A novel MnO2/MXene composite prepared by electrostatic self-assembly and its use as an electrode for enhanced supercapacitive performance†,Inorganic Chemistry Frontiers

当前位置： X-MOL 学术 › Inorg. Chem. Front. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

A novel MnO2/MXene composite prepared by electrostatic self-assembly and its use as an electrode for enhanced supercapacitive performance†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-11-19 00:00:00 , DOI: 10.1039/c8qi00957k
Shu Chen _{1,

2,

3,

4} , Yuanfang Xiang _{1,

2,

3,

4} , Weijian Xu _{1,

2,

3,

4} , Chang Peng _{1,

2,

3,

4,

5}

Affiliation

MXene is a new 2D transition metal carbide possessing metallic conductivity and hydrophilic surfaces. It has drawn widespread attention as a potential material for electrode use. However, the applications of MXene are limited by its property of low electrical capacity. In this paper, a novel MnO₂/MXene composite is prepared by electrostatic self-assembly. Firstly, delaminated MnO₂ nanosheets are obtained through the intercalation delamination of multilayered H-MnO₂ in a cationic Gemini surfactant (Gem) solution, leading to a positively charged surface. Then, the positive MnO₂ nanosheets are assembled on negative MXene nanosheets through electrostatic self-assembly to form a MnO₂/MXene composite. The characterization results show that the MnO₂ nanosheets are intimately assembled on the MXene nanosheets. As an electrode material, the MnO₂/MXene composite displays a specific capacitance of 340 F g⁻¹ at 1 A g⁻¹, which is three times the performance of an MXene electrode. In addition, the MnO₂/MXene electrode shows a high retention rate (90.3% retention at 10 A g⁻¹) and good cycling life (87.6% of the initial specific capacitance is retained after 2000 cycles at 4 A g⁻¹). The properties of the proposed composite are attributed to the excellent conductivity of MXene and the high specific capacitance of MnO₂.

中文翻译：

通过静电自组装制备的新型MnO ₂ / MXene复合材料及其用作增强超电容性能的电极†

MXene是一种新型的2D过渡金属碳化物，具有金属导电性和亲水性表面。作为电极用途的潜在材料，它引起了广泛的关注。但是，MXene的应用受到其低电容性能的限制。本文通过静电自组装法制备了一种新型的MnO ₂ / MXene复合材料。首先，通过在阳离子双子表面活性剂（Gem）溶液中对多层H-MnO ₂进行插层来获得层状MnO ₂纳米片，从而产生带正电的表面。然后，通过静电自组装将正MnO ₂纳米片组装在负MXene纳米片上以形成MnO _2。/ MXene复合。表征结果表明，MnO ₂纳米片紧密地组装在MXene纳米片上。作为电极材料，MnO ₂ / MXene复合材料在1 A g ^-1下显示出340 F g ^-1的比电容，这是MXene电极性能的三倍。此外，MnO ₂ / MXene电极显示出高的保留率（在10 A g ^-1时90.3％的保留率）和良好的循环寿命（在4 A g ^-1时2000次循环后保留了87.6％的初始比电容）。提出的复合材料的性能归因于MXene优异的电导率和MnO ₂的高比电容。

更新日期：2018-11-19

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11