The physical properties of H2 ad D2, including diffusion, are very different. so it is not at all surprising that ATER and hence CCS should be very different between H2 and D2.
For ATER there may be merit in this explanation.
I guess D2 being heavier would diffuse a bit slower than H2 in palladium.
This could explain why with deuterium you might get much lesser hypothetical ATER than with H2 because by common sense there would be less
deuterium to combine.. but I guess it really does need experimentation, since its only a theory.
Its unfortunate that Kirkshanahan had no access to any electrochemical apparatus since2005
in the Savannah River DOE laboratories.to test his theory out since 2005.
His paper talked about Szpak codeposition electrodes
but perhaps ATER effect could also be seen with the simpler Fleischmann electrodes.
I will reread the 2005 paper to check this.
For CCS on the other hand whether or not H2 or D2 are present does not seem to be a factor.
that's from my reading of the 2002 paper.
Interesting stuff.. the things electrochemists must know is amazing.