▎ 摘　　要

NOVELTY - Method for preparing plant fiber-based flexible carbon-based membrane electrode material involves (i) mechanically pulverizing plant fiber raw material, and removing non-cellulose impurities by paper pulping method to obtain pretreated plant fiber pulp, (ii) using an alkaline aqueous solution of sodium thiosulfate to hydrothermally treat pretreated plant fiber pulp or hydrothermally treating the pretreated plant fiber pulp with an alkaline aqueous solution of sodium thiosulfate to make the hydrothermally treated plant fiber pulp into plant fiber paper, (iii) soaking the plant fiber pulp after hydrothermal treatment in a transition metal salt aqueous solution to make into plant fiber paper and drying (or) soaking the plant fiber paper with transition metal salt aqueous solution and drying, (iv) sintering the dried plant fiber paper at a high temperature to become a carbon-based film and cooling the sintered product, and (v) obtaining the product. USE - The method is useful for preparing plant fiber-based flexible carbon-based membrane electrode material. ADVANTAGE - The method is simple and easy to implement. The flexible electrode material has excellent electrochemical performance.