Preparation and Electrochemical Performance of Nitrogen-DopedNanocarbon Coated MnO Composites
摘 要
利用静电引力在MnO2纳米线表面吸附盐酸处理的三聚氰胺(H-melamine),H-melamine和MnO2纳米线的质量比分别为1\:1,3\:1,5\:1,然后进行退火以制备氮掺杂纳米碳包覆MnO(MnO@N-C)复合材料,研究了复合材料的物相组成、微观结构和电化学性能。结果表明:退火处理使得MnO2纳米线和包覆在其表面的H-melamine分别转变为MnO及氮掺杂碳材料,得到的MnO@N-C复合材料呈现串珠状形貌;当H-melamine与MnO2纳米线的质量比为3\:1时,复合材料的电化学性能最佳,在1 A·g-1电流密度下表现出1 050 F·g-1的超高比电容,并且在3 A·g-1电流密度下经6 000次充放电循环后具有75%的容量保持率。以复合材料为正极、活性炭为负极组装的锌离子混合超级电容器的工作电压范围可达0~2.0 V,且表现出72 W·h·kg-1的能量密度;在3 A·g-1的电流密度下经过5 000次循环后,超级电容器仍能保持88%的初始比电容。
Abstract
Assisted by electrostatic force, MnO2 nanowires were hybridized with hydrochloric acid treated melamine (H-melamine), with mass ratios of H-melamine to MnO2 nanowires of 1\:1, 3\:1 and 5\:1, respectively, and then was annealed to fabricate nitrogen-doped nanocarbon coated MnO (MnO@N-C) composites. The phase composition, microstructure and electrochemical performance of the composite were studied. The results show that the MnO2 nanowires and surface-coated H-melamine were transformed to MnO and nitrogen-doped carbon materials, respectively, by annealing, and the obtained MnO@N-C composite showed beadlike morphology. When the mass ratio of H-melamine to MnO2 nanowires was 3\:1, the composite achieved the best electrochemical performance, exhibiting high specific capacitance of 1 050 F·g-1 at the current density of 1 A·g-1 and capacitance retention of 75% after 6 000 charge/discharge cycles at 3 A·g-1 current density. The zinc-ion hybrid supercapacitor assembled with the composite as cathode and activated carbon as anode could operate in the voltage window of 0-2.0 V, and showed an energy density of 72 W·h·kg-1. After 5 000 cycles at the current density of 3 A·g-1, the supercapacitor still maintained 88% of the initial specific capacitance.
中图分类号 TM242 DOI 10.11973/jxgccl202306010
所属栏目 新材料 新工艺
基金项目 上海市自然科学基金资助项目(21ZR1445700)
收稿日期 2022/6/12
修改稿日期 2023/5/11
网络出版日期
作者单位点击查看
联系人作者赵斌
备注任昊(1996-),男,山西霍州人,硕士研究生
引用该论文: REN Hao,LI Tianpeng,ZHANG Xiaofeng,ZHAO Bin. Preparation and Electrochemical Performance of Nitrogen-DopedNanocarbon Coated MnO Composites[J]. Materials for mechancial engineering, 2023, 47(6): 53~60
任昊,李天鹏,张晓峰,赵斌. 氮掺杂纳米碳包覆MnO复合材料的制备与电化学性能[J]. 机械工程材料, 2023, 47(6): 53~60
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【10】LI W J,GAO X,CHEN Z Y,et al.Electrochemically activated MnO cathodes for high performance aqueous zinc-ion battery[J].Chemical Engineering Journal,2020,402:125509.
【11】BARAL A,SATISH L,DAS D P,et al.Construing the interactions between MnO2 nanoparticle and bovine serum albumin:Insight into the structure and stability of a protein-nanoparticle complex[J].New Journal of Chemistry,2017,41(16):8130-8139.
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【25】SAHOO D,SHAKYA J,CHOUDHURY S,et al.High-performance MnO2 nanowire/MoS2 nanosheet composite for a symmetrical solid-state supercapacitor[J].ACS Omega,2022,7(20):16895-16905.
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