Novel electrocatalysts for hydrogen evolution based on carbon fibers modified by cobalt phosphides
| Autor: | R. Orinakova, Alexandra Bekényiová, Magdaléna Strečková, Ján Dusza, Vladimír Girman, A. Guboova, Erika Mudra, Jana Hovancová, M. Heckova, Zuzana Danková |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
General Physics and Astronomy Nanoparticle chemistry.chemical_element 02 engineering and technology Carbon nanotube 010402 general chemistry 01 natural sciences Oxalate law.invention chemistry.chemical_compound law Specific surface area Phosphoric acid Tafel equation Polyacrylonitrile Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films chemistry Chemical engineering 0210 nano-technology Cobalt |
| Zdroj: | Applied Surface Science. 507:144927 |
| ISSN: | 0169-4332 |
| Popis: | Carbon modified fibers as potential electrocatalysts for hydrogen evolution reaction (HER) were prepared using needle-less spinning technology (NLE). The spinned solution was composed of polyacrylonitrile (PAN), polyvinylpyrrolidone (PVP), natrium dodecylsulphate (SDS), phosphoric acid (H3PO4) and two different cobalt salts: cobalt nitrate hexahydrate (Co(NO3)2·6H2O) or cobalt(II) oxalate dihydrate (C2H4CoO3). Each of these components has an indispensable role in the formation of continuous porous fibers doped by Co2P nanoparticles for HER. The structural and morphological characterizations were studied by XRD, BET, SEM and TEM techniques. The specific surface area of the fibers increased rapidly with increasing content of Co2P nanoparticles in the carbon matrix. The usage of nitrate cobalt salts led to the formation of large quantities of multi-walled carbon nanotubes (MWCNTs) perpendicular to the carbon matrix. Tip growth mechanism was suggested for an emergence of MWCNTs. The highest electrochemical activity for HER performance was found in the fibres containing the highest amount of Co2P nanoparticles, which provided the current density of 10 mA cm−2 at η10 −300 mV. The smaller Tafel slope and fastest HER kinetics were found in the samples with highest content of Co2P nanoparticles and highest specific surface area. |
| Databáze: | OpenAIRE |
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