木质素废弃物的高效转化及高能量密度不对称超级电容器C@MnCo2O4的自组装合成

IF 10.7 1区 工程技术 Q1 CHEMISTRY, PHYSICAL
Jiahui Mu, Cuihuan Li, Jiankang Zhang, Xianliang Song, Sheng Chen, Feng Xu
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引用次数: 0

摘要

造纸和生物炼制行业的木质素废物是一种非常有前途的可再生资源,可用于制备各种应用的先进碳材料,如超级电容器的电极;然而,提高它们的能量密度仍然是一个挑战。在这里,我们设计了一种绿色通用的方法来制备复合电极材料,该材料由木质素酚醛树脂衍生的分级多孔碳(LR-HPC)作为导电骨架和自组装的钴酸锰(MnCo2O4)纳米晶体作为活性位点组成。合成的C@MnCo2O4复合材料具有丰富的多孔结构和优异的电子导电性,为氧化还原反应提供了更多的电荷/电子传质通道和活性位点。由于LR-HPC和MnCo2O4晶体之间的交互界面显著增强,该复合材料显示出优异的电化学性能,例如在0.5 mV s−1时的最大比电容为~726 mF cm−2。组装的全固态不对称超级电容器,分别以LR-HPC和C@MnCo2O4为阴极和阳极,在8.2 mW cm−3的功率密度下,表现出0.68 mWh cm−3最高的体积能量密度。此外,该设备在5000次循环后,在5 mA cm−2下显示出高容量保持率~87.6%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Efficient conversion of lignin waste and self-assembly synthesis of C@MnCo2O4 for asymmetric supercapacitors with high energy density

Efficient conversion of lignin waste and self-assembly synthesis of C@MnCo2O4 for asymmetric supercapacitors with high energy density

Lignin waste from the papermaking and biorefineries industry is a significantly promising renewable resource to prepare advanced carbon materials for diverse applications, such as the electrodes of supercapacitors; however, the improvement of their energy density remains a challenge. Here, we design a green and universal approach to prepare the composite electrode material, which is composed of lignin-phenol-formaldehyde resins derived hierarchical porous carbon (LR-HPC) as conductive skeletons and the self-assembly manganese cobaltite (MnCo2O4) nanocrystals as active sites. The synthesized C@MnCo2O4 composite has an abundant porous structure and superior electronic conductivity, allowing for more charge/electron mass transfer channels and active sites for the redox reactions. The composite shows excellent electrochemical performance, such as the maximum specific capacitance of ∼726 mF cm−2 at 0.5 mV s−1, due to the significantly enhanced interactive interface between LR-HPC and MnCo2O4 crystals. The assembled all-solid-state asymmetric supercapacitor, with the LR-HPC and C@MnCo2O4 as cathode and anode, respectively, exhibits the highest volumetric energy density of 0.68 mWh cm−3 at a power density of 8.2 mW cm−3. Moreover, this device shows a high capacity retention ratio of ∼87.6% at 5 mA cm−2 after 5000 cycles.

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来源期刊
Green Energy & Environment
Green Energy & Environment Energy-Renewable Energy, Sustainability and the Environment
CiteScore
16.80
自引率
3.80%
发文量
332
审稿时长
12 days
期刊介绍: Green Energy & Environment (GEE) is an internationally recognized journal that undergoes a rigorous peer-review process. It focuses on interdisciplinary research related to green energy and the environment, covering a wide range of topics including biofuel and bioenergy, energy storage and networks, catalysis for sustainable processes, and materials for energy and the environment. GEE has a broad scope and encourages the submission of original and innovative research in both fundamental and engineering fields. Additionally, GEE serves as a platform for discussions, summaries, reviews, and previews of the impact of green energy on the eco-environment.
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