What might be the 'secret additional element' in Rossi's latest reactor
In reference to discussion here
As I said in my first trip to India in 2017, desirable element choices for effective LENR reactors IMPO would be either any element that has the lowest ionisation energy or Carbon - this is because all of the primary effects are due electrons and their analogues and secondary effects need to withstand high temperatures and possibly yield more energy from proton (or possibly other positive ions) interactions that are safe in their yield products.
An element with the lowest ionisation energy in order to easily release free electrons, for solids/liquids, this would be practically potassium, as the marginally lower Rb & Cs etc are difficult to handle and expensive. For gasses, you would choose Xenon as Radium is radioactive. For transition metals, you would choose Sc, Ti, V in that order. Ti is a good compromise as it is a great store of H2 and so can perform multiple roles. It, and some other choices have however, their own challenges that I will expand on later.
Carbon, since it has many forms and has the highest melting point (3500ºC). Where there are protons of sufficient velocity or with sufficient charge screening / negation, it can act as a catalyst taking part in the CNO cycle as I said many years ago when I suggested that the 'C' in NiCHEnergy might refer to the addition of Carbon to a Ni and Hydrogen system. I repeated my hypothesis for C+4H CNO cycles importance last week with further context.
These are raw elements and so cannot be patented.
They are not needed in order to gain excess from a Shoulders type, quadrupole contained plasma focus type device. They may also not be needed in other LENR reactors to see excess - they are promoters of a key driver (production of free electrons) and safe yield enhancement ( safe use of protons / other positive ions ).