Purification and Characterization of Carbon Nanotubes and the Formation of Magnetic Semiconductors for the Spintronic Application

Amente, Chernet; Dharamvir, Keya

doi:10.11648/j.sr.20150303.22

Cited by 3 publications

(1 citation statement)

References 29 publications

(32 reference statements)

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“…Figure e shows the XRD profiles of NiO, NiO-CNT, and NiO–Fe-CNT. The XRD patterns of NiO, NiO-CNT, and NiO–Fe-CNT contain major peaks at 26.12, 32.2, 37.8, 43.8, 52, 63.4, and 76° corresponding to planes at (002), (002), (022), (111), (004), (220), and (311), respectively. ,− The XRD peak at ∼ 44° corresponds to the (200) plane of NiO (JCPDS no. 47-1049). , The presence of XRD peaks at 26.12° (002) for NiO-CNT and 52° (004) for NiO–Fe-CNT confirms the presence of MWCNTs (JCPDS no.…”

Section: Resultsmentioning

confidence: 99%

Supercapacitor Performance of NiO, NiO-MWCNT, and NiO–Fe-MWCNT Composites

Shah,

Senapati,

Murthy

et al. 2023

ACS Omega

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The NiO-CNT and NiO–Fe-CNT composites that have been prepared from waste high density polyethylene plastic and their carbon nanotube (CNT) quality-dependent supercapacitance tuning have been reported here. Multiwalled CNT (MWCNT) formation has been confirmed from TEM and Raman spectra with an I D/I G ratio of 0.77, which stands for high graphitization. The specific surface area (SSA) of MWCNTs in the NiO–Fe-CNT composite was 87.8 m2/g, while in the NiO-CNT composite, it was 25 m2/g. NiO–Fe-CNT displayed higher specific capacitance and energy density (1360 Fg–1 and 1180 W h kg–1) than NiO-CNT (1250 Fg–1 and 1000 W h kg–1), which may be due to the presence of higher-quality MWCNTs in the NiO–Fe-CNT composite. NiO–Fe-CNT displayed higher contributions of electric double-layer capacitor (59%) behavior compared to NiO-CNT (38%) and represented a hybrid supercapacitor. NiO–Fe-CNT also displayed a capacitive retention of 96% after 1000 charge–discharge cycles. Furthermore, studies in acidic electrolytes revealed higher performance of NiO–Fe-CNT than NiO-CNT, displaying specific capacitances of NiO–Fe-CNT to be 1147 Fg–1 in 2 M H2SO4 and 943 Fg–1 in 2 M HCl. It has been qualitatively explored that the quality of CNTs, SSA, and quantum confinement effects in the composites may be the factors responsible for the performance difference in NiO–Fe-CNT and NiO-CNT. The present work is geared toward the low-cost fabrication of high-quality CNT composites for supercapacitors and energy storage applications. The present work also contributes quantitatively to the understanding of CNT quality as an important parameter for the performance of CNT-composite-based supercapacitors.

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