, development of high-performing, cost-effective electrocatalysts rich in earth elements without relying on precious metals or costly materials is crucial. In this study, strontium selenide (SrSe), copper sulfide (CuS), and composite SrSe@CuS via a traditional coprecipitate method under alkaline conditions are synthesized. Characterization techniques including X-ray diffraction, Transmission electron microscopy, Field emission scanning electron microscopy, and Brunauer–Emmett–Teller surface area analysis are employed to analyze the structure, morphology, and surface characteristics. The larger surface area of 123 m2 g−1 and lower crystalline size (46.43 nm) of SrSe@CuS nanosheets show more active sites for oxygen evolution reaction. The oxygen evolution activity displayed overpotentials of 290 mV, a lower tafel slope of 67 mV dec−1, and Lower charge transfer resistance (RCT) values of SrSe@ CuS nanosheets (1.82 Ω) surpassing the individual SrSe and CuS nanosheets. Notably, the SrSe@CuS nanosheets exhibited remarkable stability, maintaining an oxygen evolution reaction (OER) activity of 10 mA cm−2 for over 50 h and sustaining a negligible loss in performance even after 50,000 cycles of repetitive cyclivoltammetry scans. These findings highlight their potential applicability in energy conversion and storage systems. |
| Key words:
Metal chalcogens · Metallic sulfide and selenides · Electrochemical water splitting · Oxygen evolution reaction (OER) |
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