http://www.sciencedaily.com/releases/2008/12/081219172129.htm
http://tinyurl.com/9a648rExcess energy available from various reactions, including Ti + p and Ti+ D. It would be interesting to test this material in powdered and thin film form, though high tunneling rates probably have to be maintained via thermal gradients and pressure gradients, which are easier to maintain in bulk volumes.
Best regards, Horace Heffner http://www.mtaonline.net/~hheffner/