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International Conference on Mechanical, Materials and Renewable Energy IOP Publishing IOP Conf. Series: Materials Science and Enginee1ri2n3g4357678(920‘1’8“)” 012186 doi:10.1088/1757-899X/377/1/012186 which rotational mechanical energy can be converted into electrical energy. When the two triboelectric materials rub each other, electron transfer takes place between the surfaces of high to low electrochemical potential energy so as to reach an equilibrium condition. The current generated enhanced with the increase in angular frequency and the rotation speed [29].Cheng et al. proposed a strategy for extracting maximum energy from the TENG. They designed an appropriate power management strategy to power small energy storage units (battery). For maximum output of the system, the resultant output energy of the TENG should be maximized and transfer of output energy to the storage unit should be done with minimum loss using smaller resistances [30]. 2.4. Different methods for surface charge density enhancement 2.4.1 Enhancement of surface charge density by heating Different methods can be used to improve the output power with the help of Nano to micro morphology by using simple glass transition of polystyrene. In this method heating is done which results in shrinkage. The longer is the heating better shrinkage occurs which implies an efficient Nano to microscale morphology. Thus the output is improved without any complex or tricky manufacturing process [31]. Figure 9. Schematic diagram of the crumpled Au/PS contact electrode. [31] Here the material was heated to improve the surface morphology which directly enhances the charge generation. Due to the shrinkage, more charge was produced resulting in better efficiency [31]. 2.4.2 Enhancement of surface charge density by plasma treatment Plasma treatment can be done on the surface of PDMS film by chemically treating with argon plasma before the experiment. Smooth and micropillar arrays are engraved on the surface films by using plasma treatment. Some parameters such as treating time, plasma power and the roughness of the films are altered, as the treatment time is increased, the roughness of the films increases first and then decreases with time. Due to plasma treatment, a small column-like structure is distributed on the surface resulting in increase of roughness of the surface and a larger contact area, leading to more 10PDF Image | Critical Review on Triboelectric Nanogenerator
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