While looking for references for a related discussion, today I found this open access peer-reviewed paper (published on International Journal of Modern Physics B) by Jacques Dufour et al describing a "hot-tube" experiment with iron and sodium. I don't recall it being linked before in the LENR blogosphere, even though it should be related with LENR-like phenomena. The paper itself makes no mention of "LENR" nor "cold fusion", but as far as I am aware of the results have been discussed in various LENR meetings; Dufour is a known researcher in the field. This paper was originally published in August 2017.
Jacques Dufour, Xavier Dufour, Fabienne Dioury, Jenny D. Vinko
Abstract: Chemical reactions result from the outside shell electrons of the reacting species being shared in various types of combinations. Typical distances involved are tenths of nm, resulting in binding energies typically in the order of hundreds of kJ/mole (eV/atom). The synthesis of a novel “atomic system” formed from Iron and di-Hydrogen has been achieved. The measured enthalpy of formation is some 40 MJ/mole Fe and the distance between the hydrogen proton and the iron nucleus is some 8 pm, hence the proposed name: Iron Pico-Hydride. This compound is a permanent electric dipole of atomic size. Pico-Hydrides could, thus, play a significant role in HT superconductivity and in super-capacitors. The synthesis is compatible with the standard model.
The paper is open access, thus freely downloadable.