Lei-Chao Meng, Hao Zhang, Le Kang, Yi Zhang, Neng-Fei Yu, Fan Zhang, Hui-Ling Du
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引用次数: 0
摘要
设计具有高活性、高稳定性和低成本的双功能氧还原/进化(ORR/OER)催化剂是加速可充电锌空气电池(RZAB)商业化的关键。在此,我们提出了一种模板辅助电纺丝策略,以原位制造由嵌入 N 掺杂中空多孔碳纳米球(FeNi@NHCFs)的 FeNi 纳米颗粒组成的三维纤维,作为 RZAB 中稳定的无粘结剂集成空气阴极。三维相互连接的导电纤维网络提供了快速的电子传输途径,并增强了机械灵活性。同时,掺杂 N 的中空多孔碳纳米球不仅能均匀地约束镍铁纳米颗粒,提供足够的催化活性位点,还能提供最佳的传质环境,降低扩散阻力。由 FeNi@NHCFs 组装成的 RZABs 作为集成空气阴极,具有开路电压高、放电比容量和功率密度大、持久循环稳定性和灵活性强等优异的电池性能。因此,这项工作为金属空气电池及其他相关领域提供了一种不使用任何聚合物粘合剂制造集成电极的有用策略。
Robust and flexible 3D integrated FeNi@NHCFs air electrode for high-performance rechargeable zinc-air battery
Designing bifunctional oxygen reduction/evolution (ORR/OER) catalysts with high activity, robust stability and low cost is the key to accelerating the commercialization of rechargeable zinc-air battery (RZAB). Here, we propose a template-assisted electrospinning strategy to in situ fabricate 3D fibers consisting of FeNi nanoparticles embedded into N-doped hollow porous carbon nanospheres (FeNi@NHCFs) as the stable binder-free integrated air cathode in RZAB. 3D interconnected conductive fiber networks provide fast electron transfer pathways and strengthen the mechanical flexibility. Meanwhile, N-doped hollow porous carbon nanospheres not only evenly confine FeNi nanoparticles to provide sufficient catalytic active sites, but also endow optimum mass transfer environment to reduce diffusion barrier. The RZABs assembled by FeNi@NHCFs as integrated air cathodes exhibit outstanding battery performance with high open-circuit voltage, large discharge specific capacity and power density, durable cyclic stability and great flexibility. Thus, this work brings a useful strategy to fabricate the integrated electrodes without using any polymeric binders for metal air batteries and other related fields.
期刊介绍:
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.