| Craved Ni3S2–Sm2O3 heterojunction with enhanced electrocatalytic stability and oxygen evolution reaction |
Razan A. Alshgari1, Jafar Hussain Shah2, Saikh Mohammad1, Ome Parkash Kumar3, Abdul Ghafoor Abid4
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1Department of Chemistry, College of Science, King Saud University, 11451 Riyadh, Saudi Arabia
2Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China
3Institute of Chemistry, The Islamia University of Bahawalpur, Baghdad Campus, Bahawalpur 63100, Pakistan
4Institute of Chemical Sciences, Bahauddin Zakariya University, Multan 60800, Pakistan |
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Received: November 25, 2024; Revised: April 16, 2024 Accepted: May 13, 2024. Published online: June 7, 2024. |
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| ABSTRACT |
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The search for stable, affordable, and active electrocatalysts that can efficiently produce hydrogen by water splitting is imperative to transition energy systems especially away from fossil fuels to a contemporary one. Herein, Ni3S2 integrated Sm2O3 composite (Ni3S2–Sm2O3) is produced by on nickel foam (NF) support espousing hydrothermal technique. All the pristine and composite materials including, Ni3S2, Sm2O3 and Ni3S2–Sm2O3 are explored for oxygen evolution reaction (OER). Amongst these, Ni3S2–Sm2O3 displayed an extraordinarily higher oxygen evolution activity at an overpotential of 225 mV and Tafel slope of 63 mV dec−1 a current density of 50 mA cm−2 is obtained. The pore volume and surface area of all the samples have been recorded using Brunauer–Emmett–Teller (BET). The optimized Ni3S2–Sm2O3 showed a higher surface area of 222 m2 g−1 which is higher compared with pristine Ni3S2 and Sm2O3. To elucidate morphological attributes of samples by scanning electron microscopy (SEM) and Transmission electron microscopy (TEM). The composite material Ni3S2–Sm2O3 demonstrated highly porous structures compared with pure materials. The boosted OER activity is related to the fast migration of charges, extraordinary stability and porous structure. The post-characterization of the produced electrode showed that the development of an oxide/oxyhydroxide layer on the surface of the catalyst supports continued outstanding OER activity. |
| Key words:
Hydrogen energy · Oxygen evolution reaction · Ni3S2–Sm2O3 · Nanocomposite · Alkaline medium |
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