| Development of Se-doped Mn0.5Cd0.5S nanoparticles: an efficient dual-nature electrocatalysts for HER/OER in an alkaline electrolyte |
Iqra Shahin1, Ambreen Bashir1, Mohammed Mujahid Alam2, Tauseef Munawar3, Mohamed Mohamed2, Abhinav Kumar4,5,8, Muhammad Sufyan Naeem1, Muhammad Rafaqat3,6, Shoukat Alim Khan7, Muammer Koc7, Chang-Feng Yan3,6, Faisal Iqbal1
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1Institute of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan
2Department of Chemistry, College of Science, King Khalid University, P. O. Box 9004, 61413, Abha, Saudi Arabia
3Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, No. 2 Nengyuan Road, Wushan, Tianhe, Guangzhou, 510640, China
4Department of Nuclear and Renewable Energy, Ural Federal University Named after the First President of Russia Boris Yeltsin, Ekaterinburg, 620002, Russia
5Centre for Research Impact & Outcome, Chitkara University Institute of Engineering and Technology, Chitkara University, Rajpura, 140401, India
6University of Science and Technology of China, Hefei, 230026, China
7Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha, Qatar
8Department of Mechanical Engineering and Renewable Energy, Technical Engineering College, The Islamic University, Najaf, Iraq |
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Received: November 19, 2024; Revised: March 23, 2025 Accepted: April 14, 2025. Published online: May 7, 2025. |
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| ABSTRACT |
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Water electrolysis is a significant energy conversion strategy to generate sustainable and clean hydrogen and a practical approach to solving the world energy crisis. This technique demands eco-friendly, efficient, highly active catalysts for anodic and cathodic reactions, e.g., OER and HER. Transition metal sulfide-based catalysts have been widely explored as potential bifunctional electrocatalysts for water splitting. MnS-based catalysts are extensively attracted due to their diverse polyvalence nature, but, unfortunately, pure MnS-based catalysts have undesirable conductivity. We adopt heteroatom doping to accelerate the active site and improve conductivity. The Se-MnCdS nanoparticles-based electrocatalyst was synthesized on the stainless-steel substrate via the facile hydrothermal treatment. The chemical and physical techniques of the developed working electrode (Se-Mn0.5Cd0.5S) were ascertained through the XRD, IV, XPS, TEM, and EDX techniques. Therefore, Se doping in Mn0.5Cd0.5S effectively increases electrochemical performances and enhances electronic conductivity, as confirmed via experimental and systematic analysis. By optimizing the as-synthesized catalyst, the required over-potential for OER was only 276 mV, and for HER, 101 mV at benchmark current density (10 mAcm-2) in an alkaline medium. Also, low Tafel values for both reactions, such as for OER, 55 mVdec-1, and 31 mVdec-1 for HER, were observed. More than that, the Se-doped catalyst demonstrates long-term electrocatalytic stability during constant operation for 43 h for the OER and 34 h for HER in 1 M KOH solution. Consequently, our doping technique outcomes demonstrate the enhanced intrinsic and extrinsic electrocatalytic activity, and this work also allows a new avenue for synthesizing efficient dual-nature electrocatalysts for water electrolysis. |
| Key words:
Abundant active sites · HER · Nanoparticles · OER · Stainless-steel substrate · Se-doped Bi-metallic sulfide |
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