The reactive metal–support interaction (RMSI) offers electronic, geometric and compositional effects that can be used to tune catalytic active sites. Generally, supports other than oxides are disregarded as candidates for RMSI. Here, we report an example of non-oxide-based RMSI between platinum and Nb₂CT _x MXene—a recently developed, two-dimensional metal carbide. The surface functional groups of the two-dimensional carbide can be reduced, and a Pt–Nb surface alloy is formed at a moderate temperature (350 °C). Such an alloy exhibits weaker CO adsorption than monometallic platinum. Water-gas shift reaction kinetics reveals that the RMSI stabilizes the nanoparticles and creates alloy–MXene interfaces with higher H₂O activation ability compared with a non-reducible support or a bulk niobium carbide. This RMSI between platinum and the niobium MXene support can be extended to other members of the MXene family and opens new avenues for the facile design and manipulation of functional bimetallic catalysts.

活性金属与载体的相互作用（RMSI）提供了电子，几何和成分效应，可用于调整催化活性位。通常，不考虑氧化物以外的载体作为RMSI的候选物。在这里，我们报告了一个铂和Nb ₂ CT _x MXene（一种最近开发的二维金属碳化物）之间基于非氧化物的RMSI的示例。可以减少二维碳化物的表面官能团，并在中等温度（350°C）下形成Pt-Nb表面合金。这样的合金比单金属铂表现出更弱的CO吸附。水煤气变换反应动力学表明，RMSI稳定了纳米颗粒，并形成了具有较高H _2的合金-MXene界面 与不可还原的载体或块状碳化铌相比具有O活化能力。铂和铌MXene载体之间的RMSI可以扩展到MXene系列的其他成员，并为功能性双金属催化剂的简便设计和操作开辟了新途径。