By using a solution instead of the dielectric material, more energy can be stored within the device. When the capacitor becomes charged, the positively charged molecules in the solution become attracted to the negatively charged electrode (and opposite for the positively charged electrode). These positively charged molecules then become attached to the surface of the electrode, and pull in negatively charged molecules from the solution to form a spherical shape; however, these molecules are not attached as strongly. These two layers in the solution prevent the similar charges from pushing each other apart as much leading to an increase in the amount of charge the device can store. In experiments, it has been seen that there is a voltage drop across this layer, which works in the same way as a capacitor. This led to the first use of the term "electrical double layer" in the 1850s by Helmholtz and later being changed to "electrical double layer capacitance" (EDLC). Since this double layer capacitance happens at both electrodes, the theoretical capacitance of the entire device can be raised substantially. However, there are several other factors which can come into play, causing the actual capacitance of the device to not see as much benefit as expected.