Constructing Porous Cu Nanoparticles on PdCu Bimetallene as Electron Regulator and Electrocatalyst for Ethanol Oxidation Reaction

Direct ethanol fuel cells have attracted significant attention due to their high energy density, environmental friendliness, fuel availability, and low toxicity. However, their broader application is constrained by the anode catalyst limitations such as low active site density and low stability caused by the CO* intermediate poisoning. In this work, Pd metallene was synthesized via a hydrothermal method, and transition metal Cu was introduced to obtain PdCu bimetallene supported with porous Cu nanoparticles (NPs). The results indicate that the unique configuration of Cu not only enhances the CO* intermediate tolerance of Pd through electronic interactions but also leverages the intrinsic catalytic activity of Cu, leading to a further improvement in catalytic performance. Therefore, the designed PdCu bimetallene/Cu NPs exhibits a high mass activity of 1.26 A mg _Pd ⁻¹ for the ethanol electro oxidation reaction, which is 8.4 times that of commercial Pd/C and superior to recently reported Pd‐based catalysts. In addition, it maintains a current density of 7.87 mA cm ⁻² after a 3000 s stability test, demonstrating considerable potential for practical applications. This work provides feasible ideas for the microstructure design and electronic control optimization of metallene in small molecule catalysis.