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Article

Waffle-Like Carbons Combined with Enriched Mesopores and Highly Heteroatom-Doped Derived from Sandwiched MOF/LDH/MOF for High-Rate Supercapacitor

1
Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan
2
Department of Chemical and Materials Engineering, MingHsin University of Science and Technology, 1 Xinxing Road, Xinfeng, Hsinchu 304, Taiwan
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(12), 2388; https://doi.org/10.3390/nano10122388
Received: 23 October 2020 / Revised: 25 November 2020 / Accepted: 26 November 2020 / Published: 30 November 2020
(This article belongs to the Special Issue Nanocarbon Based Materials)
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 m2g−1, which promoted a sieving effect. This renders a specific capacitance of 300.7 F·g−1 at 1 A·g−1 and the high retention (72%) of capacitance at 20 A·g−1, ensuring its use at high-rate supercapacitor electrodes. Finally, the WNPC symmetric supercapacitor reaches a superior specific energy of 27 W·h·kg−1 at a power of 500 W·kg−1, and a good cycle stability (85% capacitance retention after 10,000 cycles). View Full-Text
Keywords: supercapacitors; waffle-like nanoporous carbon; nitrogen-doped; sieving effect; metal-organic framework supercapacitors; waffle-like nanoporous carbon; nitrogen-doped; sieving effect; metal-organic framework
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MDPI and ACS Style

Wu, S.-C.; Chang, P.-H.; Chou, S.-H.; Huang, C.-Y.; Liu, T.-C.; Peng, C.-H. Waffle-Like Carbons Combined with Enriched Mesopores and Highly Heteroatom-Doped Derived from Sandwiched MOF/LDH/MOF for High-Rate Supercapacitor. Nanomaterials 2020, 10, 2388. https://doi.org/10.3390/nano10122388

AMA Style

Wu S-C, Chang P-H, Chou S-H, Huang C-Y, Liu T-C, Peng C-H. Waffle-Like Carbons Combined with Enriched Mesopores and Highly Heteroatom-Doped Derived from Sandwiched MOF/LDH/MOF for High-Rate Supercapacitor. Nanomaterials. 2020; 10(12):2388. https://doi.org/10.3390/nano10122388

Chicago/Turabian Style

Wu, Szu-Chen, Po-Hsueh Chang, Syun-Hong Chou, Chih-Yang Huang, Ta-Chung Liu, and Cheng-Hsiung Peng. 2020. "Waffle-Like Carbons Combined with Enriched Mesopores and Highly Heteroatom-Doped Derived from Sandwiched MOF/LDH/MOF for High-Rate Supercapacitor" Nanomaterials 10, no. 12: 2388. https://doi.org/10.3390/nano10122388

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