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Intriguing Catalytic Activity of Surface Active Gold-Platinum Islands on Nano-Porous Au in Determining Efficient Direct Formic Acid Oxidation Pathway
- Source :
- ChemistrySelect. 2:3562-3571
- Publication Year :
- 2017
- Publisher :
- Wiley, 2017.
-
Abstract
- Gold-platinum nano-porous structures (Au100-xPtx NPoS) with unique surface enriched Au−Pt islands are synthesised through a galvanic replacement strategy from Au100-xAg2x nano-alloys with ultra-low platinum loading (x=1.25, 2.5 and 5). Formic acid oxidation reaction (FAOR) on Au100-xPtx/C NPoS shows a distinct peak at around 0.5 V related to CO2 formation. A characteristic peak at around 1.5 V increases with increasing FA concentration owing to the direct FAOR by nano-porous Au centers. FAOR peaks and If/Ib peak current ratios indicates that, Au100-xPtx/C NPoS facilitates direct FAOR pathway unlike HiSPEC Pt/C (dehydration pathway). Based on the enhanced chrono-amperometric response, Tafel behaviour and mass activity values, Au97.5Pt2.5/C NPoS (5.5 A/mgPt) reflects as the optimal catalyst for efficient FAOR. The intriguing catalytic role of surface enriched Au−Pt islands present on nano-porous Au greatly helps in determining the superior FAOR activity in Au97.5Pt2.5/C NPoS towards direct dehydrogenation pathway at ultra-low Pt content compared to other NPoS and HiSPEC Pt/C catalysts.
- Subjects :
- Tafel equation
Inorganic chemistry
chemistry.chemical_element
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
Formic acid oxidation
0104 chemical sciences
Catalysis
Nano porous
chemistry
Galvanic cell
Dehydrogenation
0210 nano-technology
Platinum
Subjects
Details
- ISSN :
- 23656549
- Volume :
- 2
- Database :
- OpenAIRE
- Journal :
- ChemistrySelect
- Accession number :
- edsair.doi...........2ddc5d757a95d03ec0d058339b08461b