Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China.
School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China.
Adv Mater. 2018 Nov;30(46):e1804653. doi: 10.1002/adma.201804653. Epub 2018 Oct 4.
Zinc-air batteries offer a possible solution for large-scale energy storage due to their superhigh theoretical energy density, reliable safety, low cost, and long durability. However, their widespread application is hindered by low power density. Herein, a multiscale structural engineering of Ni-doped CoO nanosheets (NSs) for zinc-air batteries with superior high power density/energy density and durability is reported for the first time. In micro- and nanoscale, robust 2D architecture together with numerous nanopores inside the nanosheets provides an advantageous micro/nanostructured surface for O diffusion and a high electrocatalytic active surface area. In atomic scale, Ni doping significantly enhances the intrinsic oxygen reduction reaction activity per active site. As a result of controlled multiscale structure, the primary zinc-air battery with engineered Ni-doped CoO NSs electrode shows excellent performance with a record-high discharge peak power density of 377 mW cm , and works stable for >400 h at 5 mA cm . Rechargeable zinc-air battery based on Ni-doped CoO NSs affords an unprecedented small charge-discharge voltage of 0.63 V, outperforming state-of-the-art Pt/C catalyst-based device. Moreover, it is shown that Ni-doped CoO NSs assembled into all-solid-state coin cells can power 17 light-emitting diodes and charge an iPhone 7 mobile phone.
锌空气电池因其超高的理论能量密度、可靠的安全性、低成本和长耐久性而成为大规模储能的一种可行解决方案。然而，其广泛应用受到低功率密度的限制。本文首次报道了一种用于锌空气电池的具有优异的高功率密度/能量密度和耐久性的 Ni 掺杂 CoO 纳米片（NSs）的多尺度结构工程。在微纳尺度上，坚固的二维结构和纳米片中的大量纳米孔为 O 扩散提供了有利的微纳结构表面和高电催化活性表面积。在原子尺度上，Ni 掺杂显著提高了每个活性位点的本征氧还原反应活性。由于控制了多尺度结构，具有工程化 Ni 掺杂 CoO NSs 电极的初级锌空气电池表现出优异的性能，具有创纪录的高放电峰值功率密度 377 mW cm ，在 5 mA cm 下稳定工作超过 400 h。基于 Ni 掺杂 CoO NSs 的可充电锌空气电池提供了前所未有的小充放电电压 0.63 V，优于最先进的基于 Pt/C 催化剂的设备。此外，还表明组装成全固态硬币电池的 Ni 掺杂 CoO NSs 可以为 17 个发光二极管供电，并为 iPhone 7 手机充电。
