Ti Dopants as a Morphology-Stabilizing Agent in Mesoporous Ruthenium Oxide Electrodes

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Ruthenium oxide (RuO_x) possesses excellent electrochemical properties for catalysis, sensors, and energy storage.
• Efficient use of scarce ruthenium necessitates strategies like nanostructuring and crystallization.
• Achieving both high surface area and stability is challenging due to pore collapse during crystallization.

Purpose of the Study:

• To develop a method for synthesizing highly crystalline and mesoporous ruthenium oxide films.
• To investigate the role of titanium doping in stabilizing the mesoporous structure of RuO_x at high temperatures.
• To evaluate the electrochemical performance and stability of Ti-doped RuO_x for the chlorine evolution reaction.

Main Methods:

• Synthesis of soft-templated mesoporous RuTiO_x films.
• High-temperature calcination to induce crystallization.
• Electrochemical characterization, including cyclic voltammetry and chronoamperometry.
• Analysis of structural and electronic properties.

Main Results:

• Ti-doping successfully stabilized the mesoporous structure of RuO_x during high-temperature calcination, yielding crystalline RuTiO_x films.
• The RuTiO_x films retained their mesostructure without pore collapse or cracking.
• RuTiO_x electrodes demonstrated high catalytic activity for the chlorine evolution reaction (CER), achieving >500 mA cm^-2 at 1.50 V_Ag/AgCl.
• Improved operational stability was observed for RuTiO_x compared to pure RuO_x.

Conclusions:

• Titanium doping plays a dual role: stabilizing film morphology and tuning electronic structure.
• The developed RuTiO_x material offers a general strategy for combining high surface area with long-term durability in mesostructured electrocatalysts.
• This approach provides a pathway for efficient utilization of ruthenium in demanding electrochemical applications.