Preparation of low internal resistance electrode material with multistage interconnected pores from coffee grounds

IF 23.2 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Advanced Composites and Hybrid Materials Pub Date : 2024-03-01 DOI:10.1007/s42114-024-00858-x

Bin Li, Jian Li, Minghui Guo

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Abstract

Using biomass waste materials to prepare electrode materials with excellent properties is an effective strategy for solving current energy and environmental problems. In this work, coffee grounds were pretreated with Co(NO₃)₂ and Ni(NO₃)₂, then KOH was used to activate the pretreated coffee grounds at a high temperature to obtain a foam-like electrode material with interconnected microporous-mesoporous-macroporous hierarchical channels. This preparation method is simple and has low energy consumption, and the resulting material has an ultra-low internal resistance of 0.31 Ω. The specific capacitance of CGC-2 is 302.65 F g⁻¹ at a current density of 1 A g⁻¹. The low internal resistance and high electrical conductivity of this activated material are attributed to the presence of Co²⁺ and Ni²⁺ during carbonization, whose catalytic effect leads to a relatively ordered lattice structure. The interconnected structure of the final product is mainly caused by the strong activation function of KOH generating many pores. The prepared material exhibits good rate performance and cycling stability, and it has a Coulombic efficiency of nearly 93%. This work provides a novel idea for using biomass materials to fabricate high-performance electrode materials for supercapacitors.

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用咖啡渣制备具有多级互联孔隙的低内阻电极材料

利用生物质废料制备性能优异的电极材料是解决当前能源和环境问题的有效策略。在这项研究中，先用Co(NO3)2和Ni(NO3)2对咖啡渣进行预处理，然后用KOH对预处理后的咖啡渣进行高温活化，得到一种具有微孔-介孔-大孔分层互联通道的泡沫状电极材料。CGC-2 的比电容为 302.65 F g-1，电流密度为 1 A g-1。这种活性材料的低内阻和高导电性归功于碳化过程中 Co2+ 和 Ni2+ 的存在，它们的催化作用导致了相对有序的晶格结构。最终产品的互连结构主要是由于 KOH 的强活化功能产生了许多孔隙。制备的材料具有良好的速率性能和循环稳定性，库仑效率接近 93%。这项工作为利用生物质材料制造高性能超级电容器电极材料提供了一个新思路。图文摘要

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来源期刊

Advanced Composites and Hybrid Materials Multiple-

CiteScore

26.00

自引率

21.40%

发文量

185

期刊介绍： Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.