Research progress of biochar materials applied in supercapacitors
Biochar has been widely used in the field of supercapacitors due to their wide source,low price,excellent electrical conductivity,adjustable morphology and strong physicochemical stability.Biochar with excellent comprehen-sive properties of supercapacitors can be obtained continuously by adjusting the porous structure and morphology struc-ture of carbon materials,doping heteroatom,compositing high-capacitance materials,and constructing nano-biochar material.This paper firstly introduces the energy storage mechanism and classification of supercapacitors,subsequently summarizes the structural and elemental characteristics of biomass precursors,and then reviews the various character-ization techniques used in biochar.On this basis,the optimization measures for supercapacitors of biochar are summa-rized from the viewpoints of the morphology of biochar,pore structure,graphite degree,surface functional groups,ele-ment doping and material composite.Then,the research progress of 0,1,2 and 3-dimensional biochar nanomaterial supercapacitors is emphatically introduced in detail.This paper provides an effective research direction for preparing biochar electrode materials for high performance supercapacitors.
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