▎ 摘　　要

NOVELTY - The preparation method of graphene nanoribbon involves adding multi-walled carbon nanotubes into a Teflon (RTM: PTFE) reactor, adding dilute acid solution, oscillating, uniformly dispersing multi-walled carbon nanotubes, heating the reactor at 200 degrees C, maintaining the saturated steam pressure in the reactor to 1500 kPa, heating for 15 hours, using assisted etching effect of high-pressure steam generated in the reactor, and cracking multi-walled carbon nanotubes along the longitudinal direction. USE - Preparation of graphene nanoribbon used in preparation of ethanol fuel cell anode material (claimed). ADVANTAGE - The environmentally-friendly method enables the preparation of graphene nanoribbon easily by simple process with high yield, without using surfactants for dispersion. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for graphene nanoribbon for use in ethanol fuel cell, which is used as a carrier to support palladium nanocatalyst.