Synthesis and characterisation of platinum–cobalt–manganese ternary alloy catalysts supported on carbon nanofibers: An alternative catalyst for hydrogen evolution reaction
| Autor: | Michael Brodmann, G. Marginean, Ulrich Rost, D. T. Pascal, Nicolae Vaszilcsin, Roxana Muntean |
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| Rok vydání: | 2020 |
| Předmět: |
Tafel equation
Materials science Renewable Energy Sustainability and the Environment Carbon nanofiber Alloy Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Electrolyte engineering.material Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Catalysis Fuel Technology Chemical engineering chemistry engineering 0210 nano-technology Platinum |
| Zdroj: | International Journal of Hydrogen Energy. 45:26217-26225 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.02.041 |
| Popis: | A systematic method for obtaining a novel electrode structure based on PtCoMn ternary alloy catalyst supported on graphitic carbon nanofibers (CNF) for hydrogen evolution reaction (HER) in acidic media is proposed. Ternary alloy nanoparticles (Co0.6Mn0.4 Pt), with a mean crystallite diameter under 10 nm, were electrodeposited onto a graphitic support material using a two-step pulsed deposition technique. Initially, a surface functionalisation of the carbon nanofibers is performed with the aid of oxygen plasma. Subsequently, a short galvanostatic pulse electrodeposition technique is applied. It has been demonstrated that, if pulsing current is employed, compositionally controlled PtCoMn catalysts can be achieved. Variations of metal concentration ratios in the electrolyte and main deposition parameters, such as current density and pulse shape, led to electrodes with relevant catalytic activity towards HER. The samples were further characterised using several physico-chemical methods to reveal their morphology, structure, chemical and electrochemical properties. X-ray diffraction confirms the PtCoMn alloy formation on the graphitic support and energy dispersive X-ray spectroscopy highlights the presence of the three metallic components from the alloy structure. The preliminary tests regarding the electrocatalytic activity of the developed electrodes display promising results compared to commercial Pt/C catalysts. The PtCoMn/CNF electrode exhibits a decrease in hydrogen evolution overpotential of about 250 mV at 40 mA cm−2 in acidic solution (0.5 M H2SO4) when compared to similar platinum based electrodes (Pt/CNF) and a Tafel slope of around 120 mV dec−1, indicating that HER takes place under the Volmer-Heyrovsky mechanism. |
| Databáze: | OpenAIRE |
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