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MXenes, with general formula M_n+1X_nT_x, (where n = 1–4; M = early transition metals; X  = C, N, or a combination of both; T_x = surface functional groups like –OH, -O, -F, or -Cl) are a diverse group of two-dimensional (2D) layered transition metal carbides, nitrides and carbonitrides. Due to the energy and environmental problems, the renewable energy resources have critical importance. Owing to their exceptional properties, including very high electrical conductivity and thermal stability, MXenes are finding increasing applications in energy conversion and storage devices to solve the energy problems of modern society. In this review, we aim to provide a timely snapshot of recent advances in the synthesis, design, and engineering of MXene-based materials for the energy sector. Strategies for optimizing the performance of MXenes materials in energy applications, such as surface nano-engineering and compositing …