# Interfacial Engineering of Ti3C2Tx MXene Electrode Using g-C3N4 Nanosheets for High-Performance Supercapacitor in Neutral Electrolyte

## TL;DR

This paper presents a method to improve the performance of MXene-based supercapacitors in neutral electrolytes by incorporating g-C3N4 nanosheets.

## Contribution

The novel approach uses protonated g-C3N4 to enhance ion accessibility and conductivity in MXene electrodes.

## Key findings

- The composite electrode achieved a gravimetric capacitance of 140 F g–1 in 1 M aqueous MgSO4.
- The electrode showed excellent cyclic stability with negligible capacitance loss over 10,000 cycles.

## Abstract

The superior performance of the Ti3C2Tx (MXene)-based supercapacitor in acidic
electrolytes
has recently gained much interest in the energy storage community.
Nevertheless, its performance in most neutral electrolytes is unfavorably
low, plausibly due to limited ion diffusion between the MXene layers.
Herein, protonated g-C3N4 (pg-C3N4) is incorporated into the Ti3C2Tx electrode by using a facile self-assembling
process and annealing, which results in increased interlayer d-spacing and electrical conductivity of the composite electrode.
As a result, the annealed Ti3C2Tx/pg-C3N4 film revealed an enhanced
ion-accessibility and gravimetric capacitance of 140 F g–1 in 1 M aqueous MgSO4 electrolyte. The cyclic stability
test also indicates excellent capacitance retention, with negligible
loss of capacitance over 10000 cycles.