Pd single atoms on g-C₃N₄ photocatalysts: minimum loading for maximum activity

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Noble metal single atoms (SAs) are promising co-catalysts for photocatalytic hydrogen production.
• Graphitic carbon nitride (g-C3N4) is a semiconductor material explored for photocatalysis.

Purpose of the Study:

• To develop a novel method for anchoring palladium (Pd) SAs onto g-C3N4.
• To investigate the impact of Pd SAs on photocatalytic hydrogen production efficiency.

Main Methods:

• A spontaneous deposition approach using a dilute tetraaminepalladium(ii) chloride precursor.
• Anchoring Pd SAs onto graphitic carbon nitride (g-C3N4).
• Characterization of the resulting material and evaluation of its photocatalytic activity.

Main Results:

• Achieved maximized photocatalytic activity with a very low Pd loading (0.05 wt%).
• Demonstrated a hydrogen production efficiency of 0.24 mmol h-1 mg-1 Pd, over 50 times higher than Pd nanoparticles.
• Observed significantly reduced charge transfer resistance.

Conclusions:

• The spontaneous deposition method effectively creates highly active Pd SAs on g-C3N4.
• Optimized electron transfer due to Pd SA coordination enhances catalytic performance.
• This approach offers a highly efficient pathway for photocatalytic hydrogen production.