| 초록 |
The metal-air batteries are spotlighted as renewable energy storage system, because it has unlimited resources to use oxygen and their high theoretical energy density performance. However, the undesirable sluggish ORR & OER kinetics are main challenged to be solved. Here, we report the 3D material with a high catalytic activity site, which has not been reported previously, a carbon chain structure connected by a cobalt single atom. Tangled & twisted structure has a meso- to macro- porous characteristic, which provides a three-phases (gas/oxygen-liquid/electrolyte-solid/catalyst) coexist space that is advantageous for oxygen adsorption and desorption reaction. In addition, the single atom scale can control previous uncontrolled metal- supported bonds. Co, which has lost its charge to N, becomes more oxidized and has a higher potential as a bifunctional catalyst. Therefore, these fresh cathodic catalysts with metal-air battery may suggest the new direction and paradigm. |
