Nitrogen-doped pyrolytic carbon films as highly electrochemically active electrodes

Area of Science:

• Electrochemistry
• Materials Science
• Surface Chemistry

Background:

• Pyrolytic Carbon (PyC) is a versatile material for electrochemical applications.
• Functionalization of PyC can significantly alter its electrochemical properties.
• Nitrogen doping is a common strategy to enhance electrode performance.

Purpose of the Study:

• To investigate the electrochemical properties of Nitrogen-doped Pyrolytic Carbon (N-PyC) films.
• To compare the performance of N-PyC with undoped PyC films.
• To explore the potential of N-PyC for electrochemical sensing applications.

Main Methods:

• Non-catalysed chemical vapour deposition (CVD) for PyC growth.
• Ammonia-hydrogen plasma for nitrogen functionalization.
• Electrochemical analysis using ferri/ferro-cyanide and hexaamine ruthenium(III) chloride redox probes.
• Surface characterization using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and atomic force microscopy (AFM).

Main Results:

• N-PyC films demonstrated significantly enhanced electron transfer properties compared to as-grown PyC.
• XPS confirmed the presence of nitrogen in edge plane graphitic configurations.
• SEM and AFM provided insights into the surface morphology of the N-PyC films.
• Quantified improvements in electrochemical performance were observed.

Conclusions:

• Nitrogen doping of PyC via ammonia-hydrogen plasma treatment leads to superior electrochemical performance.
• The N-PyC material exhibits excellent electron transfer kinetics.
• The ease of preparation and enhanced properties make N-PyC a promising candidate for electrochemical sensing devices.