Surface engineered covalent bridging strategy to in-situ fabricate MXene-based core-sheath fiber for flexible supercapacitors with ultrahigh volumetric energy density and mechanical properties

被引：3

作者：

Sun, Yiting ^{[1
,2
]}

Li, Tiehu ^{[1
,2
]}

Liu, Xin ^{[1
,2
]}

Liu, Yuhui ^{[1
,2
]}

Zada, Amir ^{[3
,4
]}

Han, Yanying ^{[1
,2
]}

Ye, Fei ^{[1
,2
]}

Li, Hao ^{[1
,2
]}

Dang, Alei ^{[1
,2
]}

机构：

[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, Xian 710072, Peoples R China

[2] Northwestern Polytech Univ, Sch Mat Sci & Engn, Shannxi Engn Lab Graphene New Carbon Mat & Applica, Xian 710072, Peoples R China

[3] Abdul Wali Khan Univ, Dept Chem, Mardan 23200, Pakistan

[4] Univ South Africa, Coll Grad Studies, UNESCO UNISA Afr Chair Nanosci & Nanotechnol, POB 392, ZA-0002 Pretoria, South Africa

来源：

CHEMICAL ENGINEERING JOURNAL | 2024年 / 498卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

MXene fiber; Flexible electrodes; Surface engineering; Mechanical properties; Supercapacitors; GRAPHENE OXIDE; PERFORMANCE; ELECTRODES;

D O I：

10.1016/j.cej.2024.155578

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

MXene fiber-based supercapacitors (SCs) are expected to make a major contribution to the ongoing development of wearable electronics and metaverse technologies in future. However, to fabricate fiber electrodes with high energy density and strong mechanical properties remains a major challenge for their usage in SCs. Herein, we fabricated a flexible core-sheath structural Ti3C2Tx MXene@polyaniline (MX@PA) fiber electrode with ultrahigh volumetric energy density and good tensile strength through surface engineered covalent bridging strategy via wet spinning and in situ oxidant-free polymerization processes. Benefiting from the high-order core-sheath structure and strong Ti-O-N covalent bonds between MXene and PANI, an ultrahigh tensile strength (similar to 168.1 MPa) and super-toughed (similar to 1.75 MJ cm(-3)) fiber electrode was achieved. The assembled SC provided much higher volumetric capacitance of 631F cm(-3) (based on the SC device) at a current density of 0.5 A cm(-3) and ultralong-term cycling stability with 92.6 % capacitance retention after 10000cycles due to the rapid electron conduction of core (MXene) and large pseudocapacitive charge transfer of the sheath (PANI). As a result, the SC delivers excellent volumetric energy density of 56.1 mWh cm(-3) at a power density of 204.9 mW cm(-3). The integrated SC found actual application to power a 2.5 V red LED.

引用

页数：10