Fuel cells work in the same way as batteries and produce electricity through a chemical reaction. Hydrogen fuel and oxygen react to produce electricity and water as byproducts. The critical problem is at the cathode, where the oxygen reduction reaction (ORR) occurs. This process relies heavily on platinum electrodes, which is a significant cost factor due to the high price of the metal. Additionally, the water formed during the reaction forms platinum hydroxide (PtOH) at the electrode, reducing efficiency.
The research team found that adding caffeine to the electrolyte significantly increased ORR activity. As with other effective methods, caffeine’s water-repellent properties help prevent PtOH formation. Caffeine also activates critical hydrogen reactions involving platinum nanoparticles, further increasing effectiveness.
The study noted an 11-fold increase in ORR activity when caffeine was added. This means a potential reduction in the amount of platinum required for electrodes, significantly reducing production costs.
Source: Ferra
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