High-performance diatom co-doped Ti3C2Tx electrode material based on guanidine salt

The co-doping of a variety of heteroatoms can enhance the chemical reactivity and electron transport capacity of the composites. However, the doping process of Ti3C2Tx is usually carried out under harsh reaction conditions such as high temperature and protective atmosphere, which is easy to destroy the two-dimensional structure of Ti3C2Tx. Therefore, it is necessary to create doping conditions with reducing environment. In this work, Sulfur-nitrogen and phosphorus-nitrogen diatomic co-doped Ti3C2Tx ((S, N)-Ti3C2Tx and (P, N)-Ti3C2Tx) are first prepared using two weakly reducing guanidine salts, and the corresponding electrodes are prepared. The electrochemical test results show that at 1 A g−1, the Cm of (S, N)-Ti3C2Tx and (P, N)-Ti3C2Tx is 269.3 F/g and 168.3 F/g, which are 2.03 times and 1.27 times that of Ti3C2Tx (132.6 F/g), respectively. In addition, guanidine salt doping also gives Ti3C2Tx improves cycle stability. These results show that (S, N)-Ti3C2Tx and (P, N)-Ti3C2Tx can be used as excellent electrode materials for high-performance supercapacitors. Guanidine salt is a new heteroatomic source, and its processing operation provides a broader and more convenient experimental idea for heteroatomic doping. •(S, N)-Ti3C2Tx and (P, N)-Ti3C2Tx were first prepared using reducing guanidine salts.•Cm of (S, N)-Ti3C2Tx and (P, N)-Ti3C2Tx was 269.3 F/g and 168.3 F/g, respectively.•Cycle stability of Ti3C2Tx was improved by guanidine salt doping.•(S, N)-Ti3C2Tx and (P, N)-Ti3C2Tx can be used as the excellent electrode materials.