Ultra-small-sized multi-element metal oxide nanofibers: an efficient electrocatalyst for hydrogen evolution.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Transition metal oxides (TMOs) are cost-effective alternatives to noble metals for electrocatalysis.
• Synergistic effects in multi-element TMOs can enhance catalytic performance.
• Synthesizing multi-component TMO catalysts and understanding component effects remain challenging.

Purpose of the Study:

• To develop multi-element ultra-small-sized nanofibers for efficient hydrogen production.
• To evaluate the electrocatalytic performance of ternary NiFeCoO nanofibers.
• To demonstrate the versatility of these nanofibers in photoelectrochemical applications.

Main Methods:

• Synthesis of multi-element ultra-small-sized nanofibers.
• Electrocatalytic testing in 1 M KOH for hydrogen evolution reaction.
• Stability testing over 10 hours.
• Application as a counter electrode in photoelectrochemical hydrogen production.

Main Results:

• The ternary NiFeCoO nanofiber electrode achieved an overpotential of 82 mV at 10 mA cm⁻² with a Tafel slope of 56 mV dec⁻¹.
• Performance metrics are comparable to platinum electrodes.
• The electrode demonstrated excellent stability, retaining 97% of its initial current density after 10 hours.
• Successful application as a counter electrode in photoelectrochemical hydrogen production.

Conclusions:

• Multi-element NiFeCoO nanofibers are highly efficient electrocatalysts for hydrogen production.
• These nanofibers offer a stable and versatile alternative to noble metal catalysts.
• The developed nanofibers show potential for broader applications in renewable energy technologies.