Long Xue, Xie Yuhua, Li Qing, Zhu Shiao, Chen Yazhou, Luo Fang, Yang Zehui
State Key Laboratory for Hubei New Textile Materials and Advanced Processing Technology, School of Materials Science and Engineering, Wuhan Textile University, 430200 Wuhan, China.
Faculty of Materials Science and Chemistry, China University of Geosciences Wuhan, Wuhan, 430074, China.
ACS Appl Mater Interfaces. 2024 Oct 2;16(39):52364-52372. doi: 10.1021/acsami.4c10727. Epub 2024 Sep 18.
The realization of a rechargeable zinc-air battery (ZAB) is hindered by the low intrinsic oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) activities. In this work, an abundant built-in electric field is noticed in a 1D/2D CoO/CoS heterostructure, triggering electron transfer from CoO to CoS associated with a downshifted d band center of the Co atom mitigating the strong electrochemical adsorption of *OH species on active sites; thereby, boosted OER and ORR performance are achieved. Namely, the OER specific activity of CoO/CoS is enhanced by 3.8- and 2.2-fold compared to the counterpart of CoO and CoS, respectively. Furthermore, the kinetic current density of CoO/CoS, a fingerprint of intrinsic ORR activity, is promoted by 46 and 6.6 times relative to CoO and CoS. The rechargeable ZAB performance attains 215.6 mW cm, 1.6-times better than Pt/C-IrO. Moreover, the superior performance remained for 600 h. Besides, the battery performance of the all-solid-state ZAB reaches 83.8 mW cm, revealing its promising application in wearable device.
可充电锌空气电池（ZAB）的实现受到低本征析氧反应（OER）和氧还原反应（ORR）活性的阻碍。在这项工作中，在一维/二维CoO/CoS异质结构中发现了丰富的内建电场，引发电子从CoO转移到CoS，同时Co原子的d带中心下移，减轻了*OH物种在活性位点上的强电化学吸附；从而实现了提高的OER和ORR性能。也就是说，CoO/CoS的OER比活性分别比CoO和CoS的对应物提高了3.8倍和2.2倍。此外，CoO/CoS的动力学电流密度（本征ORR活性的一个指标）相对于CoO和CoS分别提高了46倍和6.6倍。可充电ZAB的性能达到215.6 mW/cm²，比Pt/C-IrO好1.6倍。此外，优异性能保持了600小时。此外，全固态ZAB的电池性能达到83.8 mW/cm²，显示出其在可穿戴设备中的应用前景。
