Metal Defect-Mediated Adsorption-Catalytic Platform Drives Efficient Electrochemiluminescence Sensing.

Area of Science:

• Materials Science
• Analytical Chemistry
• Nanotechnology

Background:

• Highly active catalytic interfaces are crucial for sensitive electrochemiluminescence (ECL) biosensors.
• Rational design of these interfaces is key for reliable detection.

Purpose of the Study:

• To construct a metal defect-mediated adsorption-catalytic interface for enhanced ECL biosensing.
• To develop a sensitive method for detecting microcystin-LR (MC-LR).

Main Methods:

• Synthesized La-deficient LaCoO3 (LCO-VLa) via cation vacancy engineering.
• Investigated the effect of La vacancy (VLa) on coreactant (K2S2O8) adsorption and catalytic activity.
• Incorporated dual ligands with porphyrin groups to enhance electroluminescent properties.

Main Results:

• LCO-VLa significantly enhanced coreactant adsorption and exposed Co-rich active sites.
• The Co redox reaction facilitated O-O bond weakening in S2O8(2-), improving catalytic activity.
• Synergistic effects between the defect interface and dual-ligand framework boosted ECL signals for MC-LR detection.

Conclusions:

• The developed LCO-VLa interface and dual-ligand framework offer a reliable analytical tool for ultratrace pollutant monitoring.
• This strategy enhances ECL efficiency and sensitivity for environmental analysis.