Polycation‐Regulated Electrolyte and Interfacial Electric Fields for Stable Zinc Metal Batteries

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(27)

Published: May 8, 2023

Zn metal as one of promising anode materials for aqueous batteries but suffers from disreputable dendrite growth, grievous hydrogen evolution and corrosion. Here, a polycation additive, polydiallyl dimethylammonium chloride (PDD), is introduced to achieve long-term highly reversible plating/stripping. Specifically, the PDD can simultaneously regulate electric fields electrolyte Zn/electrolyte interface improve Zn2+ migration behaviors guide dominant (002) deposition, which veritably detected by Zeta potential, Kelvin probe force microscopy scanning electrochemical microscopy. Moreover, also creates positive charge-rich protective outer layer N-rich hybrid inner layer, accelerates desolvation during plating process blocks direct contact between water molecules anode. Thereby, reversibility stability anodes are substantially improved, certified higher average coulombic efficiency 99.7 % Zn||Cu cells 22 times longer life Zn||Zn compared with that PDD-free electrolyte.

Language: Английский

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Status and Opportunities of Zinc Ion Hybrid Capacitors: Focus on Carbon Materials, Current Collectors, and Separators

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: March 29, 2023

Abstract Zinc ion hybrid capacitors (ZIHCs), which integrate the features of high power supercapacitors and energy zinc batteries, are promising competitors in future electrochemical storage applications. Carbon-based materials deemed competitive candidates for cathodes ZIHC due to their cost-effectiveness, electronic conductivity, chemical inertness, controllable surface states, tunable pore architectures. In recent years, great research efforts have been devoted further improving density cycling stability ZIHCs. Reasonable modification optimization carbon-based offer a remedy these challenges. this review, structural design, properties cathode with different dimensions, as well selection compatible, robust current collectors separators ZIHCs discussed. The challenges prospects showcased guide innovative development novel

Language: Английский

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Co‐Intercalation of Dual Charge Carriers in Metal‐Ion‐Confining Layered Vanadium Oxide Nanobelts for Aqueous Zinc‐Ion Batteries

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 62(5)

Published: Nov. 21, 2022

Vanadium-based oxides with high theoretical specific capacities and open crystal structures are promising cathodes for aqueous zinc-ion batteries (AZIBs). In this work, the confined synthesis can insert metal ions into interlayer spacing of layered vanadium oxide nanobelts without changing original morphology. Furthermore, we obtain a series nanomaterials based on metal-confined nanobelts, describe effect electrochemical performance. The properties obtained Al2.65 V6 O13 ⋅ 2.07H2 O as AZIBs remarkably improved initial capacity 571.7 mAh g-1 at 1.0 A . Even current density 5.0 , still reach 205.7 retention 89.2 % after 2000 cycles. This study demonstrates that significantly improve energy storage applications, revealing new avenues enhancing performance AZIBs.

Language: Английский

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Manipulating Zn 002 deposition plane with zirconium ion crosslinked hydrogel electrolyte toward dendrite free Zn metal anodes

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(10), P. 4561 - 4571

Published: Jan. 1, 2023

A Zr 4+ crosslinked hydrogel electrolyte is demonstrated on side reaction resistance for high-performance aqueous Zn-based devices.

Language: Английский

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Discriminating Active BN Sites in Coralloidal B, N Dual‐Doped Carbon Nano‐Bundles for Boosted Zn‐Ion Storage Capability

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(12)

Published: Jan. 15, 2023

Abstract Dual doping of boron (B) and nitrogen (N) provides an effective strategy to tailor chemical properties electron distributions in the carbon plane, as well customize energy storage performance. Herein, a systematic theoretical experimental study on rationally constructing coralloidal B, N dual‐doped (BNC) nano‐bundles with abundant BN bonds for efficient Zn‐ion is presented. Compared single B or doped sample other sites, bond sites are found boost adsorption Zn ions enhance electronic conductivity, which efficiently contribute storage. As expected, optimized BNC display greatly improved electrochemical performance, manifested by high specific capacity 204 mAh g −1 at 0.2 A ultralong cycling stability 40 000 cycles, outperforming most state‐of‐the‐art cathodes. Moreover, distinguished density 178.7 Wh kg high‐power 17.5 kW achieved constructed BNC//Zn device. This work not only critical insight designing advanced materials but also deepens fundamental understanding governing mechanisms electrodes.

