Sodium vanadate nanoflowers/rGO composite as a high-rate cathode material for sodium-ion batteries

VOC Bonding of Heterointerface Boosting Kinetics of Free‐Standing Na5V12O32 Cathode for Ultralong Lifespan Sodium‐Ion Batteries

“…The D Na+ values of NVO-9% rGO during the charging/discharging process are measured (i.e., ≈10 −11 to 10 −12 cm 2 s −1 ) and accordingly depicted in Figure 5f, which are higher than those in the V-based cathodes. [9,12,14] The boosted capacitive contributions and decent kinetics are assigned to the formation of V-O-C bonding with the introduction of rGO, giving rise to the superior rate capability and fast charge-transfer kinetics for the NVO-9% rGO. Moreover, to obtain insights into the electrode process kinetics of the NVO-rGO, NVO/rGO, and NVO, the diffusion coefficient of Na + in the NVO-rGO was experimentally determined to be 10 −11 cm 2 s −1 through the GITT measurements (Figure S10, Supporting Information).…”

“…Obviously, the calculation results agree well with the experimental ones, which are two orders of magnitude larger than those reported. [9,12,14] The electrochemical impedance spectroscopy (EIS) experiments at different stages (1st, 10th, and 100th cycles) were also executed to further identify the discharge and charge characteristics. It is noticed that the charge-transfer resistance in the 1st, 10th, and 100th cycles exhibit an increase compared to that before cycling.…”

“…[1][2][3][4][5][6][7][8] Among them, in numerous reports, sodium vanadium oxides have displayed satisfying capacities acting as cathode of SIBs when operated in a wider voltage window (1.5-4.0 V). [9][10][11][12][13][14][15][16] In our previous work, the sodium vanadium bronze (NaV 6 O 15 ) nanotubes of clew-like carbon-coated were designed, which could supply an exceptional capacity of 209 mAh g −1 at 25 mA g −1 . [7] Furthermore, a K + -doped sodium vanadate (Na 5-x K x V 12 O 32 ) cathode was synthesized with a reversible capacity of 169 mAh g −1 at 26 mA g −1 .…”

“…[11 ] These abovementioned vanadium-based materials still endure inferior electrical conductivity, resulting in limited cycling stability as well as inferior rate ability due to the structural collapse and capacity fading. [11][12][13][14][15][16] To tackle these concerns, some approaches have been adopted, such as constructing hierarchical structures to boost Na-ion diffusion kinetics, [9][10][11][12][13][14][15] recombining with carbon materials (e.g graphene, carbon nanotube) in order to enhance the electrical conductivity, [15][16][17] and designing unique heterostructures to alleviate interfacial strain and enhance reaction kinetics. [18] Heterostructures are a valuable approach to intensify the ion storage, which is extensively applied in various energy storage devices.…”

Design Engineering, Synthesis Protocols, and Energy Applications of MOF-Derived Electrocatalysts

“…Currently, global warming and air pollution have become two critical worldwide tasks in the twenty-first-century civilization caused by fossil fuel during production and use, which can be resolved only by using alternative environmentally friendly energy sources. Over the last decades, increasing endeavors have been devoted to energy alternative sources in particular wind energy [1,2], hydroelectric power [3][4][5][6][7][8], hydrogen energy [9][10][11], solar energy [12], and nuclear energy [13], which have already been served as complementary sources of energy to the traditional fossil fuels. One of the most promising is eco-friendly hydrogen energy and its applications for hydrogen fuel production, and hydrogen fuel cells [14][15][16].…”