TY - JOUR
T1 - Energy Optimization of a Mirror-Symmetric Spherical Triboelectric Nanogenerator
AU - Gravesen, Jens
AU - Willatzen, Morten
AU - Shao, Jiajia
AU - Wang, Zhong Lin
PY - 2022
Y1 - 2022
N2 - A general theoretical analysis of a 3D generic TENG structure is presented. Using a dimensionless formulation, it is demonstrated that the optimal TENG geometry does not depend on the frequency of the moving dielectric but the external ohmic impedance for maximum power output is inversely proportional to the frequency. It is also found that the energy is proportional to the cube of the size of the TENG, the square of the triboelectric charge density σT, and the angular frequency ω of the moving dielectric. In the case of a spherical TENG where the moving dielectric is a sphere and the electrodes are spherical caps on a larger sphere three dimensionless parameters that determine the harvested energy are identified: the ratio between the radii of the two spheres (Formula presented.) = r/R, the polar angle θ of the two spherical caps formed by the electrodes, and (Formula presented.) = ZεRω, where Z is the external impedance, R is the radius of the large sphere, ε is the permittivity of the system, and ω is the angular frequency of the moving sphere. Under the crude assumption of constant charge density on the electrodes, the optimal parameters can be easily calculated. It is found that θ = 1.1 rad, (Formula presented.) = 0.67, and (Formula presented.) = 0.18.
AB - A general theoretical analysis of a 3D generic TENG structure is presented. Using a dimensionless formulation, it is demonstrated that the optimal TENG geometry does not depend on the frequency of the moving dielectric but the external ohmic impedance for maximum power output is inversely proportional to the frequency. It is also found that the energy is proportional to the cube of the size of the TENG, the square of the triboelectric charge density σT, and the angular frequency ω of the moving dielectric. In the case of a spherical TENG where the moving dielectric is a sphere and the electrodes are spherical caps on a larger sphere three dimensionless parameters that determine the harvested energy are identified: the ratio between the radii of the two spheres (Formula presented.) = r/R, the polar angle θ of the two spherical caps formed by the electrodes, and (Formula presented.) = ZεRω, where Z is the external impedance, R is the radius of the large sphere, ε is the permittivity of the system, and ω is the angular frequency of the moving sphere. Under the crude assumption of constant charge density on the electrodes, the optimal parameters can be easily calculated. It is found that θ = 1.1 rad, (Formula presented.) = 0.67, and (Formula presented.) = 0.18.
U2 - 10.1002/adfm.202110516
DO - 10.1002/adfm.202110516
M3 - Journal article
SN - 1616-301X
VL - 2022
JO - Advanced Functional Materials
JF - Advanced Functional Materials
M1 - 2110516
ER -