Photo-rechargeable batteries can implement solar energy harvesting and storage simultaneously and have attracted strong interest from researchers.The development of photoactive electrodes is the key to promoting the d...Photo-rechargeable batteries can implement solar energy harvesting and storage simultaneously and have attracted strong interest from researchers.The development of photoactive electrodes is the key to promoting the development of high-performance photocells.Herein,a free-standing BiOI@MWCNTs film is developed as photoelectrode to achieve the effective separation of photogenerated electron-hole pairs for high-efficiency solar-electric-chemical energy conversion.Light can charge up photocells with a photoconversion efficiency of∼1.3%,as well as accelerate charge transfer without requiring any external bias voltage.Ex situ XRD and XPS tests prove that the enhanced electrochemical reaction kinetics can improve the chemical-electric energy conversion efficiency under illumination.The capacity of the proposed photocell can be increased by 10.6%(from 195 mA h g^(-1)to 216 mA h g^(-1)at 0.2 A g^(-1))and 57.9%(from 76 mA h g^(-1)to 120 mA h g^(-1)at 5.0 A g^(-1))in light condition,while exhibiting a cyclic life of up to 600 cycles.This work can help to deepen the understanding of photo-rechargeable batteries.展开更多
基金supported by the Macao Young Scholars Program(AM2021011)the Macao Science and Technology Development Fund(0011/2019/APJ)+1 种基金the Research Committee of University of Macao(CPG2023-00005-IME)the Natural Science Foundation of China(52102312).
文摘Photo-rechargeable batteries can implement solar energy harvesting and storage simultaneously and have attracted strong interest from researchers.The development of photoactive electrodes is the key to promoting the development of high-performance photocells.Herein,a free-standing BiOI@MWCNTs film is developed as photoelectrode to achieve the effective separation of photogenerated electron-hole pairs for high-efficiency solar-electric-chemical energy conversion.Light can charge up photocells with a photoconversion efficiency of∼1.3%,as well as accelerate charge transfer without requiring any external bias voltage.Ex situ XRD and XPS tests prove that the enhanced electrochemical reaction kinetics can improve the chemical-electric energy conversion efficiency under illumination.The capacity of the proposed photocell can be increased by 10.6%(from 195 mA h g^(-1)to 216 mA h g^(-1)at 0.2 A g^(-1))and 57.9%(from 76 mA h g^(-1)to 120 mA h g^(-1)at 5.0 A g^(-1))in light condition,while exhibiting a cyclic life of up to 600 cycles.This work can help to deepen the understanding of photo-rechargeable batteries.
