Considering the strong dependence of solar cells on light, a hybrid device integrating TENGs and solar cells can be fabricated to compensate the power harvesting efficiency of solar cells and extend the time of energy collection on the premise of not affecting the performance of solar cells [ 15].
This hybrid technology was obtained by employing three-dimensional (3D) hierarchical NiCo 2 O 4 arrays and active carbon (AC) as the Faradic and capacitive electrodes, respectively. With this configuration, the storage characteristic shown in Table 1 were achieved, while the relation between energy density and power density is provided in Fig. 6 B.
Although several excellences in the field of PV and energy storage are present worldwide, both at academic and industrial levels, only a part of the scientific community has considered as a priority the integration of energy conversion (or generation) and storage devices in an appropriate, innovative and commercially attractive way.
The new device achieved a solar storage efficiency of 2.3%, the highest recorded molecular thermal solar energy efficiency to date. It also lowered PV cell temperature by up to 8 °C (14 °F), reducing energy losses due to heat and increasing power conversion efficiency by 12.6%. Total solar energy utilization was up to 14.9%.
It involves the independent life of the two main components involved, i.e. PV unit and energy storage unit, which are electrically connected by cables. Such systems are usually expensive, bulky and not flexible (both in terms of shape and architecture), also suffering energy loss through the connecting cables and control electronics.
The charging state of the solar battery is defined by charge C, energy E, and voltage U. (b) Efficiency of photocharging η pc, electric charging (round-trip efficiency) η rt, and overall efficiency of photo- and electric charging (solar-to-output efficiency) η so.
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