This fits with the historical tidbits Rossi has mentioned....that he first discovered (or re-discovered) the anomalous excess heat with just hydrogen and nickel.
For anyone interested in the technical end, I compiled an energy balance worksheet. It’s difficult to determine from comments by various personalities, how much nickel is consumed per unit energy released with any great confidence.
It’s not necessary to know the reaction paths or means in order to do this, assuming that Ni transmuted is Cu.
I obtain an energy density figure about 10.1 times that which is reported.
Would anyone like to check my work?