Platinum-Tin (Pt-Sn, Premetek) Alloy on Carbon Black as Electrocatalysts for Electrolyzer and Fuel Cell, 0.5 g/bottle, CEFCEPtSnC
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Platinum-Tin (Pt-Sn) electrocatalysts are the "gold standard" for a very specific branch of fuel cell technology: Direct Alcohol Fuel Cells (DAFC), particularly those running on ethanol. While Pt-Co and Pt-Ni are optimized for oxygen reduction (cathode), Pt-Sn is uniquely designed for the complex chemistry of breaking down liquid fuels at the anode.
In a Direct Ethanol Fuel Cell (DEFC), Pt-Sn is the most efficient anode catalyst available. (1) Bifunctional Mechanism: Unlike hydrogen (H2), ethanol (C2H5OH) is difficult to oxidize because it creates carbon monoxide (CO) intermediates that "poison" pure platinum. Sn acts as an oxophilic site—it attracts water molecules and breaks them into hydroxyl groups (-OH) at much lower voltages than Pt. These -OH groups then "clean" the CO off the neighboring Pt atoms, converting it to CO2. (2) Breaking the C-C Bond: While it is notoriously difficult to break the carbon-carbon bond in ethanol at low temperatures, Pt-Sn (especially in a 3:1 atomic ratio) is the benchmark for achieving the highest power densities in these systems. (3) Electronic Tuning: Alloying Sn into the Pt lattice expands the Pt-Pt distance (lattice expansion). This shift in the d-band center weakens the bond between Pt and poisonous intermediates, keeping the surface "active" for longer.
| Part Number |
CEFCEPtSn31C20 |
CEFCEPtSn31C40 |
| Platinum-Tin Content |
20 wt% Pt-Sn (3:1 ratio) (16.6 wt% Pt, 3.4 wt% Sn), 80 wt% carbon black |
40 wt% Pt-Sn (3:1 ratio) (33.2 wt% Pt, 6.8 wt% Sn), 60 wt% carbon black |
| Metal Surface Area |
~100 m2/g |
~60 m2/g |
| Catalyst BET Surface Area: |
~200 m2/g |
~150 m2/g |
| Metal Crystallite Size |
2-4 nm |
4-6 nm |
| Catalyst granule size D(100) |
≤ 75 µm |
≤ 75 µm |
| Impurities |
≤ 500 ppm |
≤ 500 ppm |
| Package Size | 0.5 g/bottle | 0.5 g/bottle |
Notes: Please try to store the Pt-Sn/C powder in a dry place.
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