Nitrogen, Sulfur, and Phosphorus Codoped Hollow Carbon Microtubes Derived from Silver Willow Blossoms as a High-Performance Anode for Sodium-Ion Batteries

Abstract

Hard carbon materials have been considered as one of the most promising candidates as the anode in sodium-ion batteries. However, scale application of state-of-the-art hard carbon anodes is still hampered on account of their complicated, toxic, and time-consuming preparation techniques. In the present paper, silver willow blossoms composed of natural micrometer-scale fibers are employed to construct N, S, and P codoped hollow carbon microtubes (HCMTs) by direct high-temperature carbonization. The HCMT has a nanoscale wall with several micrometer-sized hollow cavities, which is facilitated to optimize the sodium-ion transfer. In addition, the temperature-dependent, tailorable interlayer spacing coupled with doped heteroatoms is able to provide sufficient energy storage sites. By combining these unique structural advantages, the HCMT exhibits impressive sodium storage performance. The HCMT sample pyrolyzed under 1300 °C is able to deliver a highly reversible capacity of 302 mAh g–1, and after repeated charge/discharge for 100 times, the capacity retains 301 mAh g–1, indicating no visible degradation. Moreover, under a large current density up to 1 A g–1, a high capacity of 201 mAh g–1 is still achieved, demonstrating good rate capability.

Microporous Carbon Nanospheres with Fast Sodium Storage Capability Enabled by Dominant Capacitive Behavior

“…To confirm the good rate performance, we recorded the GCD curves of MHCS-1300 under different current densities, as shown in Figure b. As we know, it is normal for the plateau capacity to decline rapidly as the current density increases, and under an ultrafast charge–discharge rate, e.g., 10 A g –1 , the plateau region almost disappears. − However, here MHCS-1300 has relatively long plateau region no matter how high the current density is. As shown in Figure c, the plateau capacity reaches 53 mAh g –1 under a current density of 10 A g –1 , giving a capacity retention of 52% against the plateau capacity under a current density of 0.1 A g –1 .…”

Surface-driven fast sodium storage enabled by Se-doped honeycomb-like macroporous carbon

“…5b and Table S2 (ESI †) give the comparison of rate performance between Se-HMC-700 and state-of-the-art carbon anodes, including sugarcane waste-derived hard carbon, 44 N-doped carbon, 45 O-doped carbon, 46 B, N co-doped carbon, 47 pitch-based carbon 48 and N, S, P co-doped carbon. 49 It can be observed that most of the carbon materials show relatively low specific capacity below 150 mA h g À1 once the current density reaches 2 A g À1 , much lower than that of Se-HMC-700. In addition to Se-HMC-700, the other two samples also present a good rate performance.…”

Turning trash into treasure: recent advances in triboelectric nanogenerator based on waste-derived carbonized materials

“…Many reactants dissolve in water; carbon-rich solid products are Fig. 5 Preparation of WDCM by high-temperature pyrolysis 48 (copyright 2020 Elsevier), 23 (copyright 2021 Elsevier), 49 (copyright 2021 American Chemical Society), 47 (copyright 2017 John Wiley and Sons).…”