Biochar Nanocomposite Derived from Watermelon Peels for Electrocatalytic Hydrogen Production

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Water splitting is a key method for hydrogen energy production.
• Conventional electrocatalysts face challenges like high overpotential and low efficiency.

Purpose of the Study:

• To develop a cost-effective and efficient electrocatalyst for water splitting.
• To investigate a novel carbon-based nanocomposite derived from watermelon peels.

Main Methods:

• Synthesized carbon-based nanocomposites (CCW-x) from watermelon peels and CoCl2.
• Evaluated electrocatalytic activity for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).
• Assembled a full water-splitting electrocatalyst using CCW-700 on nickel foam.

Main Results:

• CCW-700 exhibited lower overpotential and Tafel slope for OER compared to commercial RuO2.
• CCW-700 showed competitive overpotential for HER compared to other carbon-based nanomaterials.
• The assembled CCW-700//CCW-700 water-splitting device operated at a lower voltage (1.54 V) than RuO2//Pt/C (1.62 V).

Conclusions:

• The developed CCW-x nanocomposite demonstrates significant potential as an efficient electrocatalyst for hydrogen production.
• Utilizing waste materials like watermelon peels offers a sustainable route for advanced catalyst development.
• The CCW-700//CCW-700 system presents a promising alternative for efficient and low-voltage water splitting.