ELECTROCATALYTIC WATER OXIDATION BY METAL ORGANIC FRAMEWORKS

Abstract

CO(MN, NI) (BTC), CO(TP) AND CO(PZDC) METAL ORGANIC FRAMEWORKS (MOFS) WERE SYNTHESIZED AND TESTED AS ELECTROCATALYSTS FOR WATER OXIDATION. AMONG THEM, CO(BTC) SHOWED EXTRAORDINARY ACTIVITY. THE CATALYTIC ONSET OVERPOTENTIAL OF CO(BTC) IS 400 MV AND THE STABILITY OF CO(BTC) LASTS AS LONG AS 75 MIN AT A 0.5 MA/CM2 CURRENT DENSITY UNDER ANODIC POTENTIAL OF 1.1 V. ITS STRUCTURE AND MORPHOLOGY WERE STUDIED BY XRD AND SEM. IN ADDITION, CO(TP) MOF WAS MODIFIED USING A FACILE METHOD. IT EXHIBITED HIGHER CATALYTIC ACTIVITY AND EFFICIENCY FOR WATER OXIDATION AFTER THE MODIFICATION. THE ONSET OVERPOTENTIALS FOR THIS MODIFIED MOF WAS 390 MV AND THE CURRENT DENSITY INCREASED FROM 0.6 MA/CM2 TO 1.55 MA/CM2 DURING THE 75 MIN MEASUREMENT. THE STRUCTURES AND MORPHOLOGIES OF CO(TP) BEFORE AND AFTER MODIFICATION WERE INVESTIGATED. THIS STUDY MAY PROVIDE GUIDANCE IN THE FURTHER DEVELOPMENT OF EASILY PREPARED, LOW-COST AND EFFICIENT CATALYSTS BASED ON MOFS.