Effect of De-Ashing Strategies on Pore Structure and Electrochemical Performance of Activated Carbons for Supercapacitors
<p>The ash was removed before or after carbonization of potassium humate to investigate the effect of ash removal methods on pore structure and electrochemical performance of activated carbons for supercapacitors. The activated carbons were prepared by direct carbonization of potassium humate...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Kaunas University of Technology
2018-08-01
|
| Series: | Medžiagotyra |
| Subjects: | |
| Online Access: | http://matsc.ktu.lt/index.php/MatSc/article/view/18505 |
| _version_ | 1828860675285319680 |
|---|---|
| author | Weiwei KANG Guangxu HUANG Qianhao GENG Wentao HOU Youheng YAO Bing XU Baolin XING Chuanxiang ZHANG |
| author_facet | Weiwei KANG Guangxu HUANG Qianhao GENG Wentao HOU Youheng YAO Bing XU Baolin XING Chuanxiang ZHANG |
| author_sort | Weiwei KANG |
| collection | DOAJ |
| description | <p>The ash was removed before or after carbonization of potassium humate to investigate the effect of ash removal methods on pore structure and electrochemical performance of activated carbons for supercapacitors. The activated carbons were prepared by direct carbonization of potassium humate at 700 ℃ for 1 hour under N<sub>2</sub> atmosphere with different de-ashing strategies. It was found that ash removal before carbonization was an effective strategy to reduce the ash content of the corresponding activated carbon. When de-ashing treatment was adopted after carbonization, part of the ash in activated carbon was coated with carbon and could not be removed through acid soaking. Moreover, ash removal before carbonization could better contribute to creating the micropores and the ash removed after carbonization performed as templates to mainly generate mesopores. The activated carbon with ash removed before carbonization as electrodes delivered a specific capacitance of 164.84 F/g at a current density of 50 mA/g, and exhibited typical electric double layer capacitive performance as well as lower leakage current of 15.3 µA.</p><p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.24.3.18505">http://dx.doi.org/10.5755/j01.ms.24.3.18505</a></p> |
| first_indexed | 2024-12-13T02:44:59Z |
| format | Article |
| id | doaj.art-06d8a58a8ebc49b6a9d59d11bbf5b209 |
| institution | Directory Open Access Journal |
| issn | 1392-1320 2029-7289 |
| language | English |
| last_indexed | 2024-12-13T02:44:59Z |
| publishDate | 2018-08-01 |
| publisher | Kaunas University of Technology |
| record_format | Article |
| series | Medžiagotyra |
| spelling | doaj.art-06d8a58a8ebc49b6a9d59d11bbf5b2092022-12-22T00:02:12ZengKaunas University of TechnologyMedžiagotyra1392-13202029-72892018-08-0124324725210.5755/j01.ms.24.3.185059137Effect of De-Ashing Strategies on Pore Structure and Electrochemical Performance of Activated Carbons for SupercapacitorsWeiwei KANG0Guangxu HUANG1Qianhao GENGWentao HOU2Youheng YAO3Bing XUBaolin XING4Chuanxiang ZHANG5College of Chemistry and Chemical Engineering of Henan Polytechnic UniversityCollege of Chemistry and Chemical Engineering of Henan Polytechnic UniversityCollege of Chemistry and Chemical Engineering of Henan Polytechnic UniversityCollege of Chemistry and Chemical Engineering of Henan Polytechnic UniversityCollege of Chemistry and Chemical Engineering of Henan Polytechnic UniversityCollege of Chemistry and Chemical Engineering of Henan Polytechnic University<p>The ash was removed before or after carbonization of potassium humate to investigate the effect of ash removal methods on pore structure and electrochemical performance of activated carbons for supercapacitors. The activated carbons were prepared by direct carbonization of potassium humate at 700 ℃ for 1 hour under N<sub>2</sub> atmosphere with different de-ashing strategies. It was found that ash removal before carbonization was an effective strategy to reduce the ash content of the corresponding activated carbon. When de-ashing treatment was adopted after carbonization, part of the ash in activated carbon was coated with carbon and could not be removed through acid soaking. Moreover, ash removal before carbonization could better contribute to creating the micropores and the ash removed after carbonization performed as templates to mainly generate mesopores. The activated carbon with ash removed before carbonization as electrodes delivered a specific capacitance of 164.84 F/g at a current density of 50 mA/g, and exhibited typical electric double layer capacitive performance as well as lower leakage current of 15.3 µA.</p><p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.24.3.18505">http://dx.doi.org/10.5755/j01.ms.24.3.18505</a></p>http://matsc.ktu.lt/index.php/MatSc/article/view/18505ash removalactivated carbonpotassium humatetemplatemesopores |
| spellingShingle | Weiwei KANG Guangxu HUANG Qianhao GENG Wentao HOU Youheng YAO Bing XU Baolin XING Chuanxiang ZHANG Effect of De-Ashing Strategies on Pore Structure and Electrochemical Performance of Activated Carbons for Supercapacitors Medžiagotyra ash removal activated carbon potassium humate template mesopores |
| title | Effect of De-Ashing Strategies on Pore Structure and Electrochemical Performance of Activated Carbons for Supercapacitors |
| title_full | Effect of De-Ashing Strategies on Pore Structure and Electrochemical Performance of Activated Carbons for Supercapacitors |
| title_fullStr | Effect of De-Ashing Strategies on Pore Structure and Electrochemical Performance of Activated Carbons for Supercapacitors |
| title_full_unstemmed | Effect of De-Ashing Strategies on Pore Structure and Electrochemical Performance of Activated Carbons for Supercapacitors |
| title_short | Effect of De-Ashing Strategies on Pore Structure and Electrochemical Performance of Activated Carbons for Supercapacitors |
| title_sort | effect of de ashing strategies on pore structure and electrochemical performance of activated carbons for supercapacitors |
| topic | ash removal activated carbon potassium humate template mesopores |
| url | http://matsc.ktu.lt/index.php/MatSc/article/view/18505 |
| work_keys_str_mv | AT weiweikang effectofdeashingstrategiesonporestructureandelectrochemicalperformanceofactivatedcarbonsforsupercapacitors AT guangxuhuang effectofdeashingstrategiesonporestructureandelectrochemicalperformanceofactivatedcarbonsforsupercapacitors AT qianhaogeng effectofdeashingstrategiesonporestructureandelectrochemicalperformanceofactivatedcarbonsforsupercapacitors AT wentaohou effectofdeashingstrategiesonporestructureandelectrochemicalperformanceofactivatedcarbonsforsupercapacitors AT youhengyao effectofdeashingstrategiesonporestructureandelectrochemicalperformanceofactivatedcarbonsforsupercapacitors AT bingxu effectofdeashingstrategiesonporestructureandelectrochemicalperformanceofactivatedcarbonsforsupercapacitors AT baolinxing effectofdeashingstrategiesonporestructureandelectrochemicalperformanceofactivatedcarbonsforsupercapacitors AT chuanxiangzhang effectofdeashingstrategiesonporestructureandelectrochemicalperformanceofactivatedcarbonsforsupercapacitors |