Effect of KOH Dosage on the Physicochemical Properties and Supercapacitor Performance of Coal Gasification Fine Ash Derived Active Carbon

TIAN Xiaodong; CHEN Zhichao; HOU Jian

doi:10.19805/j.cnki.jcspe.2025.230583

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Effect of KOH Dosage on the Physicochemical Properties and Supercapacitor Performance of Coal Gasification Fine Ash Derived Active Carbon

更新时间：2026-02-05

- Effect of KOH Dosage on the Physicochemical Properties and Supercapacitor Performance of Coal Gasification Fine Ash Derived Active Carbon
- Chinese Journal of Power Engineering Vol. 45, Issue 1, Pages: 131-140(2025)
- 作者机构：
  
  哈尔滨工业大学能源工程与科学学院,黑龙江,哈尔滨,150001
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.230583
  CLC： TQ424.1;TM53
- Online First：15 January 2025，
  
  Published：2025
- 稿件说明：
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田晓东,陈智超,侯建. KOH用量对煤气化细灰衍生活性炭理化性质及超级电容器性能的影响动力工程学报, 2025, 45(1): 131-140 https://doi.

org/10.19805/j.cnki.jcspe.2025.230583
田晓东,陈智超,侯建. KOH用量对煤气化细灰衍生活性炭理化性质及超级电容器性能的影响动力工程学报, 2025, 45(1): 131-140 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.230583.

org/10.19805/j.cnki.jcspe.2025.230583 DOI：

摘要

煤气化细灰(CGFA)是煤不完全气化的产物

其具有排放量高和难处理的特点

这导致CGFA面临环境污染与资源浪费的问题。为进一步推动CGFA的可持续化、高值化利用

将CGFA作为碳源

通过低温碱熔耦合KOH活化处理的方法制备了双电层型超级电容器用活性炭

对比了不同KOH用量下活性炭样品的理化特性和电化学性能。结果表明:在脱灰碳(RC)与KOH质量比为1∶1~1∶4的范围内

随着KOH用量的增加

活性炭样品的无序性、比表面积、总孔体积和介孔占比都呈现出逐渐上升的趋势。这些参数越高

活性炭样品的质量比电容越大;当RC与KOH质量比为1∶4时

活性炭样品比表面积为1 938.03 m

/g、总孔体积为1.62 cm

介孔占比为82.82%

质量比电容达到了215.56 F/g(电流密度为1 A/g)

倍率性能为88.66%(电流密度为1~20 A/g);组装所得的对称型超级电容器的能量密度为7.23 (Wh)/kg(对应的功率密度为300 W/kg)

其在100 000圈循环后电容保持率为100.45%。

Abstract

Coal gasification fine ash (CGFA) is the product of incomplete coal gasification

showing the characteristics of high emissions and difficulties of treatment

which leads to the issues of the environmental pollution and resource waste. In order to further promote the sustainable and high-value utilization of CGFA

CGFA was used as a carbon source to prepare activated carbon for electric double layer supercapacitors through low-temperature alkali fusion coup

led KOH activation treatment. The physical and chemical properties and electrochemical properties of activated carbon samples at different KOH dosages were compared. Results show that

in the range of mass ratio of deashing carbon (RC) and KOH from 1∶1 to 1∶4

the disorder

specific surface area (

BET

)

total pore volume (

total

)

and mesopore occupancy (

mes

total

) of the activated carbon samples show a gradual enhancement trend with the increase of KOH dosage. The specific capacitance of the activated carbon sample increase with aforementioned parameters. When

(RC)∶

(KOH)=1∶4

the activated carbon sample exhibited an

BET

of 1 938.03 m

total

of 1.62 cm

mes

total

of 82.82 %

mass specific capacitance of 215.56 F/g (current density is 1 A/g)

and a rate performance of 88.66% (current density is 1-20 A/g). The energy density of the assembled symmetric supercapacitor is 7.23 (Wh)/kg (corresponding to a power density of 300 W/kg)

and its capacitance retention rate is 100.45% after 100 000 cycles.

关键词

Keywords

references

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