rationalskepticism.org

... When hydrogen atoms come in contact with the metal (Ni), they abandon their stationary state as they deposit their electrons in the conductivity band of the metal, and due to their greatly reduced volume, compared to that of their atom, the hydrogen nuclei (naked protons) readily diffuse into the defects of the nickel crystalline structure as well as in tetrahedral or octahedral void spaces of the crystal lattice. ...