This catalyzer shows up regularly on conspiracy theory websites and alternative energy forums. Note that Rossi claims that it is a low energy nuclear reaction and Foccardi claims that the nickel is converted to copper in the reaction. For "completely new field of science", read "pseudoscience".

I personally don't believe a word of it. There are zero credible sources for their claims. The "journal" he published in is not considered reputable. Note that the link to it from the posted article is dead. The correct link is with science replaced with physics. About half of the articles in that "journal" appear to be be about Rossi and Foccardi's nickel battery.

I also read that Rossi was involved in a massive energy scandal some years back and got charged with tax evasion and improper waste disposal.