Jed, steps 1 - 6 (after cleaning) do not include the presence of Deuterium gas which is required to reduce any remaining nickel oxide into pure Nickel and D2O at raised temperature.
Oops. We should have made it clear that deuterium gas is the only thing that goes into the cell after it is pumped out the first time. He never heats it in air again. In some of the other tests it was hydrogen, but never air. So D2O or H2O are removed.
It is highly purified D2 or H2 gas. Air has all kinds of contaminants. Plus more water, obviously.
I should perhaps patch up the paper to mention that. I should also add the source of the Pd rod. I am making a list of things that need changing in the paper. I am going to let it sit for a week or two before making any changes. Both Mizuno & I are exhausted. The time difference means I have been late for many days.