| Abstract Scope |
MXenes offer an unusually broad composition space, but most studies still focus on a small set of carbide compositions. This talk will discuss how solid-solution design at both the M and X sites expands MXenes as tunable two-dimensional materials. Mixed-metal MXenes allow transition-metal distributions to modify bonding, lattice structure, transport, optical response, and electrochemical behavior, while also providing access to compositions that may be unstable as single-metal analogues. Carbonitride MXenes provide a complementary X-site design axis, where nitrogen incorporation changes the local metal–X bonding environment and influences surface terminations, conductivity, optical absorption, and surface electronic structure. Together, M- and X-site engineering create allow engineering of chemical disorder, bonding, and surface chemistry, and hence functional properties, enabling rational design of MXenes for optoelectronic, electrochemical, and energy-related applications. |