▎ 摘　　要

NOVELTY - Ruthenium/ruthenium oxide modified nitrogen-doped graphene three-dimensional composite material is claimed. The composite material is obtained by hydrothermally reacting ruthenium chloride trihydrate, graphene oxide and polypyrrole in deionized water to obtain aerogel, and oxidizing aerogel and calcium carbonate to obtain final product. USE - The composite material is useful as catalyst in electrocatalytic decomposition of water (claimed). ADVANTAGE - The composite material has low over-potential; reduces energy consumption and simplifies design of entire electrolysis water system; exhibits excellent hydrogen evolution reaction and oxygen evolution reaction performance and excellent stability in different electrolytes. The method has simple operation, low cost, controllable reaction process and high product yield. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing ruthenium/ruthenium oxide modified nitrogen-doped graphene three-dimensional composite material.