Electrochemical Performance of Niobium MXenes with Lanthanum

Author(s)

Gandara, Meriene ; Palley, Bianca Fortes ; Rakcoevic, Lazar ; Mladenovic, Dusan ; Popovic-Bijelic, Ana ; Sljukic, Biljana ; Goncalves, Emerson Sarmento

• Document type: Journal article
• Source: ACS APPLIED MATERIALS & INTERFACES; v. 16, n. 39, p. 13-pg., 2024-09-16.

Abstract

MXenes are the newest class of two-dimensional nanomaterials characterized by large surface area, high conductivity, and hydrophilicity. To further improve their performance for use in energy storage devices, heteroatoms or functional groups can be inserted into the Mxenes' structure increasing their stability. This work proposes insertion of lanthanum atoms into niobium-MXene (Nb-MX/La) that was characterized in terms of morphogy, structure, and electrochemical behavior. The addition of La to the Nb-MXene structure was essential to increase the spacing between the layers, improving the interaction with the electrolyte and enabling charge/discharge cycling in a higher potential window and at higher current densities. Nb-MX/La achieved a specific capacitance of up to 157 mF cm(-2), a specific capacity of 42 mAh cm(-2) at 250 mV s(-1), a specific power of 37.5 mW cm(-2), and a specific energy of 14.1 mWh cm(-2) after 1000 charge/discharge cycles at 50 mA cm(-2). (AU)

• FAPESP's process: 23/14091-0 - Development and characterization of supercapacitor and lithium-ion batteries with new two-dimensional materials: Nb-MXenes
• Grantee: Meriene Gandara
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 22/02737-0 - Development of supercapacitor devices from 2D and 3D nanomaterial electrodes: graphene, MXenes and metal nanooxides
• Grantee: Emerson Sarmento Gonçalves
• Support Opportunities: Regular Research Grants
• FAPESP's process: 22/02347-7 - New technologies for supercapacitors and lithium-ion batteries from rare earth-doped MXenes
• Grantee: Meriene Gandara
• Support Opportunities: Scholarships in Brazil - Doctorate