用于锂氧电池的量身定制的多孔ZnCo2O4纳米纤维电催化剂,Advanced Materials Interfaces

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用于锂氧电池的量身定制的多孔ZnCo2O4纳米纤维电催化剂
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2017-12-11 , DOI: 10.1002/admi.201701234
Jae-Chan Kim ₁ , Gwang-Hee Lee ₁ , Seun Lee ₁ , Seung-Ik Oh ₁ , Yongku Kang ₂ , Dong-Wan Kim ₁

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锂氧电池由于其极高的理论能量密度而被认为是下一代技术，尽管存在许多挑战，例如往返效率低和可循环性差。空气阴极的结构和孔隙特性在解决这些问题中起着关键作用。在这项研究中，我们制造了ZnCo ₂ O ₄纳米纤维，并使用便捷的静电纺丝工艺和选择性刻蚀ZnO作为锂氧电池的正极材料，设计了一种多孔纳米结构。首先，无孔ZnCo ₂ O ₄纳米纤维电极在500 mA g ^-1的电流密度下，在116个循环中具有1000 mA hg ^-1的有限容量，可实现高催化活性和良好的循环稳定性。。为了增强催化活性和循环能力，使用过量的Zn电纺丝溶液制备了包含ZnO的ZnCo ₂ O ₄纳米纤维，并通过选择性蚀刻ZnO制备了多孔ZnCo ₂ O ₄纳米纤维。多孔碳酸锌₂ ö ₄纳米级纤维电极显示出优异的电催化活性和可循环性为226次循环以1000mA Hg的能力有限^-1处的500毫安g的电流密度^-1。优异的催化性能解释了具有适当孔径的一维纳米结构和多孔结构的协同效应，在锂离子作用期间提供了较大的活性位点和有效的电子途径₂ O ₂形成/分解过程。

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Tailored Porous ZnCo2O4 Nanofibrous Electrocatalysts for Lithium–Oxygen Batteries

Lithium‐oxygen batteries are considered a next‐generation technology owing to their extremely high theoretical energy density despite many challenges such as low round‐trip efficiency and poor cyclability. The air‐cathode structure and pore properties play a key role in solving these problems. In this study, we fabricate ZnCo₂O₄ nanofibers and design a porous nanostructure using a facile electrospinning process and selective etching of ZnO as the cathode material in lithium‐oxygen batteries. First, non‐porous ZnCo₂O₄ nanofiber electrodes accomplish high catalytic activity and good cycling stability during 116 cycles with a limited capacity of 1000 mA h g⁻¹ at a current density of 500 mA g⁻¹. For enhanced catalytic activity and cyclability, ZnO included ZnCo₂O₄ nanofibers are prepared using a Zn‐excess electrospun solution and porous ZnCo₂O₄ nanofibers are fabricated via selective etching of ZnO. Porous ZnCo₂O₄ nanofiber electrodes exhibit excellent electrocatalytic activity and cyclability for 226 cycles with a limited capacity of 1000 mA h g⁻¹ at a current density of 500 mA g⁻¹. The exceptional catalytic properties explain the synergistic effect of the one‐dimensional nanostructure and porous structure with an appropriate pore diameter, providing a large active site and an efficient electron pathway during the Li₂O₂ formation/decomposition process.

更新日期：2017-12-11

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