MnO2 nanoparticles anchored on carbon nanotubes with hybrid supercapacitor-battery behavior for ultrafast lithium storage

Tailoring carboxyl tubular carbon nanofibers/MnO2 composites for high‐performance lithium‐ion battery anodes

“…The XRD spectrum of δ-MnO 2 and α-MnO 2 was consistent with the previously reported results. 37,38 Based on the SEM ( Figure 2) and XRD ( Figure 4A) results, we consider the formation mechanism of hydrothermal time to control the formation of CMTCFs@MNS, CMTCFs@MNS-W and CMTCFs/MNW in three steps. Firstly, δ-MnO 2 nanosheets nucleated and grew on the surface of CMTCFs in hydrothermal environment.…”

Macroscopic Carbon Nanotube Structures for Lithium Batteries

“…d) Schematic of the fabrication process of MnO 2 /aCNT composites. Reproduced with permission . Copyright 2018, Elsevier, Inc. e) SEM and optical images of a 3D SACNT‐aerogel‐based electrode.…”

“…Besides, low conductivity and initial coulombic efficiency severely affect their electrochemical performance. Through thermal decomposition, sol–gel, and physical vapor deposition methods, a series of binder‐free TMO/SACNT composite electrodes (Mn 3 O 4 , Co 3 O 4 , Fe 3 O 4 , MnO 2 , and TiO 2 ) were successfully prepared, based on the 2D macroscopic architecture of SACNTs (Figure b–d) . By regulating experimental parameters, such as precursor concentration and reaction time, all these composite electrodes showed remarkable mechanical properties and electrochemical performance, especially the rate performance, which profited from the high conductivity of SACNTs.…”

“…The Fe 3 O 4 –SACNT electrode delivered a reversible capacity over 800 mAh g −1 at a current density of 0.1 A g −1 based on the total mass of the electrode . Through in‐situ redox reaction of KMnO 4 and air‐oxidized SACNTs (aCNTs), MnO 2 /aCNT electrodes were fabricated and showed capacitive characteristics, which provided the basis for ultrafast lithium storage (Figure d) …”

Hierarchical structure N, O-co-doped porous carbon/carbon nanotube composite derived from coal for supercapacitors and CO2 capture

“…With excellent physical and chemical stability, low gravimetric density, and excellent electronic conductivity, carbon nanotubes (CNTs) have been used widely in energy conversion and storage. [17][18][19] CNTs attached to the edges and surface of porous carbon as spacers can increase the electrolyte solutionaccessible surface area and provide electrical conduction pathways. On the other hand, adding CNTs can build hierarchically porous structures.…”