Bei Long,Xiaojie Liang,Yong Pei,Xiongwei Wu,Xianyou Wang,Man-Kay Law
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.
Jingjing Zhao,Zhong Liu,Zhiyong Ji,Xiaowei An,Xiao Du,Fengfeng Gao,Xiaogang Hao,Jun Li
An electrochemically induced bismuth iodine oxide/multiwalled carbon nanotubes/polyvinyl alcohol (BiOI/MWCNTs/PVA) composite membrane electrode with iodide ion trap (I − -trap) was fabricated by prerelease of I − under reduction potential. The I − -trap BiOI/MWCNTs/PVA composite membrane with unique lattice confinement structures was used for the selective extraction of I − in an electrochemically switched ion permselective (ESIP) process. In the ESIP system, the direct uptake and release of I − were realized by applying a cell voltage-pulse potential (CV-PP) coupling circuit on the membranes to switch the oxidation/reduction state. The I − -trap BiOI/MWCNTs/PVA composite membrane exhibited a maximum flux of 8.32 mg·m −2 ·min −1 and superior electrochemical stability. The separation factors of I − /Br − , I − /Cl − , I − /NO 3 − , and I − /SO 4 2− in the mixed solutions were 2.67, 3.71, 3.82, and 6.70 respectively. Therefore, such a novel I − -trap BiOI/MWCNTs/PVA composite membrane could be used in the ESIP system for the selective extraction of I − ions from low concentration solutions.
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