Answer
It will expand.
Work Step by Step
Because the $Co^{4+}$ ions are reduced to $Co^{+3}$ and $Co^{+3}$ ions are larger than $Co^{+4}$ ions, the electrode expands.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 7 - Periodic Properties of the Elements - Additional Exercises - Page 294: 7.89c
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