ABSTRACT
Two-dimensional (2D) nanomaterials possess unique chemical, structural, optical, morphological, electronic, thermal, and mechanical properties and therefore attract extensive attention in energy-related applications such as supercapacitor, batteries, water splitting, thermal energy storage, and thermoelectric devices. Among the 2D materials, MXenes, graphene, black phosphorus, and transition metal dichalcogenides (TMDs) receive widespread research interest and are sought for energy-related applications. In this chapter, brief accounts are given to research literature for elucidating the preparation methods of MXenes, including chemical vapor deposition, hydrofluoric acid etching process, molten salt methods, and electrochemical etching methods. Further accounts are given to the works on enhancing the performance of electrochemical supercapacitor energy storage by fabricating conjugated microporous polymer/MXene composites, to the works on fabricating 2D TMDs MoS2 and their composites as supercapacitor electrode materials in energy storage applications, and to the works on enhancing thermoelectric power factor or reducing the thermal conductivity of graphene, black phosphorous, 2D TMDs as thermoelectric materials for energy conversion by taking advantage of their unique low-dimension electronic and thermal transport.
