China has developed a battery that prefers bright lighting

Chinese scientists from Donghua University have made a breakthrough in zinc‑air battery technology

What’s new
- The problem they are solving:

In traditional zinc‑air batteries, the oxygen reduction and release reactions at the electrodes proceed slowly. This slows down the overall device efficiency.

- The “light catalyst” idea:

Instead of expensive metal‑based catalysts (platinum, iridium), researchers incorporated microscopic semiconductor diodes into the electrodes. They react to ordinary light: a photon excites electrons and holes that separate across a p‑n junction.

How the catalyst is arranged
Type Material Function
n‑type Graphite nanolayers of carbon nitride (g‑C₃N₄) Accepts electrons, accelerates oxygen reduction
p‑type Network of carbon nanofibers (CNF) with dual cobalt active sites:
• Co@CNT – cobalt particles inside carbon nanotubes
• Co–N₄ – isolated cobalt atoms bonded to nitrogen Donates holes, stimulates oxygen release

This spatial separation increases the rate of both reactions and makes the process more stable.

Experimental results
Metric Value
Peak power density 310 mW cm⁻² (comparable to the best lithium batteries)
Charge‑discharge cycle life > 1100 h with no noticeable degradation
Flexible versions At bends from 0° to 180°, 0° retains power up to 96 mW cm⁻²

Why it matters
- Cost‑effectiveness:

The entire material consists of cheap components: zinc, air, carbon, and cobalt. No need for platinum or other expensive metals.

- Mass manufacturability:

Nanostructured diodes can be integrated into electrodes without complex processes.

- New applications:

• Solar farms with built‑in energy storage (light‑active batteries)
• Wearable electronics where devices operate actively under illumination

Conclusion
Chinese researchers have opened the way to faster and more durable zinc‑air batteries that use “photo‑enhancement” instead of costly catalysts. This makes the technology potentially competitive in both price and performance, especially for flexible and light‑sensitive applications.