Not sure if this has been posted before.. yet another theory
Hydrogen and deuterium isotope effects beyond the electromagnetic force
Article in International Journal of Hydrogen Energy · September 2018
https://www.sciencedirect.com/…0319918327939?via%3Dihub#!
PdD electrolysis yields heat, 3H, and 4He resulting from several isotope effects.
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Upon electrolysis, the D2 released into the lattice captures an electron to form a di-neutron.
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The di-neutron undergoes a nuclear reaction with protic impurity to form 3H.
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The di-neutron joins with deuterium yielding 4mH with internal conversion to 4He.
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The process includes non-linear dynamics from phonon assisted tunneling.