Figure 3
Comparison of the different electrode materials.
(a) CV curves of MnO2-CFs SC and CFs SC. (b) A SEM image of a MnO2-CF: region I was immersed into H3PO4 solution of 9.1 wt. % for 12 h; region II was above the liquid surface. (c) CV curves of PPy-MnO2-CFs, PPy-CFs SC and CFs SC. For comparison, the current of CFs SC and PPy-CFs SC were magnified 500 and 50 times to their measuring value, respectively. (d) A SEM image of a PPy-MnO2-CF after it was immersed into H3PO4 solution of 9.1 wt. % for 24 h. It remains the feature of the as-prepared PPy-MnO2-CF (see figure 2c). The scan rate of all the CV curves was 100 mV s−1.
