Biomass-derived two-dimensional carbon materials: Synthetic strategies and electrochemical energy storage applications

•Synthetic strategies of biomass-derived 2D carbon materials are summarized.•The structure and electrochemical properties of biomass-derived 2D carbon nanomaterials are presented.•Biomass-derived 2D carbon nanomaterials as sustainable electrodes for electrochemical energy storage devices are discussed.•Research challenges and future opportunities in this exciting filed are proposed.