Nanostructured Pt coupled with TiO_x/Ti frameworks for the electrocatalytic chlorine evolution reaction

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Electrocatalysis is crucial for energy conversion and chemical synthesis.
• Developing efficient and stable electrocatalysts for the chlorine evolution reaction (CER) is essential for industrial applications.
• Current electrocatalysts often suffer from low activity, poor stability, or high cost.

Purpose of the Study:

• To develop a novel, strongly coupled platinum nanostructure-titanium oxide/titanium (Pt-TiO_x/Ti) framework for electrocatalysis.
• To evaluate the electrocatalytic performance of the as-prepared Pt-TiO_x/Ti for the acidic chlorine evolution reaction.
• To compare the activity and stability of the Pt-TiO_x/Ti with commercial electrocatalysts.

Main Methods:

• Facile synthesis of Pt nanostructure-TiO_x/Ti frameworks using drop-casting and annealing.
• Electrochemical characterization including overpotential measurements at a current density of 10 mA cm^-2.
• Long-term stability testing for at least 100 hours.
• Mass activity comparison at 1.5 V vs. RHE for the acidic chlorine evolution reaction.

Main Results:

• The Pt-TiO_x/Ti frameworks exhibited a low overpotential of 54 mV at 10 mA cm^-2.
• The electrocatalyst demonstrated robust stability for over 100 hours.
• The Pt-TiO_x/Ti showed a 20-fold higher mass activity compared to commercial Pt/C and RuO₂ for the acidic CER.
• The strongly coupled nanostructure architecture is key to the enhanced performance.

Conclusions:

• The facilely prepared Pt-TiO_x/Ti framework is a highly efficient and stable electrocatalyst for the acidic chlorine evolution reaction.
• This novel material significantly outperforms existing commercial catalysts, offering a promising alternative for industrial applications.
• The strong coupling between Pt nanostructures and the TiO_x/Ti support is critical for achieving superior electrocatalytic activity and durability.