Enhanced Mass Activity and Stability of Bimetallic Pd-Ni Nanoparticles on Boron-Doped Diamond for Direct Ethanol Fuel Cell Applications
| Autor: | James F. Rohan, Christos K. Mavrokefalos, Maksudul Hasan, John S. Foord |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Analytical chemistry chemistry.chemical_element Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry Electrocatalyst 01 natural sciences Catalysis chemistry.chemical_compound Nickel Electrochemistry Bimetallic strip Ethanol Fuel cell Diamond 021001 nanoscience & nanotechnology Direct-ethanol fuel cell 0104 chemical sciences Chemical engineering chemistry engineering Nanoparticles 0210 nano-technology Palladium |
| Zdroj: | ChemElectroChem. 5:455-463 |
| ISSN: | 2196-0216 |
| Popis: | In this work, electrochemical deposition of Pd (palladium) and bimetallic Pd-Ni (nickel) nanoparticles on oxygen-terminated boron-doped diamond (BDD) substrate is described for use as electrocatalyst in direct ethanol fuel cell. A potentiostatic two-step electrochemical method involving the electrodeposition of Ni nanoparticles on BDD followed by mono-dispersed Pd nanoparticles was used for the fabrication of Pd-Ni/BDD electrode. The electrocatalytic activity of the bimetallic Pd-Ni nanoparticles was evaluated in an alkaline solution containing ethanol and compared to that of the Pd nanoparticles alone. The bimetallic Pd-Ni nanoparticles showed 2.4 times higher mass activity than the similar systems from literature as well as stability when operated in alkaline media. Higher electrochemical response towards the electrooxidation of ethanol observed for the bimetallic electrocatalysts was due to the synergistic effects of the electron interaction at the interface of the two metals. Chronopotentiometric measurements revealed that Pd is more stable when anchored to the Ni nanoparticles. The optimised loading of mono-dispersed Pd on a foreign Ni metal as nanoparticles plays a crucial role in achieving a high mass (3.63 x 106 mA/g) and specific (10.53 mA/cm2) electrocatalytic activity of Pd towards ethanol electrooxidation in alkaline media. |
| Databáze: | OpenAIRE |
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