Regulation of the Electrochemical Plating/Stripping Process for Zn: Multifunctional Effects of N, S-Codoped Carbon Dots

Abstract

The aqueous zinc-ion battery is considered as one of the best alternatives to lithium-ion batteries due to its low cost and high safety. However, the inevitable dendrite growth, byproduct formation, and the side reactions have inhibited the application of aqueous zinc-ion batteries. In this work, the electronegative nitrogen and sulfur-codoped carbon dots (NSCDs) are proposed as an electrolyte additive to regulate the uniform distribution of zinc ions and inhibit the growth of dendrites. It was found that only a small amount of NSCD additive (0.2 mg mL −1 ) exerted a significant influence in electrochemical performance; the symmetrical cell can operate stably for 2000 h with a low voltage hysteresis of 33 mV at the current density of 1 mA cm −2 , and a high Coulombic efficiency (CE) of 99.5% can be obtained after 250 cycles.

Hydrophilic and nanocrystalline carbon quantum dots enable highly reversible zinc-ion batteries

“…This may be due to the fact that too few addi-tives do not contribute much to the Zn plating/stripping process, while too many additives can increase the electrolyte viscosity and decrease the ionic conductivity. 33 As shown in Fig. 2a, the cycle time of the battery with 0.2 g mL −1 CQDs is more than 1000 h, and there are no significant voltage fluctuations during cycling.…”

“…27,28 As a typical zero-dimensional carbon material, carbon quantum dots (CQDs) have been widely used in AZIBs, such as the insoluble but hydrophilic carbon dots, the hydrophilic graphene quantum dots, negatively charged nitrogen-doped and sulfonated carbon dots. [29][30][31][32][33][34] Generally, the reported carbon dots are used as protective layer adsorbed on Zn anode surface to guide uniform Zn deposition and isolate the H 2 O corrosion. However, the detrimental polarization voltage due to the poor conductivity of CQDs was neglected, which leads to sluggish kinetics.…”

Rationally Designing Closed Pore Structure by Carbon Dots to Evoke Sodium Storage Sites of Hard Carbon in Low‐Potential Region

“…Carbon dots (CDs), thanks to their ultrasmall size and abundant functional groups, had special physicochemical properties and were widely used in electrochemical energy storage applications. [21][22][23][24][25][26][27][28][29][30] The complexity of the synthesis process and the low yield of CDs had limited its development on a large scale, but our group reported an efficient and economical synthesis of kilogram-scale CDs by aldol condensation that perfectly avoided these disadvantages. [31] And concretely, the utilization of this type CDs for pore creation was undeniably innovative and valuable, owing to their diminutive size and low polymerization degree, as well as their propensity to deeply infiltrate materials during hydrothermal processes and decomposed at high temperatures, thereby interacting with the interior of carbon materials to generate closed pore structures upon incineration.…”

Unveiling the Ultrahigh-Voltage Platform of Hydrated V3O7 in Carbon Network for Enhancing Aqueous Zinc-Ion Batteries Performance

“…1 To overcome these challenges, extensive research has focused on exploring novel electrode materials that can deliver high capacity, stable performance, and extended cycling life. 2 Electrode materials, such as Prussian blue analogues, manganese-based oxides, and vanadium-based oxides, have garnered significant attention for their potential in applications involving AZIBs. Prussian blue analogues, in general, demonstrate a low specific capacity.…”

“…In spite of all these favorable factors the commercial viability of AZIBs has been hindered by their limited energy density and poor cyclability resulting from the lack of suitable cathode materials . To overcome these challenges, extensive research has focused on exploring novel electrode materials that can deliver high capacity, stable performance, and extended cycling life …”