▎ 摘　　要

NOVELTY - A graphene-based composite material comprises graphene having surface which is at least partially covered by a metal film containing magnesium. USE - Graphene-based composite material is used in article in the form stiff capsule, soft capsule, pod or sachet for generating hydrogen and heat in aqueous environment, preferably at room temperature (all claimed). ADVANTAGE - The composite material effectively generates high quantity of hydrogen and heat when placed in the aqueous environment by hydrolysis reaction without using toxic and hazardous activating chemicals such as acids or bases, and/or catalysts. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for production of the graphene-based composite material.