Platinum-Cobalt (Pt-Co, Premetek) Alloy on Carbon Black as Electrocatalysts for Electrolyzer and Fuel Cell, 0.5 g/bottle, CEFCEPtCoC
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Platinum-Cobalt (Pt-Co) is currently widely regarded as the most successful Pt-alloy electrocatalyst for commercial applications. It is the specific catalyst used in the cathode of the Toyota Mirai fuel cell stack, proving its viability for mass production.
In Proton Exchange Membrane Fuel Cell (PEMFC), Pt-Co is primarily a cathode material for the Oxygen Reduction Reaction (ORR). (1) Superior Activity: Pt-Co typically exhibits 3x to 5x higher mass activity than pure Pt/C. The cobalt atoms cause a "compressive strain" on the platinum lattice, which optimizes the distance between Pt atoms. This makes it easier for oxygen to bind, react, and release as water. (2) Geometric & Electronic Effects: The addition of Cobalt shifts the d-band center of the Platinum. This prevents oxygen-containing intermediates (like OH) from sticking too strongly to the surface, which "frees up" more active sites for new oxygen molecules. (3) Commercial Maturity: Major suppliers like TANAKA and Johnson Matthey offer Pt-Co as a standard product (e.g., 30% to 50% metal loading) because its synthesis is more reproducible at scale compared to many other alloys.
In electrolyzers, Pt-Co alloy electrocata;ysts' roles are: (1) Cathode (HER): It can be used for the Hydrogen Evolution Reaction (HER), but since pure Pt/C is already extremely efficient for HER, the performance gains from alloying with Cobalt are less significant than they are for the fuel cell's ORR. (2) Cobalt Leaching: A major risk in electrolyzer systems is the acidic environment causing Cobalt ions (Co^2+) to leach out. If these ions migrate into the proton exchange membrane, they can reduce its conductivity and lead to premature failure. (3) Solution: To mitigate this, manufacturers use acid-etching or de-alloying treatments during production. This creates a "Pt-skin" (a thick layer of pure Pt on the outside of the particle) that protects the Pt-Co alloy core from the harsh environment.
| Part Number |
CEFCEPtCo11C20 |
CEFCEPtCo31C20 |
CEFCEPtCo11C40 |
CEFCEPtCo31C40 |
CEFCEPtCo31KBC40 |
| Electrocatalyst Composition |
Highly dispersed platinum-cobalt nanoparticles Vulcan XC-72 carbon black |
Highly dispersed platinum-cobalt nanoparticles Vulcan XC-72 carbon black |
Highly dispersed platinum-cobalt nanoparticles Vulcan XC-72 carbon black |
Highly dispersed platinum-cobalt nanoparticles Vulcan XC-72 carbon black |
Highly dispersed platinum-cobalt nanoparticles Ketjen carbon black |
| Platinum-Cobalt Content |
20 wt% Pt-Co (1:1 ratio) (15.4 wt% Pt, 4.6 wt% Co), 80 wt% carbon black |
20 wt% Pt-Co (3:1 ratio) (18.2 wt% Pt, 1.8 wt% Co), 80 wt% carbon black |
40 wt% Pt-Co (1:1 ratio) (30.7 wt% Pt, 9.3 wt% Co), 60 wt% carbon black |
40 wt% Pt-Co (3:1 ratio) (36.3 wt% Pt, 3.5 wt% Co), 60 wt% carbon black |
40 wt% Pt-Co (3:1 ratio) (36.3 wt% Pt, 3.5 wt% Co), 60 wt% Ketjen black |
| Metal Surface Area |
~120 m2/g |
~90 m2/g |
~75 m2/g |
~60 m2/g |
~110 m2/g |
| Catalyst BET Surface Area: |
~200 m2/g |
~200 m2/g |
~150 m2/g |
~150 m2/g |
~480 m2/g |
| Metal Crystallite Size |
2-3 nm |
2-4 nm |
3-4 nm |
4-6 nm |
2-4 nm |
| Catalyst granule size D(100) |
≤ 75 µm |
≤ 75 µm |
≤ 75 µm |
≤ 75 µm |
≤ 75 µm |
| Impurities |
≤ 500 ppm |
≤ 500 ppm |
≤ 500 ppm |
≤ 500 µm |
≤ 500 µm |
| Package Size | 0.5 g/bottle | 0.5 g/bottle | 0.5 g/bottle | 0.5 g/bottle | 0.5 g/bottle |
Notes: Please try to store the Pt-Co/C powder in a dry place.
References:
- M. Oezaslan, et al. Oxygen Electroreduction on PtCo3, PtCo and Pt3Co Alloy Nanoparticles for Alkaline and Acidic PEM Fuel Cells, J. Electrochem. Soc.. 2012, 159 B394.
- T. Y. Yoo, et al. Scalable production of an intermetallic Pt–Co electrocatalyst for high-power proton-exchange-membrane fuel cells, Energy Environ. Sci., 2023,16, 1146-1154.