No abstract

In the oxygen reduction reaction (ORR), the oxygen transport rate plays an important role in the ORR on the cathode. An approach by applying magnetic fields on the cathode can effectively improve the oxygen transport. However, no work reports the effect of the magnetism of ferromagnetic catalysts on ORR under an external magnetic field. Herein, the catalytic performances of the ferromagnetic catalysts including Fe 3 O 4 , γ-Fe 2 O 3 , and Fe-N-C for ORR are studied under an external magnetic field. Linear sweep voltammetry (LSV) results indicate that the ORR current on the cathode increases with the strength of the external magnetic field due to the improved oxygen transfer. Meanwhile, the increase of the ORR current on Fe-N-C is larger than Fe 3 O 4 and γ-Fe 2 O 3 since some internal tiny magnetic fields generated by the Fe 3 O 4 and γ-Fe 2 O 3 catalysts are different from the magnetic direction of the external magnet. It is also found that the magnetic direction of the external magnet does not have any effect on the oxygen transfer.

Nano-chain amorphous CoB@porous Ni(OH)2 ultrathin sheets is developed, which has high specific capacitance, rate capability and long-term capacity. These particles, through their chain-like core and porous ultrathin sheets, thus afford a promising target structure for supercapacitor materials.

No abstract