Hollow RuSe2‐MoSe2@NC Microsphere/Chitosan Aerogel Janus Electrode for Solar‐Driven Photothermal‐Promoted Synchronous Seawater Splitting and Evaporation

Why It Matters

By coupling high‑efficiency seawater electrolysis with solar evaporation, the technology offers a dual solution to energy and water shortages, potentially lowering operational costs for coastal hydrogen plants.

Key Takeaways

• Hollow RuSe2‑MoSe2@NC provides superior photothermal conversion
• Janus structure prevents salt buildup during operation
• Overall water‑splitting voltage drops to 1.77 V under sunlight
• Evaporation rate reaches 2.80 kg m⁻² h⁻¹, 92% efficiency
• Catalyst‑gel integration simplifies electrode fabrication

Pulse Analysis

The new Janus electrode leverages a catalyst‑gel integration strategy, embedding hollow RuSe2‑MoSe2@NC microspheres and carbon black into a porous chitosan aerogel. This architecture creates a bifunctional surface: one side acts as a high‑performance electrocatalyst for hydrogen and oxygen evolution, while the opposite side serves as a photothermal absorber that converts solar energy into heat. The hollow, nitrogen‑doped carbon shell around the RuSe2‑MoSe2 core enhances light absorption and charge transfer, addressing the long‑standing challenge of combining seawater electrolysis with solar evaporation on a single device.

Performance metrics underscore the breakthrough. In alkaline seawater, the electrode drives overall water splitting at 100 mA cm⁻² with only 1.81 V, which further declines to 1.77 V under one sun illumination—a reduction that translates into significant energy savings. Simultaneously, the photothermal side achieves an evaporation rate of 2.80 kg m⁻² h⁻¹ and a 92% conversion efficiency, surpassing many standalone solar evaporators. The asymmetric Janus design also mitigates salt crystallization, ensuring stable operation over prolonged periods, a critical factor for real‑world marine environments.

From a market perspective, this dual‑function electrode could reshape coastal hydrogen production and desalination infrastructure. By consolidating two energy‑intensive processes, operators can lower capital expenditures, reduce footprint, and improve overall system resilience. The scalable chitosan aerogel matrix and straightforward synthesis suggest a viable pathway for large‑scale manufacturing, positioning the technology as a compelling candidate for integration into renewable‑energy hubs and off‑grid water‑energy systems.