静电纺丝制备Co/碳纤维自支撑膜用于锌-空电池正极

Carbon fibers loaded with Co nanoparticles prepared by electrospinning as self-supporting cathode materials for Zn-air batteries

商用Pt基氧还原反应催化剂稳定性差和生产成本高等缺点,导致锌-空电池等绿色高效的新型能源发展受到限制。因此,开发高效、廉价、耐用的氧还原电催化剂成为电催化领域的研究热点。利用静电纺丝技术制备了Co负载的碳纤维柔性自支撑膜(Co/CNF),通过扫描电子显微镜、X-射线衍射和N_(2)吸附-脱附等对其形貌和结构进行了表征。在0.1 mol·L^(-1) KOH电解液中,Co/CNF具有优异氧还原反应活性及稳定性,其起始电位和半波电位分别为0.92和0.84 V,经过10 000次循环性能没有明显衰减。以Co/CNF作为空气正极组装锌-空电池,其开路电压为1.46 V、峰值功率密度为185 mW·cm^(-2),能够稳定运行近80 h,性能优于商业Pt/C催化剂。

Due to the poor stability and high cost of commercial Pt-based catalysts for oxygen reduction reaction(ORR),the development of novel,green and efficient energy sources such as Zn-air batteries is extremely slow.Therefore,the development of efficient,cheap,and durable electrocatalysts for ORR has become a research hotspot in electrocatalysis.Co loaded carbon fiber flexible self-supporting film(Co/CNF)was prepared by electrospinning technology.The morphology and structure were characterized by scanning electron microscope,X-ray diffraction pattern and N_(2) adsorption-desorption isothermal curve.In 0.1 mol·L^(-1) KOH electrolyte,Co/CNF exhibits excellent ORR activity and stability with onset potential of 0.92 V and half potential of 0.84 V.Moreover,the performance displays no obvious degradation after 10000 cycles.The Zn-air battery assembled by Co/CNF as air-cathode performs an open circuit voltage of 1.46 V,a maximum power density of 185 mW·cm^(-2),and can stably operate for nearly 80 h,which is superior to that of commercial Pt/C catalyst.