Question

$\: what \: is \: negative \: and \: postive \: energy \: in \: cell \: one \: who \: follow \: me \: iwill \: follow \: him \: or \: her \: back$
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Answer 1

Answer:

it's just for creating potential difference between the terminal. as results EMF produced.

Answer 2

negative cells is: Recently I was analyzing various v-i curves of different types of fuel cell. While simulating a fuel cell stack I could figure out an v-i curve (whose .jpg file is attached) which is bit different from the conventional v-i curves of fuel cell. I find the voltage is going to negative value, but generally we do not find a v-i cuve of fuel cell whose voltage goes to negative, v-i cuve with positive voltages are generally seen in books, or research papers.