Nickel silicate hydroxide on hierarchically porous carbon derived from rice husks as high-performance electrode material for supercapacitors

超级电容器 去壳 材料科学 硅酸盐 多孔性 化学工程 电极 氢氧化物 碳纤维 氢氧化钾 冶金 电容 化学 复合材料 复合数 工程类 物理化学 生物 植物
作者
Hui Wang,Min Wang,Jingjing Wang
出处
期刊:International Journal of Hydrogen Energy [Elsevier BV]
卷期号:46 (71): 35351-35364 被引量:18
标识
DOI:10.1016/j.ijhydene.2021.08.062
摘要

Nickel silicate hydroxide on hierarchically porous carbon derived from rice husks is prepared as electrode material for supercapacitors. AAEMs 1 in rice husks and CO 2 promote the development of pores, which act as pore-forming agent and catalyst respectively. The rice husks carbon is used as the substrate and the SiO 2 in rice husks is converted into Ni–Si compound by loading Ni. The C/NiSi-600-1 shows remarkable electrochemical performance with 237.07 F/g at 0.5 A/g. The performance declines with crystalline SiO 2 formed above 900 °C. A high-performance asymmetric water-system supercapacitor device is fabricated by C/NiSi-600-1 and activated carbon. This device shows capacitance of 142 mF/cm 2 at 4 mA/cm 2 , the energy density of 25.24 Wh/kg at 551.4 W/kg and great cycle stability with 90% after 10,000 cycles. This work provides new insights into the green application of rice husks and promotes the development of electrode materials for supercapacitors. Hierarchically porous rice husks-based nickel-silicon hydroxide composites are prepared by hydrothermal method. Alkali and alkaline earth metals in rice husks and CO 2 promote the development of pores. The SiO 2 anchored on the carbon is converted into Ni-Si compound. The C/NiSi-600-1 shows remarkable electrochemical performance with 237.07 F/g at 0.5 A/g. The C/NiSi-600-1//activated carbon asymmetric supercapacitor device achieves excellent electrochemical performance with energy density of 5.04 m Wh/cm 3 at power density of 110.1 mW/cm 3 and cycle stability with 90% after 10,000 cycles. • Hierarchically porous rice husks-based nickel-silicon hydroxide was prepared. • The AAEMs and CO 2 promote the production of hierarchical pores. • The optimal Ni-Si ratio at different carbonization temperature is investigated. • The best temperature is 600 °C, and C/NiSi-600-1 performs 237.07 F/g at 0.5 A/g. • The electrochemical performance declines above 900 °C when crystalline SiO 2 formed.

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