An integrated solar battery based on a charge storing 2D carbon nitride

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy

Background:

• Solar energy conversion and storage are crucial for sustainable energy infrastructure.
• Existing solar battery technologies face limitations in efficiency and material availability.

Purpose of the Study:

• To develop an integrated, earth-abundant solar battery with enhanced energy output.
• To explore a novel bifunctional carbon nitride photoanode for light absorption and charge storage.

Main Methods:

• Fabrication of a solar battery using a K-PHI carbon nitride photoanode and organic charge storage materials.
• Implementation of an internal ladder-type hole transfer cascade via a transport layer.
• Evaluation of light-assisted charging and discharging performance compared to dark operation.

Main Results:

• The integrated solar battery demonstrated significantly increased charge output (243%) under light-assisted operation.
• Electric coulombic efficiency improved from 68.3% in the dark to 231% under illumination.
• Overall energy improvements of 94.1% were achieved with light-assisted charging and discharging.

Conclusions:

• The developed solar battery concept offers a new pathway for highly integrated, earth-abundant energy storage devices.
• The use of multifunctional carbon-based electrodes and separators enables a new generation of solar batteries.
• This technology holds promise for advancing sustainable energy solutions.