@article{Sun2024, 
author = {Luo Sun and Zhiguo Ye and Xinyuan Peng and Shaojie Zhuang and Duosheng Li and Zhong Jin},
title = {Self-Powered Piezo-Supercapacitors Based on ZnO@Mo-Fe-MnO2 Nanoarrays},
year = {2024},
journal = {Energy & Environmental Materials},
volume = {7},
number = {4},
pages = {e12685},
keywords = {MnO2, piezoelectric, self-charging, supercapacitors, ZnO nanoarray},
url = {https://www.sciopen.com/article/10.1002/eem2.12685},
doi = {10.1002/eem2.12685},
abstract = {The development of self-charging supercapacitor power cells (SCSPCs) has profound implications for smart electronic devices used in different fields. Here, we epitaxially electrodeposited Mo- and Fe-codoped MnO2 films on piezoelectric ZnO nanoarrays (NAs) grown on the flexible carbon cloth (denoted ZnO@Mo-Fe-MnO2 NAs). A self-charging supercapacitor power cell device was assembled with the Mo- and Fe-codoped MnO2 nanoarray electrode and poly(vinylidenefluoride-co-trifluoroethylene) (PVDF-Trfe) piezoelectric film doped with BaTiO3 (BTO) and carbon nanotubes (CNTs) (denoted PVDF-Trfe/CNTs/BTO). The self-charging supercapacitor power cell device exhibited an energy density of 30 μWh cm−2 with a high power density of 40 mW cm−2 and delivered an excellent self-charging performance of 363 mV (10 N) driven by both the piezoelectric ZnO nanoarrays and the poly(vinylidenefluoride-co-trifluoroethylene) piezoelectric film doped with BaTiO3 and carbon nanotubes. More intriguingly, the device could also be self-charged by 184 mV due to residual stress alone and showed excellent energy conversion efficiency and low self-discharge rate. This work illustrates for the first time the self-charging mechanism involving electrolyte ion migration driven by both electrodes and films. A comprehensive analysis strongly confirmed the important contribution of the piezoelectric ZnO nanoarrays in the self-charging process of the self-charging supercapacitor power cell device. This work provides novel directions and insights for the development of self-charging supercapacitor power cells.}
}