Synthesis and Characterization of Low-Dimensional Quaternary Sulfides of Thallium, TlCuGeS, TlAgGeS, and TlAgSnS.

Three new low-dimensional quaternary sulfides, namely, TlCuGeS(), TlAgGeS(), and TlAgSnS() were synthesized by solid-state reactions and characterized by single-crystal X-ray diffraction, spectroscopic, thermal, and photocatalytic studies. The compounds , , and , respectively, have centrosymmetric layered, noncentrosymmetric layered, and noncentrosymmetric one-dimensional structures, in which Cu, Ge, and Sn ions have tetrahedral coordination and Ag ion has linear, trigonal planar and tetrahedral coordinations. The monovalent thallium cations have TlS dodecahedral coordination and TlS and TlS coordination polyhedra of irregular shape.

Promising anode materials for alkali metal ion batteries: a case study on cobalt anti-MXenes.

There is continuous demand for energy storage devices with high energy densities in consumer electronics, electric vehicles, and the grid energy market. Although commercial lithium-ion batteries (LIBs) satisfy the current needs, the limited availability of their raw materials and the moderate specific charge capacities (SCCs) of LIBS have motivated scientists to search for alternate anode materials for LIBs and create technologies beyond LIBs. In this work, we studied the potential of six cobalt anti-MXenes (CoAs, CoB, CoP, CoS, CoSe, and CoSi), a class of newly discovered 2D materials, as anode materials for lithium, sodium, and potassium ion batteries (LIBs, NIBs, and KIBs).