▎ 摘　　要

NOVELTY - Preparing membrane electrode assembly comprises providing an ion exchange membrane, where at least one surface of the ion exchange membrane has an array structure, and the array structure comprises multiple micro-nano protrusions distributed in an array, and sequentially supporting a catalyst and an electronic conductor on at least the array structure. USE - The method is useful for preparing membrane electrode assembly, which is useful for preparing electrochemical devices, fuel cell, and electrolytic cell (all claimed), as chemical energy and electric energy conversion device for cleaning energy preparation used for relieving energy crisis and reducing greenhouse gas emission. ADVANTAGE - The method: prepares membrane electrode assembly by magnetron sputtering supported catalyst and spraying electronic conductor to construct three-phase interface; greatly increases the three-phase interface (electron, proton, mass transfer) inside the catalyst layer; form a channel for the rapid transfer of reactants, protons, and electrons, which is beneficial to reduce the catalyst loading; improves catalyst utilization; and improves performance and stability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a membrane electrode assembly prepared by above mentioned method; (2) a fuel cell; and (3) an electrolytic cell.