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N-doped Porous Carbon with ZIF-67-derived CoFe2O4-Fe Particles for Supercapacitors

JOURNAL OF COLLOID AND INTERFACE SCIENCE(2024)

Liaoning Key Lab of Lignocellulose Chemistry and Biomaterials

Cited 3|Views10
Abstract
The development of novel materials for electrodes with high energy densities is essential to the advancement of energy storage technologies. In this study, N-doped layered porous carbon with ZIF-67-derived binary CoFe2O4-Fe particles was successfully fabricated by the pyrolysis of an Fe-based chitosan (CS) hydrogel mixed with ZIF-67 particles. Various characterization techniques were employed to assess the performance of the prepared porous CoFe2O4-Fe@NC composite. This composite exhibits excellent performance owing to the effective combination of multivalent CoFe2O4-Fe particles derived from ZIF-67 with N-doped porous carbon substances with a high surface area, which helps to accelerate ion and charge transfer. The specific capacitance of the CoFe2O4-Fe@NC composite carbonized at 700 degrees C reached 3960.9F/g at 1 A/g. When this composite is combined with activated carbon (AC) to construct an asymmetric supercapacitor (ASC), a density of energy of up to 84.9 W h kg(-1) is attained at a power capacity of 291.6 W kg(-1). Moreover, this composite maintained a capacitance retention of up to 94.9 % after 10,000 cycles. This work offers new perspectives on high-performance supercapacitors and their applications.
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ZIF-67,CS,N-doped porous carbon,CoFe2O4-Fe@NC,Supercapacitor
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要点】:本研究成功制备了N掺杂的多孔碳材料,负载ZIF-67衍生的CoFe2O4-Fe双金属颗粒,用于超级电容器,实现了高能量密度和优异的循环稳定性。

方法】:通过将Fe基壳聚糖水凝胶与ZIF-67颗粒混合后进行热解,制备了N掺杂的多孔碳/CoFe2O4-Fe复合材料。

实验】:使用多种表征技术评估了所制备的CoFe2O4-Fe@NC复合材料的性能,700°C碳化后的复合材料在1 A/g的电流密度下具有3960.9 F/g的比电容,与活性炭组合构建的不对称超级电容器在291.6 W/kg的功率密度下,能量密度达到84.9 Wh/kg,并在10,000次循环后保持94.9%的电容保持率。