Synthesis of Metal-Organic Framework-Derived Carbon Supported CoFe 2 O 4 with Enhanced Oxygen Reduction Reaction Catalytic Properties

Fe 2 Co-MOF is prepared through a simple hydrothermal reaction and calcination at 600 o C for 2 h under N 2 atmosphere. Then heating at 300 o C for 2 h under air, a new composite catalyst CoFe 2 O 4 @carbon nanorods (CoFe 2 O 4 @CNR) is obtained. The composite structure can effectively alleviate the agglomeration of metal particles, make transition metal nanoparticles uniformly dispersed on graphitized carbon under the action of non-covalent bonds. Compared with traditional spinel structure compound CoFe 2 O 4 , the CoFe 2 O 4 @CNR nanocomposite shows excellent oxygen reduction reaction performances with an onset potential of -0.2 V vs. Ag/AgCl, a half-wave potential of -0.34 V, and a diffusion-limited current density of 5.05 mA.cm -2 , which are better than CoFe 2 O 4 with obvious superior difference of 100 mV, 90 mV and 3.07 mA.cm -2 , respectively.