Silver/Carbon (Ag/C, Premetek) as Electrocatalysts for Electrolyzer and Fuel Cell, 0.5 g/bottle, CEFCEAgC
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Silver on Carbon (Ag/C) is a specialized electrocatalyst that has gained significant traction as a high-performance, lower-cost alternative to Platinum in specific alkaline environments. While it performs poorly in acidic PEM systems, it is a leading contender for Alkaline Exchange Membrane (AEM) technologies and CO2 electrolysis.
In alkaline media, silver becomes a highly effective catalyst for the Oxygen Reduction Reaction (ORR) at the cathode. (1) Cost-Effective Cathode: Silver is approximately 1/50th the price of Platinum. In alkaline fuel cells, Ag/C can achieve ORR activity that approaches or even matches Pt/C, making it the primary strategy for reducing the "stack cost" of fuel cells. (2) 4-Electron Pathway: While many non-Pt catalysts produce harmful peroxide (H2O2), high-quality Ag/C nanoparticles favor the efficient 4-electron pathway, converting oxygen directly into hydroxide ions (OH-). (3) Tolerance to Impurities: Ag/C is more resistant to poisoning from certain fuel impurities compared to Platinum, which can be critical when using less-than-pure hydrogen sources.
Silver is the industry standard for the Electrochemical CO2 Reduction Reaction (CO2RR). (1) Selectivity for CO: Ag/C is exceptionally good at converting CO2 into Carbon Monoxide (CO). It offers a high Faradaic Efficiency (often >90%), meaning almost all the electricity used goes into creating CO rather than wasted hydrogen. (2) Hydrogen Suppression: Silver has a high "overpotential" for the Hydrogen Evolution Reaction (HER). In the context of CO2 electrolysis, this is a major advantage because it prevents hydrogen gas from diluting the desired carbon product. (3) Morphology Matters: Research often focuses on "Ag-Nanowires" or "Ag-Flowers" on carbon supports to maximize the number of active edge sites, which are more reactive than the flat facets of the silver crystal.
| Part Number |
CEFCEAgC20 |
CEFCEAgC40 |
CEFCEAuC60 |
| Silver/Carbon Content |
20 wt% Ag, 80 wt% carbon black (Vulcan XC-72) |
40 wt% Ag, 60 wt% carbon black (Vulcan XC-72) |
60 wt% Ag, 40 wt% carbon black (Ketjen Black) |
| Metal Surface Area |
~20 m2/g |
~15 m2/g |
~10 m2/g |
| Catalyst BET Surface Area: |
~200 m2/g |
~150 m2/g |
~100 m2/g |
| Metal Crystallite Size |
~25 nm |
~35 nm |
~50 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 Ag/C powder in a dry place.
References:
- K. Seteiz, et al. Effect of Ionomer Content and Ag/C Catalyst Surface Area on the Performance of CO2 Electrolysis to CO, ACS Appl. Eng. Mater. 2024, 2, 6, 1654–1662.
- R. Vinodh, et al. Carbon supported silver (Ag/C) electrocatalysts for alkaline membrane fuel cells, J. Mater. Sci., 2012, 47, 852–859.