Chapter 14, Problem 14.28P

Interpretation Introduction

Interpretation:

Capacities of a conventional lead-acid battery and hydrogen-oxygen fuel cell have to be compared.

Concept Introduction:

A rechargeable battery is termed as secondary cell. It is different from primary cells that once discharge cannot be charged again and hence need to be discarded. Chemistry that occurs at cathode for $\text{Ni-}$ metal hydride battery as it charges and discharges is indicated as follows:

  $\text{NiOOH}\left(s\right)+{\text{H}}_{\text{2}}\text{O}+{\text{e}}^{-}\rightleftharpoons \text{Ni}{\left(\text{OH}\right)}_2+{\text{OH}}^{-}$

Chemistry that occurs at anode for $\text{Ni-}$ metal hydride battery as it charges and discharges is indicated as follows:

  $\text{MH}\left(s\right)+{\text{OH}}^{-}\rightleftharpoons \text{M}+{\text{H}}_{\text{2}}\text{O}+{\text{e}}^{-}$