▎ 摘　　要

NOVELTY - The method involves coating a self-assembled film on a substrate using Langmuir-Blodgett technique. The film is derived from graphene. The coated substrate is immersed into microalgae culture, and then incubated to grow microalgae to obtain a biofilm. The graphene is one of graphene oxide or reduced graphene oxide. The substrate is one of glass, paper, carbon paper, plastic, metal, alloy, ceramic and or polymer. The microalgae is Chlorella, Spirulina, Synechococcus Coscinodiscus, Scenedesmus, Oocystis, or Chlorococcum. USE - Method of preparing electrode, particularly an anode, for use in biophotovoltaic device, particularly in a biological electrochemical system for harvesting solar energy and generating electrical power. ADVANTAGE - The use of the reduced graphene oxide biofilm anode significantly increases the potential across the terminals in the biophotovoltaic device compared to the potential of the device using indium tin oxide film anode, especially since the graphene oxide has enhanced electrical conductivity. DESCRIPTION OF DRAWING(S) - The drawing shows the field emission scanning electron micrograph (FESEM) of a film derived from reduced graphene oxide.