Hierarchical core/shell Janus-type α-Fe2O3/PEDOT nanoparticles for high performance flexible energy storage devices
Hierarchical core/shell Janus-type α-Fe2O3/PEDOT nanoparticles for high performance flexible energy storage devices
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DOI：
10.1039/c6ta01369d
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发表时间：
2016-05
影响因子：
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通讯作者：
Jin Wook Park;Wonjoo Na;J. Jang
中科院分区：
文献类型：
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作者：
Jin Wook Park;Wonjoo Na;J. Jang
采用声化学法、液-液扩散辅助结晶法和气相沉积聚合法成功地合成了一类新型的层次化α-Fe_2O_3/聚(3，4-乙二氧基噻吩基)核/壳Janus型杂化纳米粒子。合成的α-Fe_2O_3/PEDOT HNPs具有大的比表面积、高的电导率、优异的电化学性能和高的化学稳定性。此外，α-Fe2O3/PEDOT HNPs降低了电解液离子的动态电阻，实现了高充放电倍率和高达2.0V的电池电压稳定扩展，从而实现了高性能的超级电容。这些结果归因于氧化铁(具有负工作电位窗口的核心结构)和PEDOT(具有正工作电位窗口的壳结构)之间的协同作用，导致比电容(252.8 F g−1)、能量(136.3 W h kg−1)和功率密度(10 526 W kg−1)的性能提高。1000次循环后，比电容保持率为92%。此外，利用水凝胶电解质成功制备了基于α-Fe_2O_3/PEDOT HNPs的柔性超级电容器。制造的全固态对称超级电容器即使在几次弯曲运动后也能产生优异的电化学和机械性能。
A new class of hierarchical α-Fe2O3/poly(3,4-ethylenedioxythiophene) (PEDOT) core/shell Janus-type hybrid nanoparticles (HNPs) was successfully synthesized using sonochemical, liquid–liquid diffusion-assisted crystallization, and vapor deposition polymerization methods. The synthesized α-Fe2O3/PEDOT HNPs exhibited several unique properties, including a large surface area, high conductivity, excellent electrochemical properties, and high chemical stability. In addition, the α-Fe2O3/PEDOT HNPs reduced the dynamic resistance of electrolyte ions, and enabled high charge–discharge rates and stable expansion of the cell voltage up to 2.0 V, thereby enabling high-performance supercapacitance. These results were attributed to synergetic effects between iron oxide (core structure with a negative working potential window) and PEDOT (shell structure with a positive working potential window), resulting in performance enhancements of specific capacitance (252.8 F g−1) and energy (136.3 W h kg−1) and power densities (10 526 W kg−1). The specific capacitance exhibited 92% retention after 1000 cycles. Additionally, a flexible supercapacitor based on the α-Fe2O3/PEDOT HNPs was successfully demonstrated using a hydrogel electrolyte. The fabricated all-solid-state symmetrical supercapacitor produced superior electrochemical and mechanical performance, even after several bending motions.