Metal organic framework-derived Ni-Cu bimetallic electrocatalyst for efficient oxygen evolution reaction

Abstract

Discovering of advanced electrocatalyst for water splitting is importance of the improvement of metal air batteries, water electrolyzers. The approach have been developed to fabricate a novel electrocatalyst with more active sites, high surface area and high porous structure for improve the electrocatalytic activity. Metal organic frameworks have been emerging catalyst of higher crystalline, large surface area, has delivering greater potential for efficient OER electrocatalytic activity. Bimetallic metal organic framework (MOFs) is an excellent catalyst for energy storage and energy conversion system. In this work, we report the synthesis of bimetallic MOF by single step solvothermal method using Ni, Cu as metal sources and BDC as a linker. FE-SEM images indicated NiCu-MOF a narrow crystal formation. The electrocatalyst study of the synthesized catalyst was systematically investigated by linear sweep voltammetery, electrochemical impedance spectroscopy and Chronoamprometry under OER condition. The result demonstrated that NiCu-MOF exhibited better catalytic activity towards OER at onset potential and overpotential of 1.48 V and 250 mV with lower tafel slope of 169 mV/dec, indicating that 25% lower energy required for OER. Hence the proposed NiCu-MOF catalyst is an efficient catalyst for sustainable oxygen evolution reaction.

Keywords

• Bimetallic MOF
• Electro-catalysis
• Linear sweep voltammetry
• Onset potential
• Overpotential