Abstract
Self-charging power cell (SCPC) that is able to directly convert mechanical energy into chemical energy is attracting increasing attention recently for its enhanced energy conversion efficiency and simplified fabrication process. The SCPC can be efficiently and stably charged up by mechanical deformation in the absence of an external power source. A novel PVDF/BCT-BZT nanocomposite film with porous structure has served as the piezo-separator for a piezo-driven SCPC. The presence of appropriate content of lead-free piezoelectric material 0.5(Ba0.7Ca0.3) TiO3- 0.5Ba(Zr0.2Ti0.8)O3(BCT-BZT) nanofibers, which are obtained by electrospinning, would not only intensify the piezoelectric potential but also provide a porous structure in the nanocomposite film. The influence of different content of BCT-BZT nanofibers on the properties of SCPC is systematically investigated. The PVDF/BCT-BZT nanocomposite film with its mass ratio of 8:2 (P@B-2) exhibits much higher piezo-potential, lower charge transfer resistance, larger storage capacity, and less capacity decay than those of pure PVDF film, simultaneously enabling a good self-charging effect induced by the piezo-potential. The excellent performance for P@B-2 nanocomposite film can be ascribed to high piezo-potential due to compound BCT-BZT piezo-fibers and more pores caused by appropriate doping ratio, showing its promising application prospect in piezo-separator for SCPC.
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