Keke Liu , Qixun Xia , Lijun Si , Ying Kong , Nanasaheb Shinde , Libo Wang , Junkai Wang , Qianku Hu , Aiguo Zhou
{"title":"Defect engineered Ti3C2Tx MXene electrodes by phosphorus doping with enhanced kinetics for supercapacitors","authors":"Keke Liu , Qixun Xia , Lijun Si , Ying Kong , Nanasaheb Shinde , Libo Wang , Junkai Wang , Qianku Hu , Aiguo Zhou","doi":"10.1016/j.electacta.2022.141372","DOIUrl":null,"url":null,"abstract":"<div><p>Supercapacitors (SCs) have attracted increasing attention due to high power density, rapid charge/discharge, excellent cyclic stability, and withstands adverse environments. Two-dimensional (2D) Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene is considered as a promising electrode material for electrochemical energy storage. However, undesirable low specific capacitance issues limit its practical applications. Herein, a facile heteroatom doping strategy is proposed to construct defect-rich Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene with abundant active cites. Hence, P-doped Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene was synthesized by a simple annealing method. The prepared P-doped Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> was used as the electrode material of SC, and it was found that the P-doped Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> exhibits enhanced electrochemical performance compare to the pristine Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene, the P-doped Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> electrode could deliver a high specific capacity of 31.11 mA h g<sup>−1</sup> at 1 A g<sup>−1</sup> in 1 M KOH electrolyte. Furthermore, a P-doped Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> based symmetric SC device is fabricated and displays excellent energy density of 8.2 Wh L<sup>−1</sup> at a power density of 303.4 W L<sup>−1</sup>. This study provides a straightforward strategy to design and construct MXene-based electrode materials with enlarged layer spacing structure for high-performance K<sup>+</sup> storage and even in other metal ion storages.</p></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":null,"pages":null},"PeriodicalIF":5.5000,"publicationDate":"2022-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electrochimica Acta","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0013468622015298","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ELECTROCHEMISTRY","Score":null,"Total":0}
引用次数: 7
Abstract
Supercapacitors (SCs) have attracted increasing attention due to high power density, rapid charge/discharge, excellent cyclic stability, and withstands adverse environments. Two-dimensional (2D) Ti3C2Tx MXene is considered as a promising electrode material for electrochemical energy storage. However, undesirable low specific capacitance issues limit its practical applications. Herein, a facile heteroatom doping strategy is proposed to construct defect-rich Ti3C2Tx MXene with abundant active cites. Hence, P-doped Ti3C2Tx MXene was synthesized by a simple annealing method. The prepared P-doped Ti3C2Tx was used as the electrode material of SC, and it was found that the P-doped Ti3C2Tx exhibits enhanced electrochemical performance compare to the pristine Ti3C2Tx MXene, the P-doped Ti3C2Tx electrode could deliver a high specific capacity of 31.11 mA h g−1 at 1 A g−1 in 1 M KOH electrolyte. Furthermore, a P-doped Ti3C2Tx based symmetric SC device is fabricated and displays excellent energy density of 8.2 Wh L−1 at a power density of 303.4 W L−1. This study provides a straightforward strategy to design and construct MXene-based electrode materials with enlarged layer spacing structure for high-performance K+ storage and even in other metal ion storages.
超级电容器因其高功率密度、快速充放电、优异的循环稳定性和耐恶劣环境等优点而受到越来越多的关注。二维(2D) Ti3C2Tx MXene被认为是一种很有前途的电化学储能电极材料。然而,低比电容问题限制了其实际应用。本文提出了一种简单的杂原子掺杂策略来构建具有丰富活性城邦的富缺陷Ti3C2Tx MXene。因此,采用简单的退火方法合成了p掺杂Ti3C2Tx MXene。将制备的p掺杂Ti3C2Tx作为SC的电极材料,发现与原始Ti3C2Tx MXene相比,p掺杂Ti3C2Tx的电化学性能有所提高,在1 M KOH电解质中,p掺杂Ti3C2Tx电极在1 a g−1下可以提供31.11 mA h g−1的高比容量。在303.4 W L−1的功率密度下,制备了p掺杂Ti3C2Tx的对称SC器件,其能量密度为8.2 Wh L−1。该研究为设计和构建具有扩大层间距结构的mxene基电极材料提供了一种简单的策略,用于高性能K+存储甚至其他金属离子存储。
期刊介绍:
Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.