Biopolymer-Inspired N-Doped Nanocarbon Using Carbonized Polydopamine: A High-Performance Electrocatalyst for...

Area of Science:

• Electrochemistry
• Materials Science
• Renewable Energy

Background:

• The hydrogen-evolution reaction (HER) is crucial for renewable energy, with electrochemical methods offering a clean hydrogen production pathway.
• Polydopamine (PDA), a biocompatible biopolymer, can be synthesized using environmentally friendly methods.
• Developing efficient and sustainable electrocatalysts for HER is essential for energy technologies.

Purpose of the Study:

• To develop a biomimetic, eco-friendly method for fabricating nitrogen-doped carbon nanosheets (N-CNs) for high-performance HER.
• To investigate the catalytic activity of N-CNs derived from carbonized polydopamine (C-PDA) in acidic media.
• To elucidate the structure-activity relationship governing the enhanced HER performance.

Main Methods:

• Facile synthesis of nitrogen-doped nanocarbons via carbonization of polydopamine (C-PDA).
• Electrochemical characterization of the synthesized N-CNs for hydrogen evolution reaction (HER) performance.
• Experimental analysis and theoretical computations to understand the doping effects and active sites.

Main Results:

• The N-doped nanocarbons derived from C-PDA demonstrated excellent performance in HER.
• Achieved an overpotential of 130 mV at 5 mA/cm² and a Tafel slope of 45 mV/decade.
• Multisite nitrogen doping, particularly tertiary/aromatic nitrogen, was identified as key to enhanced electroactivity and HER performance.

Conclusions:

• The biomimetic synthesis of N-doped nanocarbons from C-PDA provides a sustainable and effective route for HER electrocatalysts.
• The enhanced HER activity is attributed to the unique electronic structure and multisite nitrogen doping.
• This approach offers a promising strategy for cost-effective and clean hydrogen production.