Anthozoan-like porous nanocages with nano-cobalt-armed CNT multifunctional layers as a cathode material for highly stable Na–S batteries

Abstract

The capacity decay of room-temperature Na-S batteries is mainly caused by the poor electronic conductivity, shuttle effect, and volume expansion of sulfur/polysulfides (NaPSs). Herein, anthozoan-like nitrogen-doped porous carbon nanocages with...

Pore-forming mechanisms and sodium-ion-storage performances in a porous Na3V2(PO4)3/C composite cathode

“…5a) of the NVP/C-2 sample could be perfectly fitted with two peaks located at 516.7 and 523.8 eV, which were assigned to V 3+ 2p 3/2 and V 3+ 2p 1/2 , respectively. 27,28 This valence state corresponded to the standard valence state of V in NVP. The O 1s spectra could be divided into two peaks, which were assigned to P-O (531 eV)…”

Recent Advances in Transition‐Metal‐Based Catalytic Material for Room‐Temperature Sodium–Sulfur Batteries

“…Moreover, FCNT@Co 3 C-Co/S-based batteries can, even under bending conditions, light up a lamp due to its high flexible characteristics (Figure 5d). Liu et al [75] designed nitrogendoped porous carbon nanocages with a multifunctional interlayer of nano-Co-armed CNTs (Co-CNT@NPC) which on one hand defends fence-like NaPSs from entering the negative electrode area and on the other hand quickly catalyzes the conversion from soluble NaPSs to Na 2 S.…”

“…Liu et al. [ 75 ] designed nitrogen‐doped porous carbon nanocages with a multifunctional interlayer of nano‐Co‐armed CNTs (Co‐CNT@NPC) which on one hand defends fence‐like NaPSs from entering the negative electrode area and on the other hand quickly catalyzes the conversion from soluble NaPSs to Na 2 S.…”

Electrocatalysis in Room Temperature Sodium‐Sulfur Batteries: Tunable Pathway of Sulfur Speciation

“…It can be seen that besides physical confinement or chemical absorption, researchers were more enthusiastic about loading catalytic active centers into functional hosts of sulfur, which could provide numerous active sites, accelerate electron transfer, lower the reaction energy barrier, and then catalyze the fully reversible conversion of polysulfides to realize the target of the battery performance enhancement. [ 41–45 ] Here, the catalytic effect of the conversion pathways of long‐chain polysulfides, short‐chain polysulfides, and small sulfur molecules by different types of component catalytic active centers within various functional carriers was systematically summarized. Moreover, based on the analysis of the research progress, the feasibility of constructing new quasi‐solid‐state conversion sulfur electrodes by designing multi‐stage structured carriers and dual catalytic carriers and other strategies is foreseen, to achieve catalytic modulation of the sulfur reaction pathway from dissolution–deposition to quasi‐solid‐state conversion.…”