Electrochemically modified boron-doped diamond electrode with Pd and Pd-Sn nanoparticles for ethanol electrooxidation
| Autor: | Worawut Khunsin, John S. Foord, Michael Schmidt, Christos K. Mavrokefalos, James F. Rohan, Richard G. Compton, Maksudul Hasan, Stefan A. Maier |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
General Chemical Engineering Inorganic chemistry Nanoparticle chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry Electrochemistry 01 natural sciences Catalysis Bimetallic strip Ethanol 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Tin Electrode engineering Nanoparticles Noble metal Diamond 0210 nano-technology Palladium |
| Popis: | The modification of hydrogen terminated boron-doped diamond (HBDD) electrode with pure palladium (Pd) and Pd-Sn (tin) nanoparticles is described in this study. For synthesis of Sn/HBDD and Pd-Sn/HBDD electrode, a potentiostatic two-step electrochemical method involving the electrodeposition of Sn followed by Pd was used, respectively. The modification of the HBDD electrode with Sn and noble metal Pd by forming bimetallic Pd-Sn nanoparticle leads to a higher electrocatalytic activity. The electrocatalytic activity of the bimetallic Pd-Sn nanoparticles was evaluated towards the electrooxidation of ethanol in alkaline media and compared with that of the Pd nanoparticles alone. The bimetallic Pd-Sn nanoparticles modified HBDD electrode exhibits higher current densities and less poisoning effects during ethanol electrooxidation compared to Pd/HBDD. The proper tuning of the Pd loading on a foreign metal along with the surface termination effects of the BDD electrode plays a crucial role in achieving a high mass (4.26 × 10 6 mA/g) and specific (12.37 mA/cm 2 ) electrocatalytic activity of Pd towards ethanol electrooxidation. The aforementioned catalysts of this research possess a high poisoning resistance (I f /I b = 1.63) and stability towards ethanol electrooxidation in alkaline media. |
| Databáze: | OpenAIRE |
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