| Improved capacitance of SBA-15 templated mesoporous carbons after modification with nitric acid oxidation |
| D. W. Wang; F. Li; M. Liu; H. M. Cheng
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| 2007
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| 发表期刊 | New Carbon Materials
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| ISSN | 1007-8827
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| 卷号 | 22期号:4页码:307-314 |
| 摘要 | This study reports modified SBA-15 templated mesoporous carbon as a supercapacitor electrode for high-efficiency energy storage. Mesoporous carbon was oxidized in concentrated nitric acid at 26 degrees C, 50 degrees C, 70 degrees C, and 100 degrees C. The evolution of mesopores and surface oxygen-containing functional groups (SOFGs) of the mesoporous carbons were studied by nitrogen cryosorption, X-ray photoelectron spectroscopy, and thenno-gravimetric analysis. The results demonstrate that the specific surface area and the mesopore volume decrease, while the SOFGs accumulate with increasing oxidation temperature. The supercapacitor performance Was characterized in a KOH aqueous electrolyte. An enhanced energy density with a highest value of 5.7Wh/kg is obtained after oxidation at 100 degrees C compared to 3.5Wh/kg before oxidation, demonstrating the possibility of using modified mesoporous carbons in high energy density applications. The enhanced energy density is attributed to the contribution of SOFGs to charge storage in both the electric double layer and the Faradic reaction. The power density is also improved with a highest value of 3 125 W/kg after oxidation at 76 degrees C compared to the original value of 2 015 W/kg. The improvement of power density relies on the improved wettability of carbon surfaces, which can facilitate the ion transport. |
| 部门归属 | [wang da-wei; li feng; liu min; cheng hui-ming] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china.;cheng, hm (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china;dwwang@imr.ac.cn cheng@imr.ac.cn
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| 关键词 | Mesoporous Carbon
Surface Oxygen Functional Groups
Electrochemical
Properties
Double-layer Capacitance
Activated Carbons
Edlc Performance
Electrodes
Chemistry
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| URL | 查看原文
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| WOS记录号 | WOS:000252044000004
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://ir.imr.ac.cn/handle/321006/33853
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| 专题 | 中国科学院金属研究所
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推荐引用方式
GB/T 7714 |
D. W. Wang,F. Li,M. Liu,et al. Improved capacitance of SBA-15 templated mesoporous carbons after modification with nitric acid oxidation[J]. New Carbon Materials,2007,22(4):307-314.
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| APA |
D. W. Wang,F. Li,M. Liu,&H. M. Cheng.(2007).Improved capacitance of SBA-15 templated mesoporous carbons after modification with nitric acid oxidation.New Carbon Materials,22(4),307-314.
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| MLA |
D. W. Wang,et al."Improved capacitance of SBA-15 templated mesoporous carbons after modification with nitric acid oxidation".New Carbon Materials 22.4(2007):307-314.
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