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Article

Nest-Like MnO2 Nanowire/Hierarchical Porous Carbon Composite for High-Performance Supercapacitor from Oily Sludge

1
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2
College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
3
State Grid Shandong Electric Power Research Institute, Jinan 250003, China
*
Author to whom correspondence should be addressed.
Academic Editor: Byoung-Suhk Kim
Nanomaterials 2021, 11(10), 2715; https://doi.org/10.3390/nano11102715
Received: 4 September 2021 / Revised: 10 October 2021 / Accepted: 12 October 2021 / Published: 14 October 2021
In the aim to go beyond the performance tradeoffs of classic electric double-layer capacitance and pseudo-capacitance, composites made out of carbon and pseudo-capacitive materials have been a hot-spot strategy. In this paper, a nest-like MnO2 nanowire/hierarchical porous carbon (HPC) composite (MPC) was successfully fabricated by a controllable in situ chemical co-precipitation method from oily sludge waste. Due to the advantages of high surface area and fast charge transfer for HPC as well as the large pseudo-capacitance for MnO2 nanowires, the as-prepared MPC has good capacitance performance with a specific capacitance of 437.9 F g−1 at 0.5 A g−1, favorable rate capability of 79.2% retention at 20 A g−1, and long-term cycle stability of 78.5% retention after 5000 cycles at 5 A g−1. Meanwhile, an asymmetric supercapacitor (ASC) was assembled using MPC as the cathode while HPC was the anode, which exhibits a superior energy density of 58.67 W h kg−1 at the corresponding power density of 498.8 W kg−1. These extraordinary electrochemical properties highlight the prospect of our waste-derived composites electrode material to replace conventional electrode materials for a high-performance supercapacitor. View Full-Text
Keywords: supercapacitors; MnO2 nanowires; hierarchical porous carbon; oily sludge supercapacitors; MnO2 nanowires; hierarchical porous carbon; oily sludge
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MDPI and ACS Style

Li, X.; Han, D.; Gong, Z.; Wang, Z. Nest-Like MnO2 Nanowire/Hierarchical Porous Carbon Composite for High-Performance Supercapacitor from Oily Sludge. Nanomaterials 2021, 11, 2715. https://doi.org/10.3390/nano11102715

AMA Style

Li X, Han D, Gong Z, Wang Z. Nest-Like MnO2 Nanowire/Hierarchical Porous Carbon Composite for High-Performance Supercapacitor from Oily Sludge. Nanomaterials. 2021; 11(10):2715. https://doi.org/10.3390/nano11102715

Chicago/Turabian Style

Li, Xiaoyu, Dong Han, Zhiqiang Gong, and Zhenbo Wang. 2021. "Nest-Like MnO2 Nanowire/Hierarchical Porous Carbon Composite for High-Performance Supercapacitor from Oily Sludge" Nanomaterials 11, no. 10: 2715. https://doi.org/10.3390/nano11102715

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