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An all-solid-state photo-rechargeable battery based on Cs₃Bi₂I₉.

Rui Zhang¹, Zeng Chen¹, Jiping Ma¹

¹Key Laboratory of Photovoltaic Materials, Henan University, China. lishengjun@henu.edu.cn.

Chemical Communications (Cambridge, England)

|February 17, 2023

Summary

This study introduces a novel photo-rechargeable battery using lead-free perovskite Cs3Bi2I9 for energy storage and photoelectric conversion. This bismuth redox-based system demonstrates potential for powering devices in the dark.

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Development of sustainable energy storage solutions is crucial.
Perovskite materials offer promising optoelectronic properties.
Bismuth-based compounds are explored as alternatives to lead-based materials.

Purpose of the Study:

To present a novel two-electrode photo-rechargeable system.
To utilize lead-free perovskite Cs3Bi2I9 for combined photoelectric conversion and energy storage.
To demonstrate a battery system based on bismuth redox chemistry.

Main Methods:

Fabrication of a FTO/TiO2/Cs3Bi2I9/Pt/FTO device.
Investigation of the photoactive properties of Cs3Bi2I9.
Characterization of the battery's charging and discharging performance.
Testing the system's ability to power an LED.

Main Results:

The photo-rechargeable system successfully integrated photoelectric conversion and energy storage.
The Cs3Bi2I9 perovskite demonstrated photoactivity and electrochemical storage capabilities.
The fabricated battery exhibited an open-circuit voltage of ~0.28 V in the dark after photo-charging.
A series-connected pack of these batteries powered an LED for tens of seconds in the dark.

Conclusions:

This work presents the first battery system utilizing bismuth redox chemistry for charging and discharging.
The lead-free perovskite Cs3Bi2I9 shows potential as a photoactive material for integrated energy conversion and storage.
The developed system offers a glimpse into self-rechargeable power sources for low-power electronic devices.