Earth-abundant magnetite with carbon coatings as reversible cathodes for stretchable zinc-ion batteries

Earth-abundant magnetite(Fe_(3)O_(4))as cathode materials in aqueous zinc-ion batteries(ZIBs)is limited by its very low capacity and poor cycling.Here,a combined strategy based on carbon coating and electrolyte optimization is adopted to improve the performance of Fe_(3)O_(4).The Zn-Fe_(3)O_(4)@C batteries display specific capacities of 93 mAh g^(−1) and 81%capacity retention after 200 cycles.Such performance is attributed to the enhanced electrical conductivity and structural stability of Fe_(3)O_(4)@C nanocomposites with suppressed iron dissolution.Experimental analysis reveals that the charge storage is contributed by diffusion-limited redox reactions and surface-controlled pseudocapacitance.A stretchable Zn-Fe_(3)O_(4)@C battery is further fabricated,showing stable performance when it is bent or stretched.Fe_(3)O_(4) is a promising cathode material for cost-effective,safe,sustainable and wearable energy supplies.

仿生学中介电聚合物复合材料的研究进展

自然结构、自然现象、动植物形态和人类行为总是给我们提供灵感,激发更多的创造力.可用于制造人工肌肉的介电聚合物复合材料的设计与应用在仿生学领域显示出巨大的潜力.然而,其仍然面临着巨大的挑战,严重阻碍了介电聚合物复合材料的发展.本文系统地综述了近年来自然启发的具有优异性能的单层和多层介电聚合物复合材料的研究进展,并对其结构和特性进行了描述.此外,我们进一步讨论了这种复合材料在集成系统中的应用,包括仿生机器人、医疗保健和生物医学应用.此外,我们还深入分析了这一领域的挑战和前景.模仿自然已经成为介电聚合物复合材料设计和应用的关键.我们相信这种方法将推动智能和医疗行业的持续进步.