• First exclusive review on MOXEN hybrids for asymmetric supercapacitors • Evaluates synthesis methods, electrode architecture, and electrochemical performance • Highlights interfacial engineering and charge transport in hybrid systems • Identifies key challenges like scalability, phase stability, and electrolyte compatibility • Provides future research directions for commercial realization of MOXEN-ASCs Pseudocapacitive MOXENs-hybrid nanostructures integrating MXenes with transition metal oxides-represent a next-generation class of electrode materials for asymmetric supercapacitors (ASCs). By combining the metallic conductivity and surface tunability of MXenes with the rich redox activity of metal oxides, these hybrids deliver remarkable improvements in energy density, power capability, and cycling stability. Despite these advantages, practical translation is constrained by challenges such as phase instability, interfacial incompatibility with electrolytes, and the lack of scalable, environmentally benign synthesis routes. This review systematically consolidates the progress in MOXEN-based ASCs, highlighting advances in synthetic methodologies, electrode design, device architectures, and electrochemical performance metrics. Particular attention is given to emerging strategies-including hetero interface engineering, defect modulation, and layered assembly—that enhance charge storage kinetics and long-term durability. The novelty of this work lies in providing the first unified perspective on the synergistic interactions between MXenes and transition metal oxides in asymmetric configurations, an area thus far underexplored. By critically assessing current progress and pinpointing key limitations, this review establishes a roadmap for the rational design, scalable fabrication, and eventual commercialization of high-performance MOXEN-based energy storage technologies.
Francis et al. (Sun,) studied this question.