纳米纤维状LSCF@GDC复合氧电极在可逆固体氧化物燃料电池中的应用

Application of Nanofibrous LSCF@GDC Composite Oxygen Electrodes in Reversible Solid Oxide Fuel Cells

摘要:

可逆固体氧化物燃料电池（reversible solid oxide fuel cell, RSOFC）在理论层面能实现较高的能量转换效率，进一步提升电流密度以增加产氢量和输出电流是其广泛应用的要点。然而，氧电极催化活性不足已成为可逆固体氧化物电池应用的阻碍。本实验运用静电纺丝技术制备了具有可逆氧析出/还原电催化活性的复合型La_0.4Sr_0.6Co_0.2Fe_0.8O_3-δ (LSCF) @ (Ce_0.80Gd_0.20)O_2-δ(GDC)纳米纤维。结果表明，相较于传统溶胶-凝胶法合成的氧电极材料，本研究的三维纳米纤维结构氧电极大幅降低了电池极化阻抗，提升了放电功率密度和电解电流密度，并在长期测试中呈现出较好的可逆性和稳定性，证实了电极形貌工程调控在扩大催化界面和反应位点方面的优势。

Abstract:

Reversible solid oxide fuel cell (RSOFC) can theoretically achieve a relatively high energy conversion efficiency. The key to its widespread application is the increased hydrogen production and output current by further enhancing the current density. However, insufficient catalytic activity of the oxygen electrodes has become an obstacle to the application of RSOFC. The research successfully prepared the composite LSCF@GDC nanofibers with reversible oxygen evolution and reduction electrocatalytic activity synthesized by electrospinning technique. Results show that, compared with the oxygen electrodes materials synthesized by the traditional sol-gel method, the oxygen electrodes with three-dimensional nanofiber structure in this work described greatly reduces the battery polarization impedance, increases the discharge power density and electrolytic current density, and shows better reversibility and stability in long-term tests. This research confirms the advantage of electrode morphology engineering control in expanding the catalytic interface and reaction sites.