Intercalation and surface modification of two-dimensional transition metal carbonitride Ti3CNTx for ultrafast supercapacitors

Xu, Shuaikai1; Li, Zhemin1; Wei, Guodong4; Wang, Yuanhao3; Yang, Ya1,2

2022-08-01

10.1039/d2ta04962g

Journal of Materials Chemistry A   影响因子和分区

2050-7488

2050-7496

MXenes are promising supercapacitor electrodes due to their two-dimensional structure and electrochemically active surface. As a member of MXenes, Ti3CNTx is a transition metal carbonitride with a similar structure to Ti3C2Tx, and it is considered to have excellent electrochemical performance. However, the electrochemical performance of Ti3CNTx is usually limited by nanosheet agglomeration and surface terminations the same as that of Ti3C2Tx. In this work, we demonstrated that intercalating K+ and removing surface terminations (-OH, -F) significantly improved the gravimetric capacitance of Ti3CNTx up to 464 F g(-1). Furthermore, the introduction of Ag nanowires between Ti3CNTx layers can further enhance the charge transport through Ti3CNTx films, and it revealed a very high gravimetric capacitance of 245 F g(-1) even at 2000 mV s(-1). The as-assembled all-solid-state symmetric supercapacitors showed an energy density of 6.9 mW h g(-1), indicating their promising potential for flexible electronic devices. These results proved that intercalation and surface modification can significantly enhance the electrochemical performance of Ti3CNTx films, promoting the development of Ti3CNTx-based electrodes, which have broad application prospects in flexible supercapacitors, wearable electric devices, and other fields.

SCI

英语

通讯

National Natural Science Foundation of China (NSFC)["52072041","51571065"] ; Natural Science Foundation of Guangxi Province[2020JJB120060] ; Special Talents Foundation of Guangxi Province[2021AC19174] ; Beijing Natural Science Foundation[JQ21007]

Chemistry ; Energy & Fuels ; Materials Science

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary

WOS:000847500200001

ROYAL SOC CHEMISTRY

Web of Science

1.Guangxi Univ, Guangxi Coll & Univ Key Lab Novel Energy Mat & Re, Coll Phys Sci & Technol, Guangxi Novel Battery Mat Res Ctr Engn Technol,Ct, Nanning 530004, Peoples R China
2.Chinese Acad Sci, CAS Ctr Excellence Nanosci, Beijing Inst Nanoenergy & Nanosyst, Beijing Key Lab Micronano Energy & Sensor, Beijing 101400, Peoples R China
3.Southern Univ Sci & Technol, SUSTech Engn Innovat Ctr, Sch Environm Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
4.Shaanxi Univ Sci & Technol, Sch Phys & Energy, Mat Inst Atom & Mol Sci, Xian 710021, Shaanxi, Peoples R China

Xu, Shuaikai,Li, Zhemin,Wei, Guodong,et al. Intercalation and surface modification of two-dimensional transition metal carbonitride Ti3CNTx for ultrafast supercapacitors[J]. Journal of Materials Chemistry A,2022.

Xu, Shuaikai,Li, Zhemin,Wei, Guodong,Wang, Yuanhao,&Yang, Ya.(2022).Intercalation and surface modification of two-dimensional transition metal carbonitride Ti3CNTx for ultrafast supercapacitors.Journal of Materials Chemistry A.

Xu, Shuaikai,et al."Intercalation and surface modification of two-dimensional transition metal carbonitride Ti3CNTx for ultrafast supercapacitors".Journal of Materials Chemistry A (2022).