journal article·2023-03-29

Facile Tailoring of Surface Terminations of MXenes by Doping Nb Element: Toward Extraordinary Pseudocapacitance Performance

Jianguang Xu, Zhiyong Liu, Qiang Wang, Junsheng Li, Yuxiang Huang, Mengnan Wang, Linyu Cao, Wei Yao, Haijiang Wu, Chi Chen

ACS Applied Materials & Interfaces· Volume 15· Issue 12
Publisher page

Abstract

MXenes show promising potential in supercapacitors due to their unique two-dimensional (2D) structure and abundant surface functional groups. However, most studies about MXenes have focused on tailoring surface structures by alternating synthesis methods or post-etch treatments, and little is known about the inherent relationship between surface groups and M elements. Herein, we propose a simple and novel strategy to adjust the surface structure of few-layered MXene flakes by adding a small amount of Nb element. Because of the strong affinity between Nb and O elements, the as-received V 1.8 Nb 0.2 CT x and Ti 2.7 Nb 0.3 C 2 T x MXenes have much fewer −F functional groups and a higher O content than V 2 CT x and Ti 3 C 2 T x MXenes, respectively. Thus, both V 1.8 Nb 0.2 CT x and Ti 2.7 Nb 0.3 C 2 T x MXenes show enhanced pseudocapacitance performance. Especially, V 1.8 Nb 0.2 CT x delivers an ultrahigh volumetric capacitance of 1698 F/cm 3 at a scan rate of 2 mV/s. Moreover, benefiting from the high activity of MAX precursors obtained through a fast self-propagating high-temperature synthesis, the etching time to produce V-based MXenes is much shorter than that in previous reports. Therefore, the results presented here are applicable to the surface engineering and rational design of 2D MXene materials and develop them into promising, cost-effective electrode materials for supercapacitors or other energy-storage equipment.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: MXene and MAX Phase Materials · Supercapacitor Materials and Fabrication · Advanced Memory and Neural Computing

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials and Energy, Shanghai Key Laboratory of Engineering Materials Application and Evaluation, Shanghai Polytechnic University, Shanghai 201209, P. R. China

School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu, P. R. China

School of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, P. R. China

Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing, Shaoyang University, Shaoyang 422000, Hunan, P. R. China

CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China

Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, and Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen 361021, P. R. China

Funding

Natural Science Foundation of?Hunan Province · Qinglan Project of Jiangsu Province of China · Science and Technology Commission of Shanghai Municipality · National Natural Science Foundation of China · Shanghai Local Capacity Building Program

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