It is found that the AWIEG using neutral Na 2 SO 4 solution also shows enhanced output voltage as compared to the counterpart using pure water. This can be ascribed to the enhanced ionic strength of Na 2 SO 4 solution, which can reduce the dissociation of the oxygen-containing groups and increase the surface potential of OCBNP. Interestingly, the voltage of the AWIEG using a 1 M H 2 SO 4 lasted for a significantly longer time. This is because H 2 SO 4 can absorb moisture from the ambient air and prevent the wet region from drying. These results indicate that the undesirable dissociation-induced voltage generation can be inhibited by adding a salt or acid in water, leading to an obvious output enhancement of the AWIEG.