Safe Etching Route of NbSnC for the Synthesis of Two-Dimensional NbCT MXene: An Electrode Material with Improved Electrochemical Performance.

In this study, low-temperature synthesis of a NbSnC non-MAX phase was carried out via solid-state reaction, and a novel approach was introduced to synthesize 2D NbCT MXenes through selective etching of Sn from NbSnC using mild phosphoric acid. Our work provides valuable insights into the field of 2D MXenes and their potential for energy storage applications. Various techniques, including XRD, SEM, TEM, EDS, and XPS, were used to characterize the samples and determine their crystal structures and chemical compositions.