Synthesis of three-dimensional multimetallic PdCuRuMoNi catalysts for efficient methanol oxidation reaction

Pd-based multimetallic electrocatalysts with well-defined architecture demonstrate considerable potential for enhancing the MOR, attributable to their significant synergistic effects. However, achieving controllable synthesis of Pd-based multimetallic alloys to effectively exploit their structural and elemental compositions advantages for enhanced electrocatalytic performance remains a significant challenge. In this work, we develop a universal approach for synthesizing three-dimensional (3D) PdCuRuMoNi multimetallic nanosheets (NSs). The as-prepared 3D PdCuRuMoNi architecture possesses abundant rapid mass transport pathways and superior utilization efficiency, which is beneficial for the MOR. Notably, the optimized PdCuRuMoNi catalyst demonstrates exceptional mass activity (1621.7 mA·mg Pd −1 ) and specific activity (6.3 mA·cm −2 ) in alkaline media, achieving 4.7-fold and 4.2-fold enhancements relative to Pd/C, respectively. Meanwhile, the as-prepared PdCuRuMoNi catalyst also exhibits high stability. This work highlights the capability of multicomponent alloy nanosheets to significantly improve the electrocatalytic MOR performance.