Language: Английский

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Unveiling the “Proton Lubricant” Chemistry in Aqueous Zinc‐MoS₂ Batteries

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(50)

Published: Oct. 19, 2022

Abstract Proton insertion chemistry in aqueous zinc‐ion batteries (AZIBs) is becoming a research hotspot owing to its fast kinetics and additional capacities. However, H + storage mechanism has not been deciphered the popular MoS 2 ‐based AZIBs. Herein, we innovatively prepared /poly(3,4‐ethylenedioxythiophene) (MoS /PEDOT) hybrid, where intercalated PEDOT only increases interlayer spacing (from 0.62 1.29 nm) electronic conductivity of , but also activates proton chemistry. Thus, highly efficient reversible /Zn 2+ co‐insertion/extraction behaviors are demonstrated for first time Zn‐MoS batteries. More intriguingly, co‐inserted protons can act as lubricants effectively shield electrostatic interactions between /PEDOT host divalent Zn enabling accelerated ion‐diffusion exceptional rate performance. This work proposes new concept “proton lubricant” driving transport broadens horizons

Language: Английский

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Building Sustainable Saturated Fatty Acid-Zinc Interfacial Layer toward Ultra-Stable Zinc Metal Anodes

Nano Letters, Journal Year: 2023, Volume and Issue: 23(8), P. 3573 - 3581

Published: April 12, 2023

The commercialization pace of aqueous zinc batteries (AZBs) is seriously limited due to the uncontrolled dendrite growth and severe corrosion reaction anode. Herein, a universal extendable saturated fatty acid-zinc interfacial layer strategy for modulating redox process toward ultrastable Zn metal anodes proposed. in situ complexing interphases could construct an extremely thin compound with continuously constructed zincophilic sites which kinetically regulates nucleation deposition behaviors. Furthermore, multifunctional internal hydrophobic carbon chains as protective efficient exclude active water molecules from surface efficiently inhibit zinc. Consequently, modified anode shows long cycle life over 4000 h at 5 mA cm–2. In addition, assembled Zn||V2O5 full cells based on have excellent rate performance stability.

Language: Английский

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Fenton Reaction Doubled Biomass Carbon Activation Efficiency for High‐Performance Supercapacitors

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: April 11, 2024

Abstract The huge consumption of alkali during biomass‐derived porous carbon production leads to pollution and high carbon‐emission. This study employs the concept Fenton chemistry achieve hierarchical biomass materials with a remarkably specific surface area 3440 m 2 g −1 double activation efficiency compared traditional process. optimized electrode demonstrates exceptional capacitance 425.2 F at current density 0.1 A great rate performance (286.1 100 ) in 6 KOH electrolyte. enabled supercapacitor remarkable cycling stability, retaining up 99.74% its initial after undergoing 20 000 charge–discharge cycles. In addition, electrolyte ion distribution different pore structures is simulated using Molecular Dynamics, which confirms that structure conducive rapid diffusion ions, thus matching excellent electrochemical properties. assembled symmetric supercapacitors maximum energy 42.1 Wh kg (12.1 based on cell stack mass) TEABF 4 /AN work presents an effective technique for formation from precursors. novel methodology can be applied many other similar systems storage beyond.

Language: Английский

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Gradient Pores Enhance Charge Storage Density of Carbonaceous Cathodes for Zn‐Ion Capacitor

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(23)

Published: Feb. 13, 2024

Abstract Engineering carbonaceous cathode materials with adequately accessible active sites is crucial for unleashing their charge storage potential. Herein, activated meso‐microporous shell carbon (MMSC‐A) nanofibers are constructed to enhance the zinc ion density by forming a gradient‐pore structure. A dominating pore size of 0.86 nm tailored cater solvated [Zn(H 2 O) 6 ] 2+ . Moreover, these gradient porous feature rapid ion/electron dual conduction pathways and offer abundant surfaces high affinity electrolyte. When employed in Zn‐ion capacitors (ZICs), electrode delivers significantly enhanced capacity (257 mAh g −1 ), energy (200 Wh kg at 78 W cyclic stability (95% retention after 10 000 cycles) compared nonactivated electrode. series situ characterization techniques unveil that improved Zn capability stems from compatibility between pores , co‐adsorption H + SO 4 2− as well reversible surface chemical interaction. This work presents an effective method engineering toward energy‐density storage, also offers insights into mechanism such structures.

Language: Английский

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Phosphorus‐Mediated Local Charge Distribution of N‐Configuration Adsorption Sites with Enhanced Zincophilicity and Hydrophilicity for High‐Energy‐Density Zn‐Ion Hybrid Supercapacitors

Small, Journal Year: 2023, Volume and Issue: 19(45)

Published: July 10, 2023

Tailor-made carbonaceous-based cathodes with zincophilicity and hydrophilicity are highly desirable for Zn-ion storage applications, but it remains a great challenge to achieve both advantages in the synthesis. In this work, template electrospinning strategy is developed synthesize nitrogen phosphorous co-doped hollow porous carbon nanofibers (N, P-HPCNFs), which deliver high capacity of 230.7 mAh g-1 at 0.2 A , superior rate capability 131.0 20 maximum energy density 196.10 Wh kg-1 power 155.53 W . Density functional theory calculations (DFT) reveal that introduced P dopants regulate distribution local charge materials therefore facilitate adsorption Zn ions due increased electronegativity pyridinic-N. Ab initio molecular dynamics (AIMD) simulations indicate doped species induce series polar sites create hydrophilic microenvironment, decreases impedance between electrode electrolyte accelerates reaction kinetics. The marriage ex situ/in situ experimental analyses theoretical uncovers origin enhanced N, P-HPCNFs storage, accounts faster ion migration electrochemical processes.

Language: Английский

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