Breakthrough in Energy Harvesting: Researchers Develop Novel Strategy for Efficient Water Splitting

Researchers at the University of Macau have made a significant discovery in the field of sustainable energy harvesting, developing a novel strategy for achieving high-performance water splitting. According to a recent study published in Carbon Energy, the team has created a photoelectrochemical (PEC) water splitting device that can efficiently convert solar energy into green hydrogen. The device's performance is enhanced by incorporating a bridge layer between the substrate and the cocatalyst, allowing for a remarkable current density of 39.6 mA cm-2, which is about 92.7% of the theoretical maximum.

Key Takeaways:

• The researchers developed a novel strategy for achieving ultrahigh current density by incorporating a bridge layer between the substrate and the cocatalyst.
• The optimal photoanode (TCO/n-p-Si/TCO/Ni) shows a remarkably low onset potential of 0.92 V vs. a reversible hydrogen electrode and a high saturation current density of 39.6 mA cm-2.
• The device demonstrates stable operation for 60 h and has the potential to be integrated into a PEC device for overall water splitting, leading to a reduction of the onset potential.
• The innovation is said to provide a viable pathway for fabricating high-performance industrial photoelectrodes by integrating a substrate and a cocatalyst via a transparent and conductive bridge layer.
• The study is supported by grants from the University of Macau and the Science and Technology Development Fund (FDCT) from Macau SAR.
• The researchers used systematic characterizations and calculations to demonstrate that the bridge layer facilitates charge transfer, enhances catalytic performance, and provides corrosion protection to the underlying substrate.

Statistics:

• The saturation current density of the optimal photoanode is 39.6 mA cm-2, which is about 92.7% of the theoretical maximum (42.7 mA cm-2).
• The onset potential of the photoanode is 0.92 V vs. a reversible hydrogen electrode.
• The device demonstrates stable operation for 60 h.
• The study provides a viable pathway for fabricating high-performance industrial photoelectrodes.

Sources:

• Bridge Layer-enabled Silicon-based Photoanode With High Photocurrent Density for Efficient and Stable Water Splitting. Carbon Energy, 2025.
• Researchers from University of Macau Describe Findings in Carbon Energy (Bridge Layer-enabled Silicon-based Photoanode With High Photocurrent Density for Efficient and Stable Water Splitting). Biotech Week. August 20, 2025; p 491.
• University of Macau, Faculty of Sciences and Technology, Dept. of Electromechanical Engineering.