Platinum-Palladium (Pt-Pd, Premetek) Alloy on Carbon Black as Electrocatalysts for Electrolyzer and Fuel Cell, 0.5 g/bottle, CEFCEPtPdC
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Platinum-Palladium (Pt-Pd) electrocatalysts are often cited as the "best of both worlds" in noble metal alloying. While Palladium is chemically similar to Platinum (both are Group 10 metals), it is generally less expensive and offers unique protective properties when combined with Pt. The hallmark of Pt-Pd is its superior durability and anti-poisoning capabilities, making it a favorite for high-reliability fuel cell anodes and sensors.
In PEMFCs, Pt-Pd is highly effective for both the cathode and the anode, often outperforming standard Pt/C in long-term cycle life. (1) Cathode (ORR): Pt-Pd alloys (especially those with a core-shell structure where Pt forms the shell over a Pd core) can be 2x to 4x more active than pure Pt/C. The Pd core induces a lattice strain that optimizes the oxygen binding energy on the Pt surface. (2) Anode (HOR & Anti-Poisoning): Pt-Pd is significantly more resistant to poisoning by intermediates like carbon monoxide (CO). It is frequently used in Direct Formic Acid Fuel Cells (DFAFC), where it suppresses the formation of CO and forces the reaction through a more efficient direct pathway. (3) Sacrificial Protection: In many environments, Pd can act as a "sacrificial" component or help shift the dissolution potential of Platinum, preventing the Pt nanoparticles from shrinking or merging (sintering) over thousands of hours of operation.
In electrolyzers, Pt-Pd is primarily utilized at the cathode for the Hydrogen Evolution Reaction (HER). (1) Hydrogen Sorption: Palladium has a unique ability to absorb vast amounts of hydrogen into its own crystal lattice. When alloyed with Platinum, this can facilitate faster hydrogen gas release and lower the energy required for the reaction (overpotential). (2) Alkaline Electrolysis: While Pt is the gold standard in acid, Pt-Pd alloys often show even better performance in alkaline water electrolysis (AWE) or Anion Exchange Membrane (AEM) systems, where pure Pt can sometimes struggle with water dissociation steps.
| Part Number |
CEFCEPtPd13C20 |
CEFCEPtPd11C20 |
CEFCEPtPd31C20 |
| Platinum-Palladium Content |
20 wt% Pt-Pd (1:3 ratio) (7.6 wt% Pt, 12.4 wt% Pd), 80 wt% carbon black (Vulcan XC-72) |
20 wt% Pt-Pd (1:1 ratio) (12.9 wt% Pt, 7.1 wt% Pd), 80 wt% carbon black (Vulcan XC-72) |
20 wt% Pt-Pd (3:1 ratio) (16.9 wt% Pt, 3.1 wt% Ru), 80 wt% carbon black (Vulcan XC-72) |
| Metal Surface Area |
~100 m2/g |
~100 m2/g |
~100 m2/g |
| Catalyst BET Surface Area: |
~200 m2/g |
~200 m2/g |
~200 m2/g |
| Metal Crystallite Size |
2-4 nm |
2-4 nm |
2-4 nm |
| Catalyst granule size D(100) |
≤ 75 µm |
≤ 75 µm |
≤ 75 µm |
| Impurities |
≤ 500 ppm |
≤ 500 ppm |
≤ 500 ppm |
| Package Size | 0.5 g/bottle | 0.5 g/bottle | 0.5 g/bottle |
Notes: Please try to store the Pt-Pd/C powder in a dry place.
References:
- S. Nogami, et al. Highly Selective and Efficient Electrocatalytic Semihydrogenation of Diphenylacetylene in a PEM Reactor with Pt–Pd Alloy Cathode Catalysts, J. Electrochem. Soc., 2020, 167, 155506.
- S. Thanasilp, et al. Effect of Pt: Pd atomic ratio in Pt–Pd/C electrocatalyst-coated membrane on the electrocatalytic activity of ORR in PEM fuel cells, Renewable Energy, 2011, 36, 1795-1801.