生物废弃物衍生的碳纳米洋葱作为对称和铅碳混合超级电容器的有效电极材料,International Journal of Energy Research

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生物废弃物衍生的碳纳米洋葱作为对称和铅碳混合超级电容器的有效电极材料
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2022-05-23 , DOI: 10.1002/er.8123
Sadananda Muduli ₁ , Subir K. Pati ₁ , Surendra K. Martha ₁

Affiliation

近年来，碳和金属氧化物纳米复合材料作为电极材料被广泛研究，以开发能量和功率密集的超级电容器。然而，具有改进的孔隙率和功能部分的纳米碳是最环保和最具成本效益的超级电容器材料。在这项工作中，通过一步火焰烟灰收集法合成的碳纳米洋葱（CNOs），随后在惰性环境（CNO-600）中在 600°C 下煅烧，用作超级电容器的电极材料。CNO-600 s 具有逐层纳米洋葱结构，粒径约为 25 nm，Brunauer-Emmett-Teller 表面积为 147 m ² g ^-1。CNO-600在 0.5 A g ^{-1下提供 266 和 186 F g}^-1的电容分别用于半电池和对称超级电容器。_{超级电容器在 1 MH 2} SO ₄电解液中表现出 91% 的电容保持率和 20 000 次 GCD 循环。CNO-600 的稳定电容是由于电解质离子和电子在 CNO 的逐层结构中易于嵌入/脱嵌，有助于具有双电层电容器行为的赝电容电荷存储。_{使用 CNO-600 作为阳极材料和 PbO 2}作为阴极制造的铅碳混合超级电容器在 4.5 MH ₂ SO ₄中在 1 A g ^-1下提供 515 F g ^{-1的比电容}电解液在 2.3 和 0.6 V 的电压范围内。基于 CNO 的对称和铅碳混合系统中电荷存储的显着改善，为高性能超级电容器的发展提供了绝佳的机会。

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Bio-waste derived carbon nano-onions as an efficient electrode material for symmetric and lead-carbon hybrid ultracapacitors

Carbon and metal oxide nanocomposites have been extensively studied as electrode materials to develop energy and power-dense supercapacitors in recent years. Nevertheless, nano carbons with improved porosity and functional moieties are the most eco-friendly and cost-effective supercapacitor materials. In this work, carbon nano-onions (CNOs) synthesized by a single-step flame soot collection method, subsequently calcined at 600°C in an inert environment (CNO-600), are used as electrode material for the supercapacitors. CNO-600 s have a layer-by-layer nano onion structure with a ~25 nm particle size and a Brunauer–Emmett–Teller surface area of 147 m² g⁻¹. CNO-600 delivers 266 and 186 F g⁻¹ of capacitance at 0.5 A g⁻¹ for half cells and symmetric ultracapacitors, respectively. Ultracapacitors show capacitance retention of 91% with 20 000 GCD cycles in 1 M H₂SO₄ electrolyte. The stable capacitance of CNO-600 is due to easy intercalation/de-intercalation of electrolyte ions and electrons in the layer-by-layer structure of CNOs, contributing to pseudocapacitive charge storage with electric double layer capacitor behavior. The lead-carbon hybrid ultracapacitor fabricated using CNO-600 as anode material and PbO₂ as cathode delivers a specific capacitance of 515 F g⁻¹ at 1 A g⁻¹ in 4.5 M H₂SO₄ electrolyte in the voltage range of 2.3 and 0.6 V. The substantial improvement of charge storage in CNO-based symmetric and lead-carbon hybrid system, demonstrate an excellent opportunity for the development of high-performance supercapacitors.

更新日期：2022-05-23

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