Posted Earlier:
>
> The 4.6 eV work function of Nickel is close to the 4.52 eV
> work function of Tungsten, but the Amp/Meter^2/Deg^2
> is half the 6.0E5 for Tungsten.
> OTOH, with a Helmholtz Double Layer Zeta Potential
> of 0.125 volts at the Water-Nickel Interface. which is comparable
> to a Boltzman temperature of 1450 K based 11600 K/eV.
> IOW with the right surface conditions of the metal "cold
> electron donation" of the metal to the H3O+ or H+ is
> possible. Likewise for the donation of the OH- electron
> to the image charge on the Nickel Anode especially if
> the electrodes are "pre-biased" using Contact Potential
> (about 0.21 volts for Iron-Nickel or Copper-Nickel 0.3 volts).
>
According to the Dushman equation J = Ao*T^2*e^- bo/T
For Nickel Ao = 3.0E5 amp/meter^2/deg^2 ,
bo = 58000 = 11,600 * Ew (work function eV)
With a 0.125 volt Zeta Potential T = 0.125*11600 = 1450 deg K
Hence the current density J = 3.0E5* 1450^2 * e^ - 58000/1450
= 2.68E-3 amperes per square meter.
OTOH. increasing the Zeta Potential to 0.150 volts increases
current density J to 3.0 amperes per square meter,
at a Zeta Potential of 0.2 volts J increases to 22,000 amperes
per square meter.
More than you need in the approximately 0.7 square
meter Metal-Water Interface area in the JOE CELL. :-)
Fred
