Highly active and durable nanostructured molybdenum carbide electrocatalysts for hydrogen production
| Autor: | Chiu Hui Wang, James T. Muckerman, Nebojsa Marinkovic, Y. Zhu, Wenqian Xu, Radoslav R. Adzic, Wei-Fu Chen, Kotaro Sasaki |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Electrolysis of water Renewable Energy Sustainability and the Environment Inorganic chemistry chemistry.chemical_element Carbon nanotube Carbon black Overpotential Pollution Catalysis law.invention Thermogravimetry Nuclear Energy and Engineering chemistry law Environmental Chemistry Carbon Hydrogen production |
| Zdroj: | Energy & Environmental Science. 6:943 |
| ISSN: | 1754-5706 1754-5692 |
| DOI: | 10.1039/c2ee23891h |
| Popis: | In an attempt to tailor low-cost, precious-metal-free electrocatalysts for water electrolysis in acid, molybdenum carbide (β-Mo2C) nanoparticles are prepared by in situ carburization of ammonium molybdate on carbon nanotubes and XC-72R carbon black without using any gaseous carbon source. The formation of Mo2C is investigated by thermogravimetry and in situ X-ray diffraction. X-ray absorption analysis reveals that Mo2C nanoparticles are inlaid or anchored into the carbon supports, and the electronic modification makes the surface exhibit a relatively moderate Mo–H bond strength. It is found that carbon nanotube-supported Mo2C showed superior electrocatalytic activity and stability in the hydrogen evolution reaction (HER) compared to the bulk Mo2C. An overpotential of 63 mV for driving 1 mA cm−2 of current density was measured for the nanotube-supported Mo2C catalysts; this exceeds the activity of analogous Mo2C catalysts. The enhanced electrochemical activity is facilitated by unique effects of the anchored structure coupled with the electronic modification. |
| Databáze: | OpenAIRE |
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