高效可充电锌-空气电池用碳纳米管宏观膜上的再活化铁纳米颗粒

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Pub Date : 2025-05-12 DOI:10.1016/j.carbon.2025.120425

Bing Qian , Ting Liu , Zhaolu Pu , Ruiqi Wang , Chengqin Pan , Yulong Sun , Zhixiang Wang , Yanhong Yin , Xianbin Liu , Ziping Wu

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引用次数: 0

摘要

可充电锌空气电池（ZABs）具有高能量密度、安全、环保等优点，在下一代可持续能源存储领域具有巨大潜力。然而，空气阴极的缓慢动力学阻碍了它们的能量效率和循环稳定性。在此，我们报告了一种桥接策略来制造独立空气阴极（NCNTs-Fe/CMF），由包裹在n掺杂碳纳米管（NCNTs-Fe）上的交联和互连的铁纳米颗粒（NPs）组成，这些纳米颗粒紧密结合在碳纳米管宏观膜（Fe/CMF）底物上以激活铁NPs位点。NCNTs-Fe/CMF的桥接效应使其具有良好的界面接触、较大的比表面积和高导电性，加速了电子传递，促进了氧的传质/扩散。此外，活化的Fe NPs与n掺杂之间的协同作用丰富了丰富的氮物质，进一步促进了电催化过程。结果表明，NCNTs-Fe/CMF具有优异的双功能催化活性，在10 mA cm−2下的半波电位为0.88 V，过电位为340 mV。此外，基于NCNTs-Fe/CMF空气阴极组装的可充电ZAB具有令人满意的130.0 mW cm - 2的功率密度和出色的循环耐久性，在5 mA cm - 2下可达200小时。这项工作为开发高效稳定的独立空气电极提供了一种桥接设计策略。

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Reactivated Fe nanoparticles on carbon nanotube macro film for high-efficiency rechargeable zinc-air batteries

Rechargeable zinc-air batteries (ZABs) hold great potential in next-generation sustainable energy storage because of their high energy density, safety, and environmental friendliness. Nevertheless, the sluggish kinetics of the air cathode hinder their energy efficiency and cycling stability. Herein, we report a bridging strategy to fabricate a free-standing air cathode (NCNTs-Fe/CMF), consisting of the crosslinked and interconnected Fe nanoparticles (NPs) encapsulated on the N-doped carbon nanotubes (NCNTs-Fe), which are tightly bound to a carbon nanotube macro film (Fe/CMF) substrate to activate Fe NPs sites. The bridging effect of NCNTs-Fe/CMF endows excellent interfacial contact, a large specific surface area, and high electrical conductivity, accelerating electron transfer and promoting oxygen mass transfer/diffusion. In addition, the synergy between activated Fe NPs and N-doping enriches abundant nitrogen species, further facilitating the electrocatalytic process. As a result, the NCNTs-Fe/CMF exhibits excellent bifunctional catalytic activity, featuring a half-wave potential of 0.88 V and an overpotential of 340 mV at 10 mA cm⁻². Furthermore, the assembled rechargeable ZAB based on the NCNTs-Fe/CMF air cathode delivers a satisfactory power density of 130.0 mW cm⁻² and outstanding cycling durability up to 200 h at 5 mA cm⁻². This work provides a bridging design strategy for developing highly efficient and stable free-standing air electrodes.

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来源期刊

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

期刊介绍： The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.