Transition-metal-based NiCoS/C-dot nanoflower as a stable electrocatalyst for hydrogen evolution reaction |
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| Affiliation: | 1. Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, 431004, Maharashtra, India;2. Department of Chemistry, Savitribai Phule Pune University, Pune, 411007, Maharashtra, India;3. Department of Chemistry, Shivaji University, Kolhapur, 416004, Maharashtra, India;1. College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou, 310018, PR China;2. Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, PR China;1. Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, PR China;2. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, China;1. Department of Chemical Engineering and Applied Chemistry, Chungnam National University, 220 Gung-Dong, Yuseong-Gu, Daejeon, 305-764, Republic of Korea;2. Department of Materials Science and Engineering, Chungnam National University, 220 Gung-Dong, Yuseong-Gu, Daejeon, 305-764, Republic of Korea |
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| Abstract: | Development of highly efficient electrocatalysts to produce hydrogen has been a significant topic over the past few decades. Currently, the platinum metal group shows the best catalytic performance for the hydrogen evolution reaction (HER), but the high cost and low abundance of these materials limit their wider application. Therefore, we synthesized transition-metal-based NiCoS along with carbon dots (C-dots) as a structure-directing agent by a hydrothermal method. We also synthesized sulfur-doped NiCo, where the sulfur enhances the conductivity of the catalysts. Herein, the synthesis temperatures were changed in the range from 120 to 240 °C. Among all, NiCoS synthesized at 150 °C shows the best HER performance capabilities. In more detail, NiCoS prepared at this temperature exhibits an onset potential of 96 mV and an overpotential of 232 mV. Especially, as-prepared NiCoS nanoflower subjects to long-term stability over 20 h at a current density of 10 mA/cm2, making it a promising low-cost candidate for hydrogen production. |
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| Keywords: | NiCo alloy S-doping Carbon dots Nanoflower Transition metal Hydrogen evolution reaction |
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