Yu Fengjiao, Ying Qi, Ni Shaofeng, Li Chenxue, Xue Daxiang, Yang Yang
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
Dalton Trans. 2021 Nov 16;50(44):16185-16190. doi: 10.1039/d1dt02787e.
Large-scale application of rechargeable Zn-air batteries requires low-cost electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) as alternatives to noble metals. Herein, FeCo nanoparticles embedded in N-doped carbon (FeCo/N-C) were prepared by a two-step pyrolysis route. FeCo/N-C exhibits excellent activities toward both the ORR (half-wave potential of 0.84 V) and OER (overpotential of 345 mV at 10 mA cm), which are comparable to those of commercial Pt/C and RuO, and by far exceeding their counterparts Fe/N-C and Co/N-C. Furthermore, the FeCo/N-C catalyst was evaluated in a rechargeable Zn-air battery for the full-cell test. The FeCo/N-C based battery is more durable with a smaller round-trip overpotential after 800 cycles than the battery using an expensive Pt/C + RuO mixture catalyst.
可充电锌空气电池的大规模应用需要低成本的氧还原反应（ORR）和析氧反应（OER）电催化剂来替代贵金属。在此，通过两步热解路线制备了嵌入氮掺杂碳中的FeCo纳米颗粒（FeCo/N-C）。FeCo/N-C对ORR（半波电位为0.84 V）和OER（在10 mA cm时过电位为345 mV）均表现出优异的活性，与商业Pt/C和RuO相当，且远远超过其对应物Fe/N-C和Co/N-C。此外，对FeCo/N-C催化剂在可充电锌空气电池中进行了全电池测试评估。基于FeCo/N-C的电池比使用昂贵的Pt/C + RuO混合催化剂的电池更耐用，在800次循环后具有更小的往返过电位。
