多孔Ti_(3)C_(2)T_(x)/SnSe复合材料的制备及其储钾性能

The Synthesis of Porous Ti_(3)C_(2)T_(x)/SnSe Composite and Its Potassium Storage Performance

采用原位氧化-刻蚀法和水热合成法制备了多孔MXene复合材料(Ti_(3)C_(2)T_(x)/SnSe),并对所制备的材料进行了结构表征与电化学性能测试.结果表明:在0.05 A/g的电流密度下,多孔Ti_(3)C_(2)T_(x)/SnSe电极具有381.9 mA·h/g的储钾容量,而相同情况下SnSe电极的比容量仅为119.2 mA·h/g.在1 A/g的电流密度下,多孔Ti_(3)C_(2)T_(x)/SnSe电极的初始可逆比容量为118.5 mA·h/g,循环500次的比容量仍保持在35.4 mA·h/g.多孔Ti_(3)C_(2)T_(x)/SnSe电极材料优异的电化学性能得益于多孔Ti_(3)C_(2)T_(x)材料的高导电性,它不仅缓解了SnSe的体积膨胀,而且为离子的转移提供了良好的通路.

The porous MXene composite material(Ti_(3)C_(2)T_(x)/SnSe)was fabricated with the in-situ oxidation-etching method and the hydrothermal synthesis technology.The composition,structure and electrochemical properties of the prepared materials were evaluated.The research results showed that the porous Ti_(3)C_(2)T_(x)/SnSe electrode deliveed a capacity of 381.5 mA·h/g at a current density of 0.05 A/g while the specific capacity of the pure SnSe electrode was only 119.2 mA·h/g.At a current density of 1 A/g,the Ti_(3)C_(2)T_(x)/SnSe electrode showed an initial reversible specific capacity of 118.5 mA·h/g and it remained at 35.4 mA·h/g after 500 cycles.The excellent electrochemical performance of the porous Ti_(3)C_(2)T_(x)/SnSe electrode material mainly benefits from the high conductivity of Ti_(3)C_(2)T_(x),which not only alleviates the volume expansion of SnSe but also provides a good path for the ionic transfer.