Manganese and Cobalt Heterostructures in Carbon Aerogels for the Improved Electrochemical Performance of Supercapacitors

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY ACS Applied Nano Materials Pub Date : 2024-09-19 DOI:10.1021/acsanm.4c01802

Xiaochan Liu, Tingwei Wang, Xibin Yi, Jing Zhang, Xinfu Zhao, Sijia Liu, Sheng Cui

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Abstract

The structural characteristics of electrodes are very important for supercapacitors (SCs) to improve their performance. Introducing transition metals in carbon aerogels (CAs) is an effective way to boost the application of supercapacitors. We develop a simple method to introduce two kinds of transition metals in a CA in one synthesis step, denoted MnCo/CA. There are small-sized Co nanocrystals and MnO₂ generated in situ, which not only produce abundant heterointerfaces but also enhance the specific surface area of the CA. Thanks to hierarchical porous structures and various MnO₂/Co/C heterostructure interfaces, the obtained MnCo/CA nanomaterials exhibit an excellent capacitance of 395.9 ± 5.0% F/g under 1.0 A/g, an outstanding rate capacity of 130.8 ± 3.0% F/g under 25.0 A/g, and a superior cycle life of 74.0% after 5000 cycles. Noticeably, benefiting from synergistic effects among metallic cobalt, manganese oxide, and CA, the MnCo/CA//MnCo/CA double-electrode supercapacitor presents a large voltage window (2.5 V) and then reaches a higher energy density of 63.1 ± 1.0% Wh/kg at 312.5 ± 5.0% W/kg. This research emphasizes the synergy effect between metal/metal and metal/carbon in CAs, which offers a simple way for advanced SC electrode materials.

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电极的结构特征对于超级电容器（SC）提高性能非常重要。在碳气凝胶（CA）中引入过渡金属是促进超级电容器应用的有效方法。我们开发了一种简单的方法，在一个合成步骤中将两种过渡金属引入到碳气凝胶中，命名为 MnCo/CA。原位生成的小尺寸 Co 纳米晶体和 MnO2 不仅能产生丰富的异质界面，还能提高 CA 的比表面积。由于具有分层多孔结构和各种 MnO2/Co/C 异质界面，所获得的 MnCo/CA 纳米材料在 1.0 A/g 下具有 395.9 ± 5.0% F/g 的出色电容，在 25.0 A/g 下具有 130.8 ± 3.0% F/g 的出色速率容量，并且在 5000 次循环后具有 74.0% 的超长循环寿命。值得注意的是，得益于金属钴、氧化锰和 CA 之间的协同效应，MnCo/CA//MnCo/CA 双电极超级电容器呈现出较大的电压窗口（2.5 V），并在 312.5 ± 5.0% W/kg 的条件下达到较高的能量密度（63.1 ± 1.0% Wh/kg）。这项研究强调了 CA 中金属/金属和金属/碳之间的协同效应，为先进的 SC 电极材料提供了一条简单的途径。

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来源期刊

ACS Applied Nano Materials Multiple-

CiteScore

8.30

自引率

3.40%

发文量

1601

期刊介绍： ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.