Stereo Assembly of Bimetallic PtPd on Ti3C2Tx/PProDOT for Efficient Methanol Oxidation Reaction in Both Acidic and Alkaline Media

Abstract The rational construction of efficient and stable electrocatalysts for methanol oxidation reaction (MOR) in acidic and alkaline media affects the commercialization of direct methanol fuel cells (DMFCs). Here, poly(3,4‐propylenedioxythiophene) (PProDOT)‐embedded Ti 3 C 2 T x flakes for the growth of platinum and palladium bimetallic nanoparticles (PtPd) by a chemically reduced hydrothermal process are assembled. The constructed Ti 3 C 2 T x /PProDOT/PtPd hybrids exhibit 3D‐layered stereoscopic structures. After the embedding of PProDOT, the re‐stacking of MXene flakes is suppressed and the interlayer spacing between flakes is extended, allowing the Ti 3 C 2 T x /PProDOT interface to promote nanoparticle deposition, active site exposure, and charge transport. The electrochemical test outcomes reveal that the catalytic activity of Ti 3 C 2 T x /PProDOT/PtPd for MOR far exceeds that of Ti 3 C 2 T x /PtPd and Pt/C. In acidic electrolytes, the mass activity (MA) of Ti 3 C 2 T x /PProDOT/PtPd is 2206.1 mA mg −1 , which is 4.4 and 5.8 times higher than that of Ti 3 C 2 T x /PtPd and Pt/C, respectively. In alkaline electrolytes, the MA of Ti 3 C 2 T x /PProDOT/PtPd reaches 4180 mA mg −1 , which is 2.1 and 4.8 times higher than that of Ti 3 C 2 T x /PtPd and Pt/C, respectively. Meanwhile, its stability and CO tolerance improve significantly. Besides, Ti 3 C 2 T x /PProDOT/PtPd also exhibits enhanced catalytic activity toward ethanol oxidation.