173415.fig.004a
(a)
173415.fig.004b
(b)
173415.fig.004c
(c)
173415.fig.004d
(d)
Figure 4: Surface morphologies of the manganese oxide (formed by thermally decomposing Mn(NO3)2 at 300°C)/CNT (treated with acid for 5 min)/Al foil composite electrode (a) before potential cycling and after potential cycling, (b) at 10 cycles, (c) at 100 cycles, and (d) at 1000 cycles.