Liu Hang, Mai Zhongwen, Xu Xinxin, Wang Yi
Department of Chemistry, College of Science, Northeast University, Shenyang, 110819, P.R. China.
Dalton Trans. 2020 Mar 3;49(9):2880-2887. doi: 10.1039/c9dt04682h.
Through the integration of Zn-Co3O4 and Zn-air batteries at the cell level, a hybrid battery was assembled, which possessed a higher voltage and power density than a common Zn-air battery. In this hybrid battery, the cathode material is composed of oxygen-vacancy-rich Co3O4-x and N, S-co-doped carbon derived from a metal-organic framework; a Zn plate acts as the anode. With a current of 1 A g-1, the specific capacity of the cathode material achieves 144 mA h g-1. A four-electron process dominates the oxygen reduction reaction of the cathode material with a half wave potential of 0.78 V. In the oxygen evolution reaction, the η10 potential of the cathode material is merely 365 mV. When discharged at 1 mA cm-2, the hybrid Zn battery shows two discharge plateaus at 1.75 V and 1.11 V. Its specific capacity and energy density reach 711 mA h g-1 and 810 W h kg-1, respectively. This battery also inherits superior power density from the Zn-Co3O4 battery. Its peak power density occurs at 43.6 mW cm-2, and this value is obviously higher than that of the Zn-air battery built from the same cathode material. The hybrid battery also exhibits excellent stability with a capacity and charge-discharge voltage that are well maintained after long time periods. This study integrates two distinct batteries into one power source to develop a hybrid Zn battery, which possesses high voltage, specific capacity and superior power and energy densities.
通过在电池层面将Zn-Co3O4与锌空气电池集成，组装了一种混合电池，其电压和功率密度高于普通锌空气电池。在这种混合电池中，阴极材料由富含氧空位的Co3O4-x和源自金属有机框架的N、S共掺杂碳组成；锌板用作阳极。在1 A g-1的电流下，阴极材料的比容量达到144 mA h g-1。阴极材料的氧还原反应以四电子过程为主，半波电位为0.78 V。在析氧反应中，阴极材料的η10电位仅为365 mV。当以1 mA cm-2放电时，混合锌电池在1.75 V和1.11 V处显示出两个放电平台。其比容量和能量密度分别达到711 mA h g-1和810 W h kg-1。该电池还继承了Zn-Co3O4电池卓越的功率密度。其峰值功率密度出现在43.6 mW cm-2，该值明显高于由相同阴极材料构建的锌空气电池。混合电池还表现出优异的稳定性，长时间后容量和充放电电压保持良好。本研究将两种不同的电池集成到一个电源中，开发出一种具有高电压、比容量以及卓越功率和能量密度的混合锌电池。
