Release time:2021-03-15  Hits:

• Key Words:Nanocatalysts;Cobalt - Crystalline materials - Doping (additives) - Electrocatalysts - Electrolytic reduction - Fuel cells - Metal nanoparticles - Metal-air batteries - Nanotubes - Nitrogen - Organometallics - Oxygen - Porous materials - Synthesis (chemical) - Transition metals
• Abstract:In this study, Co<inf>3</inf>O<inf>4</inf>/Co nanoparticles are synthesized within nitrogen-doped porous carbon/carbon nanotube matrix (Co<inf>3</inf>O<inf>4</inf>/Co@NC/CNT) by using ZIF-67 metal-organic frameworks. In comparison with commercial Pt/C catalysts, the composite exhibits better electrocatalytic characteristics for oxygen reduction reactions in alkaline media, such as onset potential, half-wave potential, current density, cycle stability, and methanol tolerance. For instance, onset potential and half-wave potential are positively shifted by 67 mV and 25 mV, respectively. Structural and composition analysis demonstrate that enhanced properties result from the formation of pyridinic nitrogen and Co-N-C active sites within carbon matrix. The findings above indicate that the Co<inf>3</inf>O<inf>4</inf>/Co@NC/CNT catalyst can replace expensive Pt/C catalyst for potential applications in fuel cells and metal-air batteries.<br/> © 2019 Elsevier B.V.
• Volume:851
• Issue:无
• Translation or Not:no