Electrospun Donor/Acceptor Nanofibers for Efficient Photocatalytic Hydrogen Evolution

Area of Science:

• Materials Science
• Photocatalysis
• Nanotechnology

Background:

• Developing efficient photocatalysts is crucial for sustainable hydrogen production.
• Conjugated materials with donor/acceptor (D/A) interfaces offer potential for enhanced charge separation.
• Controlling nanofiber morphology and composition is key to optimizing photocatalytic performance.

Purpose of the Study:

• To synthesize one-dimensional conjugated-material-based nanofibers with controlled morphology and D/A composition using electrospinning.
• To investigate the effect of D/A ratio and fiber diameter on photocatalytic hydrogen evolution efficiency.
• To demonstrate the advantages of electrospinning for creating advanced D/A heterojunction nanofibers.

Main Methods:

• Electrospinning of conjugated materials to form one-dimensional nanofibers.
• Tuning of donor/acceptor ratios and fiber diameters by controlling electrospinning parameters.
• Evaluation of photocatalytic hydrogen evolution rates under specific conditions.

Main Results:

• Homogeneous D/A heterojunction nanofibers were successfully prepared with controllable D/A ratios.
• D/A nanofibers exhibited a 34-fold increase in photocatalytic efficiency compared to single-component nanofibers.
• Photocatalytic activity was optimized by decreasing fiber diameter, with the smallest fibers achieving the highest hydrogen evolution rate (24.38 mmol/(gh)).

Conclusions:

• Electrospinning is an effective strategy for fabricating D/A nanofibers with tailored morphology and composition.
• Enhanced exciton dissociation in D/A nanofibers significantly boosts photocatalytic hydrogen evolution.
• Fiber diameter is a critical parameter for optimizing photocatalytic performance in these nanofiber systems.