Hierarchical Porosity Carbon Derived From The Mixture Biomass As Energy Storage Materials

The ever increasing demand for renewable energy to relieve the reliance on fossil fuel has stimulated great interest in electrochemical energy conversion and storage.The carbon materials possess the unique properties of accessible raw materials,good electricity conductivity and high stable ability,which have attracted widely attention as energy storage materials.Most of researcher prepares porous carbon derived from single biomass,however,the porous carbons are prepared with this route possess large surface area or hierarchical porous structure,which is limited to further boost the electrical performance of carbon materials in energy storage.In this work,we use the mixture waste of low ash biomass and high ash biomass as precursor to fabricate super-hierarchical porosity structure and ultrahigh specific surface area,which exhibits outstanding electrochemical material for energy storage,the specific researches contents as follow:?1?The super-hierarchical porous structure carbon derived from the mixture with sludge sewage and coconut shell for energy storage: The sludge sewage and coconut are mixed with hydrothermal carbonization,and then the filtration of solid products is washed with HCl,the precursor is activated with KOH to fabricated super-hierarchical porous carbon with large pore volume(2.04 cm³ g^-1)and high specific surface area(3003 m² g^-1).As electrode materials for energy storage,the super-hierarchical porous carbon present a high specific capacitance(420 F g^-1,0.5 A g^-1),remarkable cycling stability and high energy density.?2?The super developed hierarchical porous sturecture carbon synthesized with the mixture of crab shells and rice husks for electrochemical performance researches: The crab shells and rice husks are chosen as raw materials,which are mixed with hydrothermal carbonization,acid treatment with precursor and combined with KOH activation for super develop hierarchical porous carbon with ultrahigh specific surface area(3557 m² g^-1).In thewhole process,the bioceramic template as template for fabricating hierarchical porous structure and improve specific surface area.For the investigation of electrochemical performance,the super developed hierarchical porous carbon exhibits a large specific capacitance 453 F g^-1,outstanding lifespan and high energy density(30.5 Wh Kg^-1)in Na₂SO₄ electrolyte aqoues.