MoS2-supported on free-standing TiO2-nanotubes for efficient hydrogen evolution reaction |
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| Affiliation: | 1. Department of Chemical Engineering, Alagappa College of Technology, Anna University, Chennai 600025, Tamil Nadu, India;2. Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India;1. College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao, 266109, People''s Republic of China;2. Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling, Shanxi, 712100, People''s Republic of China;1. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry (Ministry of Education), College of Chemistry & Materials science, Northwest University, Xi’an 710127, PR China;2. National Key Laboratory of Photoelectric Technology and Functional Materials (Culture Base), National Photoelectric Technology and Functional Materials & Application International Cooperation Base, Institute of Photonics & Photon-Technology, Northwest University, Xi’an 710069, PR China;1. ??rnak University, Faculty of Engineering, Department of Mechanical Engineering, Turkey;2. ??rnak University, Faculty of Engineering, Department of Electric and Electronic Engineering, Turkey;3. ??rnak University, Faculty of Engineering, Department of Energy Systems Engineering, 73000, ??rnak, Turkey |
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| Abstract: | The electrochemical production of hydrogen is a promising and flexible approach towards the conversion of intermittent renewable energy sources into clean chemical fuel. However, low-cost, efficient, and durable electrocatalysts are yet to be developed to attain economies of scale in hydrogen generation. In this study, we fabricated highly ordered free-standing TiO2 nanotube arrays (TiO2-NTs), by simply anodizing Ti foils. The tube length, diameter, wall thickness, and surface structure of the TiO2-NTs can be controlled by adjusting the anodization conditions. Subsequently, we synthesized and supported MoS2 layers on free-standing TiO2-NTs as an active material for the hydrogen evolution reaction (HER), using a slow evaporation method. The layers of MoS2 uniformly disperse on the entire surface of the TiO2-NTs composite. The electrochemical test shows that the MoS2-supported free-standing (MoS2/TiO2-NTs) system exhibits excellent HER performance in acidic media with a low overpotential at 10 mA cm?2 (170 mV), as well as small Tafel slope (70 mV decade?1). Also, the MoS2/TiO2-NTs displays superior durability for HER after 5000 continuous potential cycles between ?0.4 and + 0.2 (V vs. RHE). Our results demonstrate the potential application of MoS2/TiO2-NTs composite for cost-effective electrochemical production of hydrogen. |
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