Waffle-Like Carbons Combined with Enriched Mesopores and Highly Heteroatom-Doped Derived from Sandwiched MOF/LDH/MOF for High-Rate Supercapacitor
Supercapacitors (SCs) are promising for powering mobile devices, electric vehicles and smart power grids due to their fast charge/discharge rate, high power capability and robust cycle stability. Nitrogen-doped porous carbons are great alternatives because they provide pseudocapacitance without losi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-11-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/12/2388 |
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| author | Szu-Chen Wu Po-Hsueh Chang Syun-Hong Chou Chih-Yang Huang Ta-Chung Liu Cheng-Hsiung Peng |
| author_facet | Szu-Chen Wu Po-Hsueh Chang Syun-Hong Chou Chih-Yang Huang Ta-Chung Liu Cheng-Hsiung Peng |
| author_sort | Szu-Chen Wu |
| collection | DOAJ |
| description | Supercapacitors (SCs) are promising for powering mobile devices, electric vehicles and smart power grids due to their fast charge/discharge rate, high power capability and robust cycle stability. Nitrogen-doped porous carbons are great alternatives because they provide pseudocapacitance without losing their power rate. Nanoporous carbon derived from metal organic frameworks (MOFs) is an ideal precursor for preparing heteroatom-doped carbons due to their abundant nitrogen contents and incredible specific surface areas. However, severe aggregations and the leakage of nitrogen can occur during harsh carbonization. In this study, we used CoAl-LDH (cobalt aluminum layered double hydroxide) as an in-situ growth substrate, allowing Co-based MOF to uniformly grow onto the CoAl-LDH to form a sandwiched MOF/LDH/MOF structure. After acid etching, we obtained waffle-like nanoporous carbons (WNPC). WNPC exhibited high nitrogen and oxygen retention (7.5 wt% and 9.1 wt%) and a broad mesopores distribution with specific surface areas of 594 m<sup>2</sup>g<sup>−1</sup>, which promoted a sieving effect. This renders a specific capacitance of 300.7 F·g<sup>−1</sup> at 1 A·g<sup>−1</sup> and the high retention (72%) of capacitance at 20 A·g<sup>−1</sup>, ensuring its use at high-rate supercapacitor electrodes. Finally, the WNPC symmetric supercapacitor reaches a superior specific energy of 27 W·h·kg<sup>−1</sup> at a power of 500 W·kg<sup>−1</sup>, and a good cycle stability (85% capacitance retention after 10,000 cycles). |
| first_indexed | 2024-03-10T14:27:00Z |
| format | Article |
| id | doaj.art-40b64bb8c3ce4286892720eb3e58ee4c |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T14:27:00Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-40b64bb8c3ce4286892720eb3e58ee4c2023-11-20T22:54:59ZengMDPI AGNanomaterials2079-49912020-11-011012238810.3390/nano10122388Waffle-Like Carbons Combined with Enriched Mesopores and Highly Heteroatom-Doped Derived from Sandwiched MOF/LDH/MOF for High-Rate SupercapacitorSzu-Chen Wu0Po-Hsueh Chang1Syun-Hong Chou2Chih-Yang Huang3Ta-Chung Liu4Cheng-Hsiung Peng5Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, TaiwanDepartment of Chemical and Materials Engineering, MingHsin University of Science and Technology, 1 Xinxing Road, Xinfeng, Hsinchu 304, TaiwanDepartment of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, TaiwanDepartment of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, TaiwanDepartment of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, TaiwanDepartment of Chemical and Materials Engineering, MingHsin University of Science and Technology, 1 Xinxing Road, Xinfeng, Hsinchu 304, TaiwanSupercapacitors (SCs) are promising for powering mobile devices, electric vehicles and smart power grids due to their fast charge/discharge rate, high power capability and robust cycle stability. Nitrogen-doped porous carbons are great alternatives because they provide pseudocapacitance without losing their power rate. Nanoporous carbon derived from metal organic frameworks (MOFs) is an ideal precursor for preparing heteroatom-doped carbons due to their abundant nitrogen contents and incredible specific surface areas. However, severe aggregations and the leakage of nitrogen can occur during harsh carbonization. In this study, we used CoAl-LDH (cobalt aluminum layered double hydroxide) as an in-situ growth substrate, allowing Co-based MOF to uniformly grow onto the CoAl-LDH to form a sandwiched MOF/LDH/MOF structure. After acid etching, we obtained waffle-like nanoporous carbons (WNPC). WNPC exhibited high nitrogen and oxygen retention (7.5 wt% and 9.1 wt%) and a broad mesopores distribution with specific surface areas of 594 m<sup>2</sup>g<sup>−1</sup>, which promoted a sieving effect. This renders a specific capacitance of 300.7 F·g<sup>−1</sup> at 1 A·g<sup>−1</sup> and the high retention (72%) of capacitance at 20 A·g<sup>−1</sup>, ensuring its use at high-rate supercapacitor electrodes. Finally, the WNPC symmetric supercapacitor reaches a superior specific energy of 27 W·h·kg<sup>−1</sup> at a power of 500 W·kg<sup>−1</sup>, and a good cycle stability (85% capacitance retention after 10,000 cycles).https://www.mdpi.com/2079-4991/10/12/2388supercapacitorswaffle-like nanoporous carbonnitrogen-dopedsieving effectmetal-organic framework |
| spellingShingle | Szu-Chen Wu Po-Hsueh Chang Syun-Hong Chou Chih-Yang Huang Ta-Chung Liu Cheng-Hsiung Peng Waffle-Like Carbons Combined with Enriched Mesopores and Highly Heteroatom-Doped Derived from Sandwiched MOF/LDH/MOF for High-Rate Supercapacitor Nanomaterials supercapacitors waffle-like nanoporous carbon nitrogen-doped sieving effect metal-organic framework |
| title | Waffle-Like Carbons Combined with Enriched Mesopores and Highly Heteroatom-Doped Derived from Sandwiched MOF/LDH/MOF for High-Rate Supercapacitor |
| title_full | Waffle-Like Carbons Combined with Enriched Mesopores and Highly Heteroatom-Doped Derived from Sandwiched MOF/LDH/MOF for High-Rate Supercapacitor |
| title_fullStr | Waffle-Like Carbons Combined with Enriched Mesopores and Highly Heteroatom-Doped Derived from Sandwiched MOF/LDH/MOF for High-Rate Supercapacitor |
| title_full_unstemmed | Waffle-Like Carbons Combined with Enriched Mesopores and Highly Heteroatom-Doped Derived from Sandwiched MOF/LDH/MOF for High-Rate Supercapacitor |
| title_short | Waffle-Like Carbons Combined with Enriched Mesopores and Highly Heteroatom-Doped Derived from Sandwiched MOF/LDH/MOF for High-Rate Supercapacitor |
| title_sort | waffle like carbons combined with enriched mesopores and highly heteroatom doped derived from sandwiched mof ldh mof for high rate supercapacitor |
| topic | supercapacitors waffle-like nanoporous carbon nitrogen-doped sieving effect metal-organic framework |
| url | https://www.mdpi.com/2079-4991/10/12/2388 |
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