Grain Boundary-Enriched Wavy Pd Nanowires Intertwined with MXene Nanosheets toward Formic Acid and Methanol Electrooxidation

The rational design and precise fabrication of nanostructured noble metals with sophisticated morphology and meliorative electronic structures are the key in the development of advanced electrode materials for fuel cell technology. Herein, we present a robust and controllable stereoassembly method to the construction of 1D grain boundary-enriched wavy Pd nanowires intertwined with 2D ultrathin Ti₃C₂T_<i>x</i> MXene nanosheets (Pd NWs/MX). By taking a series of unique architectural merits including interconnected wavy Pd nanowires, rich grain boundaries, stable 1<i>D</i>/2D heterointerface, direct electronic interaction as well as high electrical conductivity, the resultant Pd NWs/MX heterojunction expresses excellent electrocatalytic activities, strong antitoxic ability, and long lifespan toward both formic acid and methanol oxidation reactions, all of which are significantly superior to those of widely used Pd particle catalysts supported by conventional carbon matrixes.