Effect of the d-Band Center on the Oxygen Reduction Reaction Activity of Electrochemically Dealloyed Ordered Intermetallic Platinum–Lead (PtPb) Nanoparticles Supported on TiO2-Deposited Cup-Stacked Carbon Nanotubes
| Autor: | Toyokazu Tanabe, Fuma Ando, Takao Gunji, Shingo Kaneko, Takeo Ohsaka, Futoshi Matsumoto, Tsuyoshi Takeda |
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| Rok vydání: | 2018 |
| Předmět: |
Aqueous solution
Materials science Intermetallic chemistry.chemical_element Nanoparticle 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Electrocatalyst 01 natural sciences 0104 chemical sciences Catalysis law.invention chemistry Chemical engineering law General Materials Science 0210 nano-technology Platinum |
| Zdroj: | ACS Applied Nano Materials. 1:2844-2850 |
| ISSN: | 2574-0970 |
| DOI: | 10.1021/acsanm.8b00488 |
| Popis: | The electrocatalysis of PtPb ordered intermetallic nanoparticles (NPs)-deposited TiO2/cup-stacked carbon nanotube (PtPb NPs/TiO2/CS) catalysts for oxygen reduction reaction (ORR) was examined in 0.1 M HClO4 aqueous solution. The as-prepared catalyst exhibited only a low activity for the ORR, but its ORR activity was found to be largely enhanced by the electrochemical dealloying, i.e., by the dissolution of Pb via a repeating potential scan cycling between 0.05 and 1.1 V vs RHE at 100 mVs–1 in N2-saturated 0.1 M HClO4 aqueous solution, and to change drastically via a surface structural change of the PtPb NPs from the PtPb ordered intermetallic structure to the Pt3Pb ordered intermetallic structure and further to the Pt3Pb(core)–Pt(shell) structure with an increase in the potential scan cycling. We also found that changing the number of the potential scan cycling leads to a change in the d-band center of the resulting catalyst, and consequently, a so-called volcano-type corelationship between ORR activity a... |
| Databáze: | OpenAIRE |
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