It is possible to use a negative electron affinity electron donor.
Google "negative electron affinity" (use the quotes) Google NEA cathode Horace Heffner http://www.mtaonline.net/~hheffner/
It is possible to use a negative electron affinity electron donor.
Google "negative electron affinity" (use the quotes) Google NEA cathode Horace Heffner http://www.mtaonline.net/~hheffner/