▎ 摘　　要

NOVELTY - Preparation of three-dimensional porous graphene involves mixing graphene oxide solution with hydrogen peroxide solution, and ultrasonically processing to obtain mixed solution, and placing the mixed solution in a reaction vessel for performing hydrothermal reaction, washing, and drying. USE - Preparation of three-dimensional porous graphene used as electrochemical electrode material in electrochemical sensor for detection of ascorbic acid, uric acid or nitrite content (all claimed). ADVANTAGE - The three-dimensional porous graphene prepared by hydrothermal method has abundant three-dimensional micropores and two-dimensional in-plane nanopores. The three-dimensional porous graphene-based electrochemical electrode material prepared has high sensitivity, short response time, strong anti-interference ability, excellent repeatability, long-term stability, and high recovery rate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of three-dimensional porous graphene-based electrochemical electrode material, which involves formulating three-dimensional porous graphene into dispersion liquid, and dripping to center of glassy carbon electrode substrate, and vacuum-drying at room temperature.