▎ 摘　　要

NOVELTY - Preparation of electrocatalyst involves forming a silicate sol-gel matrix layer functionalized with an amine on an electrode, forming a reduced oxidized graphene nanosheet functionalized with beta -cyclodextrin on the matrix layer, performing electrodeposition of gold, and growing gold dendrite nanostructures induced and controlled by cyclodextrin on graphene nanosheet. USE - Preparation of electrocatalyst used in biosensor for detecting sodium nitrite, sensor for detecting D-(+)-glucose, and fuel cell (all claimed). ADVANTAGE - The electrocatalyst having excellent catalytic activity is produced economically by simple method, and provides sensor capable of accurately detecting predetermined analyte.