The recipe for ink preparation for activated carbon and activated carbon loaded with metal to be drop casted on nickel foam will depend on the specific application and requirements. However, here is a general recipe for ink preparation that can be used as a starting point:

Ingredients:

• Activated carbon or activated carbon loaded with metal (e.g. platinum, palladium)
• Binder material (e.g. polyvinylidene fluoride (PVDF), carboxymethyl cellulose (CMC))
• Solvent (e.g. N-methyl-2-pyrrolidone (NMP), ethanol)

Instructions:

Note: The specific amount of each ingredient and the mixing procedure may need to be adjusted based on the specific application and the properties of the activated carbon or activated carbon loaded with metal being used. It is recommended to experiment with different ink formulations and parameters to optimize the performance of the ink for the specific application.