As the wearable device industry develops, interest in fiber-type energy sources is increasing. In relation to the fiber-type energy source, studies related to the storage of energy in the form of fibers have been actively studied, but studies on the generation of energy in the form of fibers are experiencing difficulties. Although research on mechanical energy harvesters using human movements is being conducted, energy harvesters such as triboelectric and piezoelectric are difficult to produce in fiber form, and in the case of fiber form, the energy generated is very small. In 2017, our group made electrochemical base mechanical energy harvesting using the carbon nanotube yarn. Although this harvester is in the form of a fiber, the longitudinal contraction / relaxation of the harvester is required. In addition, it is studied for solar power generation, but it is difficult to have flexible and tough properties of fibers. Here, we are going to introduce a fiber type energy harvester system that does not require mechanical changes, solar heat, heat, etc. This harvester is composed of electrochemical base two different materials of potential of zero charge (PZC). It is a method of generating energy with the PZC difference of the two materials, so the amount of energy generated is very small, but this system is likely to be the basis for a new energy harvester in the future.