| Popis: |
Here, a bifunctional electocatalysts fabricated through a simple coprecipitation method on MOF precursor with micro/mesoporosity structure CoNi carbon nanotubes (Co/Ni/N-CNF). The as-prepared Co/Ni/N-CNF catalyst is essential to design and construct for enhancing the catalytic activity and vigorous durability simultaneously for ORR and OER. Significantly, the Co/Ni/N-CNF exhibits excellent oxygen reduction (ORR) electrocatalytic activity including onset potential (Eonset) and half-wave potential (E1/2) of 1.183 V and 0.82 V, which are comparable to commercial Pt/C-RuO2. Moreover, the constructed catalyst reveals lower operating voltage of 1.72 V at 10 mA cm− 2 (Ej=10), which is even superior to the commercial Pt/C-RuO2 . The signal activity can be ascribed to the synergetic effect between defect-riched N-doped carbon, porous structure and carbon nanotubes, which could induce notably dispersed active sites, superb conductivity, convenient electronic configuration, excellent durability and outstanding reaction pathways. Additionally, the catalyst with intelligent structure has a large surface area (269.703 m2 g−1), which is favourable for the exposure of catalytic active sites and mass transfer. This finding offers that developing the non-noble metal electrocatalyst to replace the noble metal electrocatalyst for practical applications of energy conversion and storage devices is possible. |
