Porous Co3O4 nanofibers applied as an efficient cathode catalyst for Li-air batteries
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摘要: 采用静电纺丝技术结合高温煅烧方法，以乙酰丙酮钴(Co(C5H7O2)3)为前驱物，制备了由Co3O4纳米颗粒组成的多孔纳米纤维(Co3O4 NFs)，其比表面积高达83 m2·g−1，并将制得的多孔Co3O4 NFs用于锂-空气电池催化剂。多孔Co3O4 NFs为电池反应提供了充足的活性位点及反应物的传输通道，有利于电池反应的顺利进行，使电池的放电容量得到极大地提高。另外，Co3O4催化剂的加入提高了电极的催化活性，较大程度降低了电池的过电位。值得注意的是，Co3O4催化剂的加入同时调控了锂-空气电池放电产物Li2O2的形貌，得到的放电产物Li2O2尺寸更小，在电极表面分布更为均匀，该形态的Li2O2在充电过程中更容易被分解，有利于提高电池的充电效率，同时电极的体积效应也可得到极大缓解。得益于以上优势，基于多孔Co3O4 NFs/炭黑Super P (Co3O4 NFs/SP)正极的锂-空气电池的电化学性能得到较大提高，50 mA·g−1电流密度下Co3O4 NFs/SP的放电容量高达10600 mA·h·g−1，电池可实现100次的充放电循环。Abstract: Porous Co3O4 nanofibers (Co3O4 NFs) composed with nanoparticles were fabricated by combining electrostatic spinning with subsequent calcination technology adopting Co(C5H7O2)3 as the precursor. The prepared porous Co3O4 NFs with specific surface area is up to 83 m2·g−1, which can be successfully used as an efficient catalyst in Li-air battery. Porous Co3O4 NFs provide sufficient active sites and transport channels for the battery reaction, which is favorable for the battery reaction and greatly improves the discharge capacity of the battery. In addition, the addition of Co3O4 catalyst also greatly promotes the catalytic activity of the cathode and reduces the over-potential of the Li-air battery. Significantly, with the addition of Co3O4 catalyst, the morphology of discharge product Li2O2 can also be regulated. Li2O2 with smaller size are uniformly distributed on the surface of cathode, which is more likely to be decomposed during the subsequent charging process. Additionally, the volume effect of the electrode is greatly alleviated. Because of the above-mentioned advantages, the electrochemical performances of porous Co3O4 NFs/Super P carbon (Co3O4 NFs/SP)-based Li-air battery have been greatly improved. The discharge capacity of Co3O4 NFs/SP is up to 10600 mA·h·g−1 at the current density of 50 mA·g−1, and 100 continuous discharge-charge cycles can be achieved.
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Key words:
- electrospinning technique /
- porous Co3O4 nanofibers /
- Li-air batteries /
- cathode /
- catalyst /
- discharge product
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图 1 多孔CO3O4纳米纤维(Co3O4 NFs)合成示意图
Figure 1. Synthesis strategy of porous Co3O4 nanofibers (Co3O4 NFs)
PVP—Polyvinylpyrrolidone
图 2 前驱物纳米纤维(a)和Co3O4 NFs (b)的SEM图像
Figure 2. SEM images of fabricated nanofibers (a) and Co3O4 NFs (b)
图 3 Co3O4 NFs的XRD图谱(a)和N2吸附-脱附等温曲线及孔径分布(b)
Figure 3. XRD pattern (a) and N2 adsorption-desorption isotherms and pore-size distribution (inset) (d) of porous Co3O4 NFs
图 4 SP和Co3O4 NFs/SP电极的锂-空气电池的首次充放电曲线(a)和循环伏安曲线(b)
Figure 4. First discharge-charge curves (a) and cyclic voltammetry curves (b) of Li-air batteries with Super P carbon (SP) and Co3O4 NFs/SP cathodes
图 5 SP (a)和Co3O4 NFs/SP电极(b)的锂-空气电池的充放电曲线及其循环性能(c)
Figure 5. Discharge-charge curves of Li-air batteries with SP (a) and Co3O4 NFs/SP (b) cathodes, and their corresponding cycling performances (c)
图 6 SP (a)和Co3O4 NFs/SP (b)电极的锂-空气电池的放电曲线及其放电容量(c)
Figure 6. Discharge curves of Li-air batteries with SP (a) and Co3O4 NFs/SP (b) cathodes, and corresponding discharge capacities (c)
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