A secondary cell devised by Thomas Edison (1847–1931) having a positive plate of nickel oxide and a negative plate of iron both immersed in an electrolyte of potassium hydroxide. The reaction on discharge is 2NiOOH.H2O+Fe → 2Ni(OH)2+Fe(OH)2, the reverse occurring during charging. Each cell gives an e.m.f. of about 1.2 volts and produces about 100 kJ per kilogram during each discharge. The nickel-cadmium cell is a similar device with a negative cadmium electrode. It is often used as a dry cell. Compare lead-acid accumulator.
2NiOOH.H2O+Fe → 2Ni(OH)2+Fe(OH)2
Subjects: Chemistry — Physics.