Development of starch-based amorphous CoOx self-supporting carbon aerogel electrocatalyst for hydrogen evolution

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy

Background:

• Hydrogen energy is a critical research area for a sustainable future.
• Transition metal oxides and biomass composites are gaining attention for energy applications.
• Developing efficient and cost-effective catalysts for hydrogen production is essential.

Purpose of the Study:

• To synthesize and characterize a novel biomass-derived catalyst for the hydrogen evolution reaction (HER).
• To evaluate the electrocatalytic performance of the synthesized material for water electrolysis.
• To explore the potential of using abundant biomass resources for catalyst development.

Main Methods:

• Sol-gel method and high-temperature annealing were used to assemble potato starch and amorphous cobalt oxide into a carbon aerogel (CoOx/PSCA).
• The material was tested as a self-supporting catalyst for electrolysis in 1 M KOH.
• Electrocatalytic experiments were conducted to assess HER activity and performance.

Main Results:

• The CoOx/PSCA catalyst exhibited excellent HER activity, achieving a current density of 10 mA cm⁻² at 100 mV overpotential.
• The porous carbon aerogel structure facilitated mass transfer and prevented metal agglomeration.
• High electrical conductivity of carbon and synergistic effects from amorphous CoOx contributed to superior performance.

Conclusions:

• The developed CoOx/PSCA catalyst demonstrates a simple, scalable, and cost-effective method for producing biomass-based transition metal oxide composites.
• This catalyst shows great potential for efficient and stable hydrogen production through water electrolysis.
• The study highlights the viability of utilizing readily available biomass for advanced energy materials.