Electrocatalysts’ activity in oxygen reduction reaction can be regarded as crucial indicator for their expected performance in metal-air battery, where catalyst selection is limited by low conductivity and insufficient electrochemical activity of available materials. This drawback could be addressed by the development of three-dimensional (3D) hierarchically structured carbon. In this study, hydrophobic 3D Fe/N/S doped graphene network is synthesized as electrocatalysts for zinc-air batteries in molten mixed salts (NaCl/FeCl₂). It was observed that NaCl could seal maximum possible quantity of N in 3D-N/S. This is accompanied by more pyridinic-N and graphitic-N groups being tailor made in 3D-Fe/N/S. When assembled as air breathing cathodes in zinc-air batteries, 3D-Fe/N/S material demonstrated open-circuit potential (OCP) of 1.507 V, which was more than 1.492 V in case of 3D-N/S and 1.489 V of 20% Pt/C. Similar pattern occurred at discharge current density 50 mA cm⁻² where a discharge voltage of 1.079 V observed in 3D-Fe/N/S was higher than 1.043 V of Pt/C and 1.040 V of 3D-N/S. Corresponding discharge power density maintained the same order, 3D-Fe/N/S (53.929 mW cm⁻²) > Pt/C (52.158 mW cm⁻²) > 3D-N/S (52.002 mW cm⁻²), rendering hydrophobic FeNx and N/S doped 3D-Fe/N/S better zinc-air battery electrode material than 20% Pt/C.

电催化剂在氧还原反应中的活性可以被认为是其在金属-空气电池中预期性能的关键指标，其中催化剂的选择受到电导率低和可用材料电化学活性不足的限制。可以通过开发三维（3D）层次结构碳来解决此缺点。在这项研究中，疏水性3D Fe / N / S掺杂的石墨烯网络被合成为熔融混合物盐（NaCl / FeCl ₂）。据观察，NaCl可以密封3D-N / S中最大可能的N量。这伴随着更多的3D-Fe / N / S量身定做的吡啶-N和石墨-N基团。将3D-Fe / N / S材料组装为锌-空气电池中的呼吸阴极时，其开路电势（OCP）为1.507 V，在3D-N / S和1.489 V的情况下高于1.492V。 20％Pt / C。在50mA cm ^-2的放电电流密度下发生类似的图案，其中在3D-Fe / N / S中观察到的1.079V的放电电压高于Pt / C的1.043V和3D-N / S的1.040V。相应的放电功率密度保持相同的顺序，即3D-Fe / N / S（53.929 mW cm ^-2）> Pt / C（52.158 mW cm ^-2）> 3D-N / S（52.002 mW cm ^-2）），使得疏水性FeNx和N / S掺杂的3D-Fe / N / S锌空气电池电极材料比20％Pt / C更好。