## 3 Results and Discussion
### Polarization of GO/CC Specimens  
#### 3.3.1 Polarization of GO/CCs with Different GO Concentrations and Drying States  
In Figure 7a-f, we can observe the specimen current intensity's decreasing curve during stages I-VI of water loss. During the ten-minute energization period, it is apparent that the current intensity decreases gradually, that is, the resistivity increases gradually. The current intensity drop can be divided into two stages: P1 and P2. The current intensity of the P1 section decreases rapidly, and the current of P2 shows a slow drop trend. The specimens with different GO concentrations in the six drying states showed similar situations. Figure 7g shows the decrease in current intensity with decreases in water loss, and that this decrease is of the same magnitude after WL \(>\) 8% for all GO concentration specimens. The decrease in current intensity of GO/CC specimens with different GO concentrations shows different results for WL \(<\) 8%. The decrease in current intensity for specimens with 0% and 0.025% GO concentration is significantly larger, whereas there are large ups and downs for specimens with WL = 2% and 6%. When the WL was more than 8%, the drop values of GO/CCs with 0.05%, 0.075%, and 0.1% GO concentrations were more stable. Furthermore, when the WL was less than 8%, the drop values showed a linear correlation with WL. The drop values of the specimens with high GO concentrations of 0.05%, 0.075%, and 0.1% were smaller than those of the specimens with low GO concentrations of 0% and 0.025%. Figure 7: _Cont._  
At the I, II, III, and IV drying states, as shown in Figure 7, the current curves of the specimens without added GO still showed a large downward trend after ten minutes of energization. This phenomenon may be related to the high moisture content of the specimens, contributed to by the connection of water in the microscopic pores. Ions are constantly migrating towards the poles. Charges in the form of ions cannot enter the electronic conductor via conduction, and so they collect at both ends of the conductor connection: positive ions at one end, and negative ions at the other. Opposite electric fields are formed relative to the power source [22]. Therefore, the current intensity of the specimen decreases over an extended period of time. The gradual enhancement in the opposite electric field causes the decreasing trend to change from fast to slow, such as in the P1 and P2 stages. For the specimen with 0.025% GO concentration, due to the lower GO concentration, the decreasing amplitude in the I, II, III, IV, and V drying states is almost the same as that of the blank group; the current rebound phenomenon occurs only in the II and III drying states. This is because the conductivity of the specimen is still dominated by ionic conductivity, and the electronic conductivity of GO fails to have a large impact. Compared with the specimens with 0% and 0.025% GO concentrations, the current trend of the specimens with 0.05%, 0.075%, and 0.1% GO concentrations was obviously stabilized after a period of energization. Not only did the decreasing trend slow down significantly, but the current rebound phenomenon was observed at different drying states. Therefore, it is concluded that the addition of GO can attenuate the polarization, slow down the decreasing trend of the current, and lead to a rebound of the current. Figure 7: Polarization phenomenon and current intensity change: (**a**) drying state I; (**b**) drying state II; (**c**) drying state III; (**d**) drying state IV; (**e**) drying state V; (**f**) drying state VI; (**g**) specimen current intensity drop value; and (**h**) specimen current strength recovery value. The current rebound phenomenon was analyzed for different specimens. The rebound phenomenon is affected by both GO concentration and WL. Figure 7h demonstrates the current intensity uplift values of the rebound phenomenon at different drying states for different GO concentrations.