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Phase-Engineered 1T/2H-MoS₂ Heterostructures for High-Conversion-Efficiency Lithium-Ion Photobatteries.

Xuwu Xiao¹, Cheng Cheng¹, Cuizhi Chen¹

¹Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian 350117, China.

|February 27, 2026

Summary

Engineered molybdenum disulfide (MoS2) heterostructures on carbon nanotubes enable efficient solar energy harvesting and storage. This breakthrough in photobatteries significantly enhances lithium-ion storage capacity and photoconversion efficiency.

Keywords:

MoS2 heterostructure interface engineering photobatteries photoconversion and storage

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Area of Science:

Materials Science
Energy Storage
Nanotechnology

Background:

Photobatteries offer a dual function for solar energy harvesting and storage.
Key limitations include rapid carrier recombination and inefficient charge transfer interfaces.

Purpose of the Study:

To develop an advanced photobattery architecture for improved solar energy conversion and storage.
To address carrier recombination and charge flow issues in solar energy devices.

Main Methods:

Fabrication of an in-plane 1T/2H-MoS2 heterostructure integrated with carbon nanotubes (CNTs).
Utilized ultrafast transient absorption spectroscopy to analyze carrier dynamics.
Employed Kelvin probe force microscopy to investigate potential gradients and carrier extraction.

Main Results:

The 1T/2H-MoS2@CNTs heterostructure exhibited a prolonged carrier lifetime (731 ps) and a significant light-induced potential gradient (75 mV).
Demonstrated enhanced photoassisted lithium-ion storage capacity (624.9 mAh g-1 at 0.5 A g-1 under illumination).
Achieved a maximum photoconversion and storage efficiency of 6.62% with a self-charging capability.

Conclusions:

Rational multi-interface engineering is crucial for integrating light harvesting and electrochemical storage.
The developed MoS2-based photobattery represents a significant advancement for self-charging energy systems.
This work provides a pathway for next-generation solar energy harvesting and storage solutions.