Flexible Zinc–Air Batteries with Ampere‐Hour Capacities and Wide‐Temperature Adaptabilities

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(13)

Published: Jan. 30, 2023

Flexible Zn-air batteries (FZABs) have significant potentials as efficient energy storage devices for wearable electronics because of their safeties and high energy-to-cost ratios. However, application is limited by short cycle lives, low discharge capacities per cycle, charge/discharge polarizations. Accordingly, herein, a poly(sodium acrylate)-polyvinyl alcohol (PANa-PVA)-ionic liquid (IL) hydrogel (PANa-PVA-IL) prepared using hygroscopic IL, 1-ethyl-3-methylimidazolium chloride, an additive twin-chain PANa-PVA. PANa-PVA-IL exhibits conductivity 306.9 mS cm-1 water uptake 2515 wt% at room temperature. Moreover, low-cost bifunctional catalyst, namely, Co9 S8 nanoparticles anchored on N- S-co-doped activated carbon black pearls 2000 (Co9 -NSABP), synthesized, which demonstrates O2 reversibility potential gap 0.629 V. FZABs based -NSABP demonstrate 1.67 mAh cm-2 long lives 330 h. Large-scale flexible rechargeable pouch cells exhibit total 1.03 Ah densities 246 Wh kgcell-1 . This study provides new information about hydrogels with ionic conductivities uptakes should facilitate the in electronics.

Language: Английский

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Lignin-derived iron carbide/Mn, N, S-codoped carbon nanotubes as a high-efficiency catalyst for synergistically enhanced oxygen reduction reaction and rechargeable zinc-air battery

Journal of Colloid and Interface Science, Journal Year: 2023, Volume and Issue: 647, P. 1 - 11

Published: May 21, 2023

Language: Английский

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Dianion Induced Electron Delocalization of Trifunctional Electrocatalysts for Rechargeable Zn–Air Batteries and Self‐Powered Water Splitting

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(29)

Published: April 22, 2022

Abstract The development of low‐cost multifunctional electrocatalysts with high activity for the hydrogen evolution reaction (HER), oxygen (OER), and reduction (ORR) is critical advancement sophisticated energy conversion storage devices. Herein, a trifunctional Ni(S 0.51 Se 0.49 ) 2 @NC catalyst designed fabricated using dianionic regulation strategy. Synchrotron radiation X‐ray absorption spectroscopy density functional theory calculations reveal that simultaneous sulfidation selenization can induce electronic delocalization active sites to enhance adsorption *OOH/*OH intermediate ORR/OER H* HER. OER HER mechanisms are revealed by in situ Raman spectroscopy. exhibits catalytic (111 mV at 10 mA cm −2 ), (320 ORR (half‐wave potential 0.83 V). rechargeable zinc–air batteries (ZABs) exhibit an open‐circuit voltage 1.46 V, specific capacity 799.1 mAh g −1 , excellent stability 1000 cycles. water electrolytic cell electrodes delivers current 1.59 it be powered constructed ZABs. These findings contribute developing efficient non‐noble metal catalysts.

Language: Английский

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Carbon-Based Electrodes for Advanced Zinc-Air Batteries: Oxygen-Catalytic Site Regulation and Nanostructure Design

Electrochemical Energy Reviews, Journal Year: 2023, Volume and Issue: 6(1)

Published: March 23, 2023

Abstract Zn-air batteries are highly attractive for direct chemical-to-electrical energy conversion and solving the crisis environmental problems. Designing efficient oxygen electrodes has been considered one of most critical steps in development advanced because sluggish kinetics reduction reaction evolution reaction. In recent years, nanostructured carbon-based with large surface areas, oxygen-catalytic centers, hierarchically porous matrices have provided significant opportunities to optimize performance both primary rechargeable batteries. this review, we provide a comprehensive summary reported terms tailoring sites designing carbon supports. The versatile synthetic strategies, characterization methods, in-depth understanding relationships between sites/nanostructures electrode systematically summarized. Furthermore, also briefly outline progress engineering flexible high-power Ultimately, thorough discussion current challenges future perspectives on rational design is given, thus providing inspiration prosperity fast-kinetic broad range fields. Graphical

Language: Английский

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Hetero‐Anionic Structure Activated CoS Bonds Promote Oxygen Electrocatalytic Activity for High‐Efficiency Zinc–Air Batteries

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(36)

Published: May 18, 2023

Abstract The electronic structure of transition metal complexes can be modulated by replacing partial ion to obtain tuned intrinsic oxygen reduction reaction (ORR) or evolution (OER) electrocatalytic activity. However, the anion‐modulated ORR activity is still unsatisfactory, and construction hetero‐anionic remains challenging. Herein, an atomic doping strategy presented prepare CuCo 2 O 4‐x S x /NC‐2 (CCSO/NC‐2) as electrocatalysts, structrual characterization results favorably demonstrate substitution atoms for in CCSO/NC‐2, which shows excellent catalytic performance durability OER 0.1 m KOH. In addition, catalyst assembled Zinc–air battery with open circuit potential 1.43 V maintains after 300 h cyclic stability. Theoretical calculations differential charges illustrate that optimizes kinetics promotes electron redistribution. superior CCSO/NC‐2 catalysis mainly due its unique modulation main body. introduction CoO covalency constructs a fast transport channel, thus optimizing adsorption degree active site Co intermediates.

Language: Английский

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Bifunctional electrocatalyst with CoN3 active sties dispersed on N-doped graphitic carbon nanosheets for ultrastable Zn-air batteries

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 316, P. 121674 - 121674

Published: June 27, 2022

Language: Английский

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Core–Shell Carbon‐Based Bifunctional Electrocatalysts Derived from COF@MOF Hybrid for Advanced Rechargeable Zn–Air Batteries

Small, Journal Year: 2022, Volume and Issue: 18(31)

Published: July 9, 2022

The development of highly active carbon-based bifunctional electrocatalysts for both the oxygen evolution reaction (OER) and reduction (ORR) is desired, but still full challenges in rechargeable Zn-air batteries. Metal organic frameworks (MOFs) covalent (COFs) have gained great attention various applications due to their attractive features structural tunability, high surface area porosity. Herein, a core-shell structured hybrid electrocatalyst (H-NSC@Co/NSC), which contains density sites MOF-derived shell (Co/NSC) COF-derived hollow core (H-NSC), successfully fabricated by direct pyrolysis covalently-connected COF@ZIF-67 hybrid. H-NSC@Co/NSC manifests excellent catalytic properties toward OER ORR with small potential gap (∆E = 0.75 V). assembled battery exhibits power-density 204.3 mW cm-2 stable rechargeability, outperforming that Pt/C+RuO2 battery. Density functional theory calculations reveal electronic structure carbon on Co/NSC can be effectively modulated embedded Co nanoparticles (NPs), facilitating adsorption intermediates leading enhanced activity. This work will provide strategy design highly-efficient application energy conversion storage.

Language: Английский

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Recent progress of transition metal-based bifunctional electrocatalysts for rechargeable zinc–air battery application

Current Opinion in Electrochemistry, Journal Year: 2023, Volume and Issue: 38, P. 101229 - 101229

Published: Feb. 4, 2023

Language: Английский

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Aerophilic Triphase Interface Tuned by Carbon Dots Driving Durable and Flexible Rechargeable Zn-Air Batteries

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

Published: Jan. 3, 2023

Efficient bifunctional catalysts for oxygen reduction reaction (ORR) and evolution (OER) are vital rechargeable Zn-air batteries (ZABs). Herein, an oxygen-respirable sponge-like Co@C-O-Cs catalyst with oxygen-rich active sites was designed constructed both ORR OER by a facile carbon dot-assisted strategy. The aerophilic triphase interface of cathode efficiently boosts diffusion transfer. theoretical calculations experimental studies revealed that the Co-C-COC can redistribute local charge density lower energy barrier. displays superior catalytic activities half-wave potential 0.82 V ultralow overpotential 294 mV at 10 mA cm-2 OER. Moreover, it drive liquid ZABs high peak power (106.4 mW cm-2), specific capacity (720.7 mAh g-1), outstanding long-term cycle stability (over 750 cycles exhibits excellent feasibility in flexible all-solid-state ZABs. These findings provide new insights into rational design efficient metal-air batteries.

Language: Английский

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Sulfur Mismatch Substitution in Layered Double Hydroxides as Efficient Oxygen Electrocatalysts for Flexible Zinc–Air Batteries

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(11)

Published: Jan. 1, 2023

Abstract Although layered double hydroxides (LDHs) are extensively investigated for oxygen electrocatalysis, their development is hampered by limited active sites and sluggish reaction kinetics. Here, sulfur mismatch substitution of NiFe–LDH (S–LDH) demonstrated, which in‐situ deposited on nitrogen‐doped graphene (S–LDH/NG). This atomic‐level incorporation leads to the construction tailored topological microstructure modulated electronic structure improved catalytic activity durability bifunctional electrocatalysts. The combined computational experimental results clarify that electron transfer between anion Fe 3+ generates high‐valence 4+ species, while induces metallic conductivity, an increased carrier density, reduced barrier. Consequently, as‐fabricated Zn–air battery achieves a high power density 165 mW cm ‐2 , large energy 772 Wh kg Zn ‐1 at 5 mA long cycle stability 120 h, demonstrating its real‐life operation.

Language: Английский

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