Uniform Fe_xNi_y Nanospheres: Cost-Effective Electrocatalysts for Nonaqueous Rechargeable Li–O₂ Batteries

Uniform Fe_xNi_y nanospheres were synthesized via a simple solvothermal method and used as electrocatalysts for Li–O₂ batteries. Fe₇Ni₃ nanospheres exhibited relatively high catalytic activities in the electrochemical tests. They delivered a reversible capacity of more than 7000 mAh/g_KB and gave a discharge–charge voltage gap reduction of 250 mV compared with Ketjen Black.