Ultrafast sulfur redox dynamics enabled by a PPy@N‑TiO2 Z‑scheme heterojunction photoelectrode for photo‑assisted lithium–sulfur batteries

While lithium–sulfur batteries (LSBs) promise 2600 Wh kg⁻¹, the sluggish liquid-solid conversion of polysulfides keeps practical capacities far below theory. Now, researchers at Northwestern Polytechnical University, led by Prof. Yibo He, report a free-standing PPy@N-TiO ₂ /Carbon-Cloth photocathode that harvests sunlight to co-drive sulfur redox, delivering 1 653 mAh g ^-1 (98.7 % of theory) and 333 mAh g ^-1 after 5 h of pure photo-charging. Published in Nano-Micro Letters , the work realizes dual-mode energy harvesting in a single cell.

Why Photo-Assisted Strategy Matters

Innovative Heterojunction Design

Performance Breakthroughs

Future Outlook
The plug-and-play photocathode design is scalable through roll-to-roll vapor coating, pointing toward solar-assisted EV packs and stratospheric drones where every photon counts.

Nano-Micro Letters

10.1007/s40820-025-01946-3

News article

Ultrafast Sulfur Redox Dynamics Enabled by a PPy@N‑TiO2 Z‑Scheme Heterojunction Photoelectrode for Photo‑Assisted Lithium–Sulfur Batteries

1-Jan-2026