Cobalt-nickel silicate hydroxide on amorphous carbon derived from bamboo leaves for hybrid supercapacitors

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 375; p. 121938
• Main Authors: Zhang, Yifu, Wang, Chen, Jiang, Hanmei, Wang, Qiushi, Zheng, Jiqi, Meng, Changgong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2019
• Subjects: Biomass-derived carbon; Cobalt-nickel silicate; Electrochemical performance; Electrode materials; Hierarchical porous structure; Hybrid supercapacitor; Electrochemical performance; Electrode materials; Hierarchical porous structure; Hybrid supercapacitor; Cobalt-nickel silicate; Biomass-derived carbon
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2019.121938

3D hierarchical petal-like CoxNi3−xSi2O5(OH)4/C composites are derived from bamboo leaves and explored to electrode materials for supercapacitor. The CoNiSi/C electrode shows remarkable electrochemical performance with 226 F g−1 (316 C g−1) at 0.5 A g−1 in the voltage window of −0.8 ~ 0.6 V and the retention of 99% after 10,000 cycles. The CoNiSi/C//Ni(OH)2 HSC device achieves the excellent electrochemical performance with the capacitance of 254 mF cm−2 (64 F g−1) at 2 mA cm−2, energy density of 1.3 Wh m−2 (20.6 Wh kg−1) at power density of 4 W m−2 (63.3 W kg−1) and cycle stability with 82% after 10,000 cycles. [Display omitted] •3D hierarchical petal-like CoNiSi/C composites are derived from bamboo leaves.•CoNiSi/C shows the performance with 226 F g−1 (316 C g−1) at 0.5 A g−1.•CoNiSi/C exhibits the excellent retention of 99% after 10,000 cycles.•The HSC device achieves 254 mF cm−2 at 2 mA cm−2, 0.793 Wh m−2 at 3.75 W m−2.•The HSC device exhibits high cycle stability with 82% after 10,000 cycles. 3D hierarchical cobalt-nickel silicate hydroxide/C (CoxNi3−xSi2O5(OH)4, denoted as CoNiSi) composites are derived from bamboo leaves and explored as electrode materials for supercapacitor. The CoNiSi architectures with hierarchical petal-like shapes are in-situ generated on 3D amorphous carbon derived from bamboo leaves using the biomass-inherent SiO2 species as the silicon source. The CoNiSi/C electrode shows a 3D hierarchical porous structure, high specific surface area and remarkable electrochemical performance with 226 F g−1 at 0.5 A g−1 in the voltage window of −0.8 ~ 0.6 V, which is superior to the specific capacitances of SiO2/C, CoSi/C, NiSi/C and even the reported values of silicates-based materials. It also achieves excellent cycling performance with 99% after 10,000 cycles. Moreover, a high-performance solid-state hybrid supercapacitor (HSC) device is fabricated by CoNiSi/C and Ni(OH)2. This HSC device achieves an outstanding electrochemical performance with the capacitance up to 254 mF cm−2 (64 F g−1) at 2 mA cm−2, and the energy density up to 0.793 Wh m−2 (20.0 Wh kg−1) at 3.75 W m−2 (94.5 W kg−1), which are higher than a majority of former SCs based on silicates. Besides, the HSC device shows good cycle stability with 82% after 10,000 cycles and can light the red LED lasting for more than 2 min. These features demonstrate that the 3D CoNiSi/C architectures can be considered as a promising and efficient material for SCs with high performance.