▎ 摘　　要

NOVELTY - Preparing an ultra-thin sheet material comprises stirring the cellulose modified with alkyl functional groups and dissolving in deionized water at room temperature, forming a colorless and transparent viscous cellulose gelatinous solution with a concentration of 5-100 mg/ml, configuring metal ruthenium salt into a solution with a concentration of 0.01-2 mmol/l, while stirring at a speed of 100-800 rotations/minute, dropping the metal ruthenium salt solution into the colorless and transparent viscous cellulose gelatinous solution, performing subsequent replacement washing with deionized water to remove the remaining cellulose molecules to obtain purified ultrathin sheet material. USE - The method is useful for preparing an ultra-thin sheet material, which is useful in the preparation of the hydrogen evolution reaction (claimed). ADVANTAGE - The ultra-thin sheet material: exhibits excellent catalytic activity under the acid medium and the hydrogen evolution reaction. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for ultra-thin sheet material.