for my lower temp demo, I now will be using mixed Ni+ Cu + Au "alloy" (reduced from a mixed solution held in C mesopores). I am not sure what it's final Debye temp is, but I expect it is much less than 0C.
D2 Date: Fri, 26 Jul 2013 12:52:38 -0400 Subject: Re: [Vo]:Defkalion/MFMP implications for electrolysis? From: [email protected] To: [email protected] Here is some complementary information. This abstract says the Debye temperature is higher when defects are present.http://onlinelibrary.wiley.com/doi/10.1002/pssa.2210090108/abstract harry On Fri, Jul 26, 2013 at 12:14 PM, DJ Cravens <[email protected]> wrote: notice you only need the >179 figure to get above the Debye temp. You can get around that by alloying the Ni with Cu and even annealing. http://books.google.com/books/about/The_Debye_Temperature_and_Hardness_of_Co.html?id=Rhd5NwAACAAJ http://onlinelibrary.wiley.com/doi/10.1002/pssa.2210090108/abstract I personally use both copper and gold in Ni to drop both the Debye temp and the energy of vacancy formation. A rough rule of thumb is that adding a softer lower melting point material to Ni or Pd is good. So far, I have to keep my metals fcc. Notice also that you can drop the energy of vacancy formation also by having finer materials. If they are small enough (somewhere around <10nm) the becomes little difference between the Ef for bulk and surface. (normally, the surface Ef is lower than the bulk) so.............. I say all that to let you know that you can have systems that work below 179 C. My demo at NI week will be operating at 80C. D2 note: the Cu added to Ni (also Pt) helps in the dissociation of the H Date: Fri, 26 Jul 2013 10:24:12 -0500 From: [email protected] To: [email protected] Subject: [Vo]:Defkalion/MFMP implications for electrolysis? With the recent corresponding findings of both Defkalion and MFMP suggesting the temperature needs to be >179C to initiate the reaction, I am wondering if this may also have implications for electrolysis with nickel. Obviously, it would be difficult to run electrolysis at a power level high enough to heat the cathode to that temperature for very long (the water would boil off). A pressurized electrolytic cell would seem to be an option. Another option would be lateral cathode pulses of high power and relatively brief duration to bring the cathode temp above >179C, but avoid boiling off the water. The trouble with this method may come in if the nickel needs to remain at >179C. This also has me wondering about two other things. 1) Brillouin Energy's method of electrolysis would seem likely to elevate the cathode temperature >179C. Could this be a factor in Godes' success? 2) Electrolytic plasma experiments with tungsten -- is the cathode temperature a key element rather than the plasma? Best regards,Jack
