Deep Reconstruction of Ruthenate Perovskite Oxide Enables Efficient pH-Universal Hydrogen Evolution Reaction.

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Developing efficient and stable electrocatalysts for the hydrogen evolution reaction (HER) is crucial for clean energy technologies.
• Perovskite materials offer tunable properties but often struggle with pH universality and stability.

Purpose of the Study:

• To design and synthesize a highly efficient, stable, and pH-universal perovskite electrocatalyst for the hydrogen evolution reaction.
• To investigate the structure-activity relationship and surface reconstruction mechanisms of the developed perovskite during HER.

Main Methods:

• Synthesis of titanium-containing strontium ruthenate (SrTi0.5Ru0.5O3, STRO) perovskite.
• Electrochemical characterization of STRO for HER in acidic, alkaline, and neutral media.
• Analysis of surface reconstruction and active species formation using advanced techniques.

Main Results:

• The synthesized STRO exhibits significantly reduced particle size and undergoes surface reconstruction during HER, forming highly active metallic Ru species.
• STRO demonstrates remarkable HER activity with low overpotentials (18 mV in KOH, 24 mV in H2SO4, 55 mV in PBS at 10 mA cm-2).
• The electrocatalyst shows excellent long-term stability (>200 h) in various pH conditions, surpassing commercial Pt/C.

Conclusions:

• The Ti-induced surface reconstruction of STRO is key to its enhanced HER performance and pH universality.
• STRO presents a promising alternative to platinum-based catalysts for efficient hydrogen production.
• This study offers new insights into perovskite electrocatalyst design for sustainable energy applications.