Enhanced catalysis of the electrochemical hydrogen evolution reaction using composites of molybdenum-based compounds, gold nanoparticles and carbon
| Autor: | Souradip Malkhandi, Jing Lee, Cristina Giordano, Boon Siang Yeo, Ubisha Joshi |
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| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Inorganic chemistry General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Carbon black 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Catalysis Metal Molybdenum Colloidal gold visual_art ddc:540 Linear sweep voltammetry visual_art.visual_art_medium Physical and Theoretical Chemistry Composite material 0210 nano-technology Carbon |
| Zdroj: | Physical Chemistry Chemical Physics. 18:21548-21553 |
| ISSN: | 1463-9084 1463-9076 |
| Popis: | Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich. This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively. Molybdenum nitride has been recently reported to interact synergistically with gold to show an enhanced activity for the electrochemical hydrogen evolution reaction (2H(+) + 2e(-) -> H-2, HER). In this work, we elucidated the roles of nitrogen, carbon, molybdenum and gold on this observed phenomenon. Composites of Mo-based compounds, carbon black (black pearl 2000) and/or Au nanoparticles (Au-NP) were prepared, and their activities for the HER in a 0.5 M H2SO4 electrolyte were measured using linear sweep voltammetry. We show and discuss here for the first time that, while the presence of carbon is necessary for the synergy phenomenon, the nitrogen atoms present in the compounds play no apparent role in this synergy. In fact, all the compounds containing Mo, namely Mo2N, MoB and metallic Mo-0, exhibited extensive synergy with Au for the HER. A hypothesis for the enhanced catalysis of H-2 evolution by the mixed metal composites is proposed and discussed. |
| Databáze: | OpenAIRE |
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