A Multifunctional Artificial Interphase with Fluorine‐Doped Amorphous Carbon layer for Ultra‐Stable Zn Anode

Abstract

Building an artificial interphase layer for tackling uncontrollable Zn dendrites and serious side reactions is a highly desirable strategy, but it is often hampered by the limited Zn 2+ transport. Here, a stable fluorine-doped amorphous carbon (CF) artificial layer is constructed on a Cu current collector (CF-Cu) via facile carbonization treatment of a fluoropolymer coating to realize underlying Zn deposition. As evidenced experimentally and theoretically, this inorganic CF layer with ionic conductivity and electronic insulation successfully triggers dendrite-free Zn deposition at the CF-Cu interface with preferred Zn(002) crystal plane stacking parallel to the substrate surface, thus greatly promoting the inhibition of Zn-dendrites and blocking of interfacial side reactions. The introduced fluorine atoms as abundant zincophilic sites play an important role in driving fast zinc-ion transfer kinetics, which can partly convert into ZnF 2 as an artificial solid Zn 2+ conductor to further guide uniform Zn deposition. Consequently, the CF-Cu electrode enables high reversibility with 99% coulombic efficiency and a long cycling stability of 1900 cycles at 2 mA cm -2 . The integrated CF-Cu@Zn anode achieves up to 2200 h cycles with a low voltage polarization. This study provides inspiration for the design of artificial interphase layers for stable nondendritic metal batteries.

Electrolyte Regulation of Bio‐Inspired Zincophilic Additive toward High‐Performance Dendrite‐Free Aqueous Zinc‐Ion Batteries

“…[4][5][6] As previously reported, the dominant factors limiting the performance of Zn anode are due to the notorious zinc growth and parasitic side reactions (e.g., electrode corrosion, H 2 evolution, and passivation). [7,8] To overcome these obstacles, various endeavors have been exerted to stabilize the Zn anode, such as optimizing the geometric structure for Zn anode, [9,10] constructing the artificial solid electrolyte interface functional layer, [6,11,12] and tuning the electrolyte formulation. [13][14][15] Owing to the simple operation procedure and low-cost production, incorporating electrolyte additive is regarded as an efficacious method to stabilize the Zn anode in recent years.…”

A UiO-66-NH2 MOF derived N doped porous carbon and ZrO2 composite cathode for zinc-ion hybrid supercapacitors

“…2b show the characteristic D band (1354 cm −1 ) and G band (1588 cm −1 ) for both the NC@ZrO 2 and C@ZrO 2 composites, which is related to the lattice defect for defective/distorted carbon and the in-plane stretching vibration of sp 2 hybridization for graphitic carbon, respectively. 5,14,16,27,28 The degree of graphitic disorder and the defect concentration can be quantitatively evaluated by the peak area ratio of the D band to the G band ( i.e. , I D / I G ).…”

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

“…Most notably, the cathodic corrosion current density of NSCDs/ZnSO 4 is always lower than that of ZnSO 4 solution over the entire potential range; this result is consistent with Tafel's test result. 37 Compared with bare ZnSO 4 electrolyte, the Zn corrosion potential in NSCDs/ ZnSO 4 electrolyte shows a lower overpotential(ZnSO 4 / NSCDs/−1.95 V & −1.86 V/Bare ZnSO 4 ), which further proved that the corrosion resistance of the Zn anode increases, and the water-induced side reaction was effectively alleviated owing to the protective effect of the NSCDs/ZnSO 4 electrolyte.…”

“…To unveil the suppression of side reactions, the effect of NSCD additive on hydrogen evolution reaction (HER) inhibition was analyzed by linear sweep voltammetry (LSV) based on a three-electrode system in 1 M NaSO 4 aqueous solution with the scanning speed of 5 mV s –1 . Most notably, the cathodic corrosion current density of NSCDs/ZnSO 4 is always lower than that of ZnSO 4 solution over the entire potential range; this result is consistent with Tafel’s test result . Compared with bare ZnSO 4 electrolyte, the Zn corrosion potential in NSCDs/ZnSO 4 electrolyte shows a lower overpotential­(ZnSO 4 /NSCDs/–1.95 V & −1.86 V/Bare ZnSO 4 ), which further proved that the corrosion resistance of the Zn anode increases, and the water-induced side reaction was effectively alleviated owing to the protective effect of the NSCDs/ZnSO 4 electrolyte.…”