MXenes and transition metal selenides (TMSe) have emerged as prominent electrode materials for energy storage and conversion applications. The integration of diverse TMSe nanostructures with MXenes introduces promising research avenues for tailored designs ranging from zero-dimensional (0D) to three-dimensional (3D) configurations, boosting structural integrity and enhancing the transport properties of ions and electrons. This integrative framework significantly enhances the overall electrochemical performance. This review examines recent advancements in the integrated design of TMSe and MXenes, specifically focusing on their application in various energy storage (such as supercapacitors, lithium-ion, sodium-ion, magnesium-ion, aluminum-ion, and lithium–sulfur batteries) and energy conversion (including hydrogen and oxygen evolution reactions) systems. Furthermore, it discusses the existing challenges and future prospects of employing MXene/TMSe hybrids not only for sustainable electrochemical energy storage and conversion but also for diverse electronic devices.

MXenes are fast-growing two-dimensional (2D) carbides, nitrides, and carbonitrides nanomaterials exhibiting combined special features of high electronic conductivity, optoelectronic properties, and electrochemical properties with hydrophilicity character. The plasmonic characteristics of MXenes with optical nonlinearities associated with ultrafast dynamics empower it as one of the strongest candidates for transparent optoelectronic applications in the field of energy storage, conversion, photodetectors, quantum dot light-emitting diodes, smart windows, environmentally. It is timely to introduce and summarize a review article dedicated to the transparent MXene-based multifunctional applications that provide well-designed future roadmaps for these significant MXene smart materials. This review comprehensively discusses the transparent MXenes towards transparent electrodes for supercapacitors and beyond. The importance of MXene optoelectronic properties and tunability via composite materials incorporated with different polymers, oxides, sulfides, and carbonaceous nanomaterials are also thoroughly reviewed.