| Efficient rGO-supported CeO2–Y2O3–Nd2O3 nanocomposite electrocatalyst for water splitting (HER/OER) in alkaline medium |
| Tauseef Munawar1, Ambreen Bashir6, Khalid Mujasam Batoo2, Faisal Mukhtar6, Muhammad Shahid Nadeem6, Sajjad Hussain3, Sumaira Manzoor4, Muhammad Naeem Ashiq4, Shoukat Alim Khan5, Muammer Koc5, Faisal Iqbal6 |
1Guangzhou Institute of Energy Conversion, Chinese Academic of Sciences, No.2 Nengyuan Road, Wushan, Tianhe District, Guangzhou, 510640, China
2King Abdullah Institute for Nanotechnology, King Saud University, P.O. Box-2455, Riyadh, 11451, Saudi Arabia
3Hybrid Materials Center (HMC), Sejong University, Seoul, 05006, Republic of Korea
4Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
5Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha, 34110, Qatar
6Institute of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan |
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Received: August 11, 2023; Revised: December 23, 2023 Accepted: January 28, 2024. Published online: April 8, 2024. |
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| ABSTRACT |
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Efficient rGO-supported CeO2–Y2O3–Nd2O3 nanocomposite electrocatalyst for water splitting (HER/OER) in alkaline medium
Increasing demand for hydrogen as fuel from the electrolysis of water, along with the immense use of alternative energy strategies, is vital to meet future energy demands. Herein, we report the very first time that a quaternary composite CeO2–Y2O3–Nd2O3 modified with rGO support on nickel foam substrate demonstrated excellent catalyst behavior. Systematic structural and morphological studies are performed to understand the effects of the rare-earth-based elements on hydrogen and oxygen evolution reactions in an alkaline (1.0 M KOH) electrolyzer. X-ray photoelectron spectroscopy (XPS) analysis revealed the presence of multiple valence states, synergistic interaction, and electronic effects between the prepared nanocomposite components, resulting in excellent catalytic activity. The quaternary composite has excellent OER/HER characteristics than individual oxides with low overpotential 272 mV (OER) and 303 mV (HER) to produce standard 10 mAcm-2 current density. Moreover, the quaternary composite catalyst with more active sites also displayed a larger surface area (9.03 cm2) and double-layered capacitance (36.12 mF). The corresponding electrode is efficient and maintains its stability over 50 h toward OER/HER, which can greatly contribute to practical operation. |
| Key words:
Bifunctional electrocatalysts · Scanning transmission electron microscopy · Alkaline medium · Nickel foam · Oxygen evolution reaction · Hydrogen evolution reaction |
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