Tian Shubing, Zhang Baoling, Han Dong, Gong Zhiqiang, Li Xiaoyu
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
College of New Energy, China University of Petroleum (East China), Qingdao 266580, China.
Nanomaterials (Basel). 2022 Oct 28;12(21):3819. doi: 10.3390/nano12213819.
It is urgent to improve the electrochemical performance of anode for supercapacitors. Herein, we successfully prepare FeO/porous carbon composite materials (FPC) through hydrothermal strategies by using oily sludge waste. The hierarchical porous carbon (HPC) substrate and fine loading of FeO nanorods are all important for the electrochemical performance. The HPC substrate could not only promote the surface capacitance effect but also improve the utilization efficiency of FeO to enhance the pseudo-capacitance. The smaller and uniform FeO loading is also beneficial to optimize the pore structure of the electrode and enlarge the interface for faradaic reactions. The as-prepared FPC shows a high specific capacitance of 465 F g at 0.5 A g, good rate capability of 66.5% retention at 20 A g, and long cycling stability of 88.4% retention at 5 A g after 4000 cycles. In addition, an asymmetric supercapacitor device (ASC) constructed with FPC as the anode and MnO/porous carbon composite (MPC) as the cathode shows an excellent power density of 72.3 W h kg at the corresponding power density of 500 W kg with long-term cycling stability. Owing to the outstanding electrochemical characteristics and cycling performance, the associated materials' design concept from oily sludge waste has large potential in energy storage applications and environmental protection.
提高超级电容器阳极的电化学性能迫在眉睫。在此，我们通过水热法成功地利用含油污泥废弃物制备了FeO/多孔碳复合材料（FPC）。分级多孔碳（HPC）基底和FeO纳米棒的精细负载对电化学性能都很重要。HPC基底不仅可以促进表面电容效应，还能提高FeO的利用效率以增强赝电容。较小且均匀的FeO负载也有利于优化电极的孔隙结构并扩大法拉第反应的界面。所制备的FPC在0.5 A g时表现出465 F g的高比电容，在20 A g时具有66.5%的良好倍率性能保持率，在5 A g下经过4000次循环后具有88.4%的长循环稳定性保持率。此外，以FPC为阳极、MnO/多孔碳复合材料（MPC）为阴极构建的非对称超级电容器装置（ASC）在相应功率密度为500 W kg时表现出72.3 W h kg的优异功率密度以及长期循环稳定性。由于其出色的电化学特性和循环性能，这种从含油污泥废弃物出发的相关材料设计理念在储能应用和环境保护方面具有巨大潜力。
