Platinum-Chromium (Pt-Cr, Premetek) Alloy on Carbon Black as Electrocatalysts for Electrolyzer and Fuel Cell, 0.5 g/bottle, CEFCEPtCrC
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Platinum-Chromium (Pt-Cr) electrocatalysts are a specialized class of materials often chosen for their exceptional stability and specific electronic properties. While Pt-Co and Pt-Ni dominate the "highest activity" headlines, Pt-Cr is frequently favored in long-term durability studies and specific aerospace or heavy-duty applications.
In fuel cells, Pt-Cr is primarily used at the cathode for the Oxygen Reduction Reaction (ORR). (1) Electronic Modification: Like other 3d transition metals, Chromium modifies the platinum lattice. It contracts the Pt-Pt bond distance (strain effect) and shifts the d-band center. This reduces the binding energy of oxygen intermediates (OH*), preventing the platinum surface from becoming "blocked" and allowing the reaction to proceed faster than on pure Pt/C. (2) Corrosion Resistance: Chromium is known for its ability to form a very stable, thin protective oxide layer. In the harsh, acidic, and high-voltage environment of a fuel cell cathode, Pt-Cr often shows better resistance to "metal leaching" than Pt-Ni or Pt-Cu. (3) Activity vs. Durability: While its peak activity might be slightly lower than Pt-Ni, its retention of activity over thousands of voltage cycles is often superior. This makes it a strong candidate for heavy-duty vehicles (trucks/buses) where the stack must last 20,000+ hours.
| Part Number |
CEFCEPtCr31C20 |
CEFCEPtCr31C40 |
| Platinum-Chromium Content |
20 wt% Pt-Cr (3:1 ratio) (18.4 wt% Pt, 1.6 wt% Cr), 80 wt% carbon black |
40 wt% Pt-Cr (3:1 ratio) (36.7 wt% Pt, 3.3 wt% Cr), 60 wt% carbon black |
| Metal Surface Area |
~90 m2/g |
~75 m2/g |
| Catalyst BET Surface Area: |
~200 m2/g |
~150 m2/g |
| Metal Crystallite Size |
2-4 nm |
3-5 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-Cr/C powder in a dry place.
References:
- H. Yang, et al. Tailoring, Structure, and Activity of Carbon-Supported Nanosized Pt−Cr Alloy Electrocatalysts for Oxygen Reduction in Pure and Methanol-Containing Electrolytes, J. Phys. Chem. B 2004, 108, 6, 1938–1947.
- H. Yang, et al. High Methanol Tolerance of Carbon-Supported Pt-Cr Alloy Nanoparticle Electrocatalysts for Oxygen Reduction, J. Electrochem. Soc., 2005,152 A704.