梯级孔生物质活性炭的制备及其电容特性研究

doi:10.11896/j.issn.1005-023X.2018.19.005

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Abstract Biomass activated carbons used as electrode materials for supercapacitors were prepared from shaddock peel via preliminary carbonization coupled with KOH activation. The microstructures including pore structure and surface morphology and the surface chemistry property of biomass activated carbons were characterized by low temperature N₂ adsorption, scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). The electrochemical characteristics of biomass activated carbons applied as electrode materials were also investigated using galvanostatic charge-discharge, cyclic voltammetry and leakage current. The results show that high quality biomass activated carbons with specific surface area of 1 347—2 269 m²/g, total pore volume of 0.642-1.283 cm³/g, mesopore percentage of 23.83%-48.90% were obtained from shaddock peel through preliminary carbonization coupled with KOH activation routes. The as-prepared biomass activated carbons exhibited well-developed specific surface area with “macropore-mesopore-micropore” three dimensional interconnected hierarchical pore structure and contained some oxygen-containing functional groups such as carbonyl, phenolic hydroxyl and carboxyl on the surface of these activated carbons, which might become a promising electrode materials for supercapacitors. Biomass activated carbon electrode materials exhibited an excellent capacitance characteristics and superior cycling performance in KOH aqueous electrolyte. The maximum gravimetric specific capacitance of biomass activated carbon electrode materials was as high as 243 F/g at a current density of 50 mA/g and still remained 175 F/g even at a current density of 5 000 mA/g, the leakage current was only 0.006 3 mA and 93.34% of the initial specific capacitance was retained after 1 000 cycles. The superior electrochemical performances of biomass activated carbons were strongly depended on their well-developed specific surface area, macropore-mesopore-micropore three dimensional interconnected hierarchical pore structure, reasonable pore size distribution as well as unique oxygen-enriched surface chemistry property.

Key words： shaddock peel biomass activated carbons supercapacitors electrode materials capacitance characteristics

Published: 18 October 2018

CLC number:

TQ424.1

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	Articles by authors
	SHI Changliang
	XING Baolin
	ZENG Huihui
	ZHANG Shuangjie
	GUO Hui
	JIA Jianbo
	ZHANG Chuanxiang
	TIAN Ye
	ZHU Ahui
	ZHANG Qingshan

Cite this article:

SHI Changliang,XING Baolin,ZENG Huihui, et al. Preparation of Hierarchical Pore Biomass Activated Carbons and Their Capacitance Characteristics[J]. Materials Reports, 2018, 32(19): 3318-3324.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.19.005 OR http://www.mater-rep.com/EN/Y2018/V32/I19/3318

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