N-doped graphene supporting Pd-based binary and ternary alloys as cathode catalysts for direct ethanol fuel cells
| Autor: | Theeraporn Promanan, Thapanee Sarakonsri, Siwat Thungpraserta |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Scanning electron microscope Graphene Alloy 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Cathode law.invention Catalysis Sodium borohydride chemistry.chemical_compound chemistry Chemical engineering law Transmission electron microscopy 0103 physical sciences engineering 0210 nano-technology Ternary operation |
| Zdroj: | Materials Today: Proceedings. 17:1332-1343 |
| ISSN: | 2214-7853 |
| DOI: | 10.1016/j.matpr.2019.06.151 |
| Popis: | Binary and ternary alloys of PdNi, PdCo, PdCu and PdNiCo on Nitrogen-doped graphene (N-doped graphene) supporter, which prepared by modified Hummers method, were prepared via solution route using sodium borohydride (NaBH4) as a reducing agent, microwave-assisted and polyol methods to improve the activity of oxygen reduction reaction (ORR) in direct ethanol fuel cells (DEFC). The X-ray diffraction (XRD) results confirm the formation of Pd alloy nanocatalyst phases. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images of as prepared catalysts show that alloy catalysts are well dispersed on N-doped graphene. Particle size measured from TEM micrographs are in the range of 4-11 nm. This provided large active surface area for ORR. The small particles of the ternary PdNiCo alloy catalysts on N-doped graphene prepared via NaBH4 reduction method showed the highest power density of 224.6 mW/cm2.mol for fuel cells. Therefore, these PdNiCo on N-doped graphene migh be good catalysts for use as next generation cathode materials in DEFC. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect