Mn Single-Atom Tuning Fe-N-C Catalyst Enables Highly Efficient and Durable Oxygen Electrocatalysis and Zinc–Air Batteries

Ran, Lan; Xu, Yan; Zhu, Xinwang; Chen, Shanyong; Qiu, Xiaoqing

doi:10.1021/acsnano.3c09100

Cited by 13 publications

(1 citation statement)

References 53 publications

(88 reference statements)

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“…To overcome these challenges, especially the shuttle effect, separator retrofitting has proven to be the most cost-effective of many approaches. Among various modified materials, metal oxides stand out for their incorporation of oxygen anions (O 2– ), which are characterized by robust electronegativity capable of forming powerful chemical interactions with polysulfides. , Furthermore, metal oxide materials possess a higher oscillator density, contributing to an augmented volumetric energy density in Li–S batteries. − Zheng et al prepared high-entropy metal oxides (HEMO-1) as anchors to suppress polysulfides. The interaction between HEMO-1 and polysulfides, facilitated by the synergistic Li–O and S–Ni bonds, effectively boosted the affinity for polysulfides at the interface, while mitigating the shuttle effect.…”

Section: Introductionmentioning

confidence: 99%

Polyaniline-Coated Cobalt–Iron Oxide Composites Modified Separator for High Performance Lithium–Sulfur Batteries

Li,

Cong,

Zhao

et al. 2024

ACS Appl. Electron. Mater.

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Lithium−sulfur (Li−S) batteries have a supreme theoretical energy density, which makes them a promising candidate for energy storage. However, the persistent challenge of polysulfide dissolution hinders their extensive adoption. In this study, we developed polyaniline-coated cobalt−iron oxide composites (CFOP) to embellish separators for Li−S batteries via a straightforward calcination, followed by an in situ oxidation polymerization technique. Owing to the synergistic impact of bimetallic oxides and PANi coating, the CFOP-modified separator exhibited improved electrical conductivity and polysulfide adsorption capabilities. At 0.1 C, the sulfur cathode with CFOP modified separator showed a high discharge capacity of 1489.4 mAh•g −1 . For the electrode with high sulfur loading (>3 mg•cm −2 ), it delivered an incipient capacity of 810.9 mAh•g −1 and sustained 498.1 mAh•g −1 after long cycles (300 cycles at 0.5 C). In summary, the CFOPmodified separator successfully mitigated polysulfide shuttling, leading to enhanced electrochemical performance. This research offers valuable views into Li−S battery separator modification.

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Section: Introductionmentioning

confidence: 99%

Polyaniline-Coated Cobalt–Iron Oxide Composites Modified Separator for High Performance Lithium–Sulfur Batteries

Li,

Cong,

Zhao

et al. 2024

ACS Appl. Electron. Mater.

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Hetero‐Diatomic CoN₄‐NiN₄ Site Pairs with Long‐Range Coupling as Efficient Bifunctional Catalyst for Rechargeable Zn–Air Batteries

Yang,

Li,

Liang

et al. 2024

Advanced Science

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In this study, Co/Ni‐NC catalyst with hetero‐diatomic Co/Ni active sites dispersed on nitrogen‐doped carbon matrix is synthesized via the controlled pyrolysis of ZIF‐8 containing Co2+ and Ni2+ compounds. Experimental characterizations and theoretical calculations reveal that Co and Ni are atomically and uniformly dispersed in pairs of CoN4‐NiN4 with an intersite distance ≈0.41 nm, and there is long‐range d–d coupling between Co and Ni with more electron delocalization for higher bifunctional activity. Besides, the in situ grown carbon nanotubes at the edges of the catalyst particles allow high electronic conductivity for electrocatalysis process. Electrochemical evaluations demonstrate the superior ORR and OER bifunctionality of Co/Ni‐NC catalyst with a narrow potential gap of only 0.691 V and long‐term durability, significantly prevailing over the single‐atom Co‐NC and Ni‐NC catalysts and the benchmark Pt/C and RuO2 catalysts. Co/Ni‐NC catalyzed Zn–air batteries achieve a high specific capacity of 771 mAh g−1 and a long continuous operation period up to 340 h with a small voltage gap of ≈0.65 V, also much superior to Pt/C‐RuO2.

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Constructing Directional Electrostatic Potential Difference via Gradient Nitrogen Doping for Efficient Oxygen Reduction Reaction

Qi,

Lu,

Guo

et al. 2024

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Nitrogen doping has been recognized as an important strategy to enhance the oxygen reduction reaction (ORR) activity of carbon‐encapsulated transition metal catalysts (TM@C). However, previous reports on nitrogen doping have tended to result in a random distribution of nitrogen atoms, which leads to disordered electrostatic potential differences on the surface of carbon layers, limiting further control over the materials' electronic structure. Herein, a gradient nitrogen doping strategy to prepare nitrogen‐deficient graphene and nitrogen‐rich carbon nanotubes encapsulated cobalt nanoparticles catalysts (Co@CNTs@NG) is proposed. The unique gradient nitrogen doping leads to a gradual increase in the electrostatic potential of the carbon layer from the nitrogen‐rich region to the nitrogen‐deficient region, facilitating the directed electron transfer within these layers and ultimately optimizing the charge distribution of the material. Therefore, this strategy effectively regulates the density of state and work function of the material, further optimizing the adsorption of oxygen‐containing intermediates and enhancing ORR activity. Theoretical and experimental results show that under controlled gradient nitrogen doping, Co@CNTs@NG exhibits significantly ORR performance (Eonset = 0.96 V, E1/2 = 0.86 V). At the same time, Co@CNTs@NG also displays excellent performance as a cathode material for Zn–air batteries, with peak power density of 132.65 mA cm−2 and open‐circuit voltage (OCV) of 1.51 V. This work provides an effective gradient nitrogen doping strategy to optimize the ORR performance.

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Mn Single-Atom Tuning Fe-N-C Catalyst Enables Highly Efficient and Durable Oxygen Electrocatalysis and Zinc–Air Batteries

Cited by 13 publications

References 53 publications

Polyaniline-Coated Cobalt–Iron Oxide Composites Modified Separator for High Performance Lithium–Sulfur Batteries

Polyaniline-Coated Cobalt–Iron Oxide Composites Modified Separator for High Performance Lithium–Sulfur Batteries

Hetero‐Diatomic CoN₄‐NiN₄ Site Pairs with Long‐Range Coupling as Efficient Bifunctional Catalyst for Rechargeable Zn–Air Batteries

Constructing Directional Electrostatic Potential Difference via Gradient Nitrogen Doping for Efficient Oxygen Reduction Reaction

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Mn Single-Atom Tuning Fe-N-C Catalyst Enables Highly Efficient and Durable Oxygen Electrocatalysis and Zinc–Air Batteries

Cited by 13 publications

References 53 publications

Polyaniline-Coated Cobalt–Iron Oxide Composites Modified Separator for High Performance Lithium–Sulfur Batteries

Polyaniline-Coated Cobalt–Iron Oxide Composites Modified Separator for High Performance Lithium–Sulfur Batteries

Hetero‐Diatomic CoN4‐NiN4 Site Pairs with Long‐Range Coupling as Efficient Bifunctional Catalyst for Rechargeable Zn–Air Batteries

Constructing Directional Electrostatic Potential Difference via Gradient Nitrogen Doping for Efficient Oxygen Reduction Reaction

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Hetero‐Diatomic CoN₄‐NiN₄ Site Pairs with Long‐Range Coupling as Efficient Bifunctional Catalyst for Rechargeable Zn–Air Batteries