Xu Yan, Zhang Bo, Ran Jiaqi, Liu Peitao, Gao Daqiang
Physics and Electronic Engineering Department, Xinxiang University, Xinxiang 453003, People's Republic of China.
Nanotechnology. 2020 Apr 9;31(26):265402. doi: 10.1088/1361-6528/ab7ef9. Epub 2020 Mar 11.
Exploring efficient and durable bifunctional catalysts in pH-universal media is critical for versatile fuel cells. Herein, Fe-based species anchored on N-doped carbon nanotubes (Fe/FeC@N-C) are used for bifunctional oxygen electrocatalysts. The composite electrocatalyst exhibits low potential gaps (ΔE, ΔE = E - E ) in a pH-universal environment. The estimated values are about 0.70, 1.07,and 1.10 V in alkaline, neutral, and acidic medias. A neutral Zn-air battery (ZAB) is constructed using an Fe/FeC@N-C composite as the air electrode, which exhibits a favorable performance in energy storage with an open-circuit potential (OCP) of 1.42 V and a high power density of 80 mW cm. The ZAB also has superior cycling stability with only a 0.5% decay after 1200 charge-discharge cycles at 2 mA cm. While the assembled ZAB in acidic media indicates an OCP of 1.40 V, a power density of 23 mW cm, and 612 discharge-charge cycles. The ZAB is rechargeable and has a cycling lifespan of 120 h. This work provides potential applications of Fe/FeC@N-C as air electrodes for advanced pH-universal media based on ZABs for future energy storage devices.
在pH通用介质中探索高效耐用的双功能催化剂对于多功能燃料电池至关重要。在此，锚定在氮掺杂碳纳米管上的铁基物种（Fe/FeC@N-C）被用作双功能氧电催化剂。该复合电催化剂在pH通用环境中表现出低电位差（ΔE，ΔE = E - E ）。在碱性、中性和酸性介质中的估计值分别约为0.70、1.07和1.10 V。使用Fe/FeC@N-C复合材料作为空气电极构建了中性锌空气电池（ZAB），其在储能方面表现出良好的性能，开路电位（OCP）为1.42 V，高功率密度为80 mW cm 。该ZAB还具有优异的循环稳定性，在2 mA cm 下进行1200次充放电循环后仅衰减0.5%。而在酸性介质中组装的ZAB的开路电位为1.40 V，功率密度为23 mW cm ，充放电循环次数为612次。该ZAB可充电，循环寿命为120 h。这项工作为Fe/FeC@N-C作为基于ZAB的先进pH通用介质的空气电极在未来储能装置中的潜在应用提供了依据。
