Hierarchical 3D porous carbon with facilely accessible Fe–N<sub>4</sub> single-atom sites for Zn–air batteries

Li, Pingbo; Qi, Xueqiang; Zhao, Lei; Wang, Junjie; Wang, Meng; Shao, Minhua; Chen, Jun Song; Wu, Rui; Wei, Zidong

doi:10.1039/d1ta08050d

Cited by 48 publications

(28 citation statements)

References 44 publications

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“…The specific capacity, tested at 10 mA cm –2 , reaches 731 mAh g Zn –1 for Z‐CNF‐3‐15 CL, indicating the utilization is 89.1% (since the theoretical capacity is 820 mAh g Zn –1 ). [ 28 ] When cycled at the current density of 5 mA cm –2 , the voltage gap gradually increases from 0.724 V (first cycle) to 0.991 V after 10 h. Then, the voltage gap is maintained at around 1 V, suggesting good durability.…”

Section: Resultsmentioning

confidence: 99%

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Fast Current‐Driven Synthesis of ZIF‐Derived Catalyst Layers for High‐Performance Zn‐Air Battery

Zhu

Liu

Yue

et al. 2022

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As a core component, the catalyst layer (CL) is widely used in fuel cell, metal‐air battery, and other energy conversion devices. Herein, a highly efficient method for CL preparation via fast current‐driven synthesis followed by pyrolysis is proposed. Compared with previously reported fabrication procedures of zeolite imidazolate frameworks (ZIF)‐based CLs, this method directly deposits the ZIF precursor onto the conductive substrate in a very short time (≤15 min). The self‐supporting CL, converted from ZIF membrane by simple single‐step pyrolysis, is assembled with the gas diffusion layer to obtain cathode. Electrochemical tests exhibit a small potential gap (0.83 V) between the oxygen reduction and evolution reactions, as well as high performance and excellent stability for Zn‐air battery (241 mW cm–2 at 390 mA cm–2), due to the unique design of a bi‐continuous framework (interconnected pores and long carbon nanotubes) and Co‐based active sites. This work may provide new directions for the fast fabrication of non‐platinum group metal CLs for metal‐air batteries or fuel cell applications.

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Section: Resultsmentioning

confidence: 99%

“…). [28] When cycled at the current density of 5 mA cm -2 , the voltage gap gradually increases from 0.724 V (first cycle) to 0.991 V after 10 h. Then, the voltage gap is maintained at around 1 V, suggesting good durability.…”

Section: The Optimization Of Substratesmentioning

confidence: 93%

Fast Current‐Driven Synthesis of ZIF‐Derived Catalyst Layers for High‐Performance Zn‐Air Battery

Zhu

Liu

Yue

et al. 2022

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“…The material exhibits 3D hierarchical structure, and the exposed active sites are largely increased, including rich N functional groups, oxygen vacancies and carbon defects, resulting in improved bi-functional electrocatalytic performance. Qi and co-workers [111] reported 3D interconnected porous nitrogen-doped carbon network by pyrolyzing SiO 2 @ZIF-8 composites filled with iron salts. Such material features single-atom-Fe dispersion on the highly porous carbon support, which exhibited excellent oxygeninvolved electrocatalytic performance.…”

Section: D Electrodes For the Bi-functional Oxygen Electrocatalysismentioning

confidence: 99%

Three‐Dimensional Electrodes for Oxygen Electrocatalysis

Xuan

et al. 2022

ChemElectroChem

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in oxygen reduction/evolution reactions, mainly including the 3D electrode design, the electrocatalysis in oxygen reduction, oxygen evolution and the bi-functional activity of the two reactions. Besides, metal-air batteries facilitated with 3D electrodes are also fully discussed, including the mechanisms based on the aqueous and organic electrolytes. At the end, the existing challenges and perspectives of 3D electrodes are proposed for further development of the metal-air batteries and auxiliary generative ideas for the renewable energy development.

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“…Among the devices, zinc−air batteries (ZABs) are recognized as a promising candidate because of their low-cost, high safety, environmental friendliness, high theoretical energy density (1086 Wh kg −1 ), and high power density [8,9]. However, the oxygen reduction reaction (ORR) on the cathode acts as one key chemical reaction in the ZABs, which is subject to sluggish kinetics and high overpotential [10,11]. Thus, the highly efficient and stable catalysts were required to reduce overpotential and accelerate the ORR rate throughout the service time.…”

Section: Introductionmentioning

confidence: 99%

2D Zinc-Based Metal–Organic Complexes Derived N-Doped Porous Carbon Nanosheets as Durable Air Cathode for Rechargeable Zn–Air Batteries

et al. 2022

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The defect and N-doping engineering are critical to developing the highly efficient metal-free electrocatalysts for oxygen reduction reaction (ORR), mainly because they can efficiently regulate the geometric/electronic structures and sur-/interface properties of the carbon matrix. Herein, we provide a facile and scalable strategy for the large-scale synthesis of N-doped porous carbon nanosheets (NPCNs) with hierarchical pore structure, only involving solvothermal and pyrolysis processes. Additionally, the turnover frequency of ORR (TOFORR) was calculated by taking into account the electron-transfer number (n). Benefiting from the trimodal pore structures, high specific surface area, a higher pore volume, high-ratio mesopores, massive vacancies/long-range structural defects, and high-content pyridinic-N (~2.1%), the NPCNs-1000 shows an excellent ORR activity (1600 rpm, js = ~5.99 mA cm−2), a selectivity to four-electron ORR (~100%) and a superior stability in both the three-electrode tests (CP test for 7500 s at 0.8 V, Δjs = ~0.58 mA cm−2) and Zn–Air battery (a negligible loss of 0.08 V within 265 h). Besides, the experimental results indicate that the enhancement of ORR activity mainly originates from the defects and pyridinic-N. More significantly, this work is expected to realize green and efficient energy storage and conversion along with the carbon peaking and carbon neutrality goals.

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Hierarchical 3D porous carbon with facilely accessible Fe–N₄ single-atom sites for Zn–air batteries

Abstract: Here, we report a highly efficient ORR electrocatalyst with Fe-N4 active sites uniformly dispersed on a three-dimensional (3D) interconnected porous nitrogen-doped carbon network by pyrolyzing SiO2@ZIF-8 composites loaded with iron...

Cited by 48 publications

References 44 publications

Fast Current‐Driven Synthesis of ZIF‐Derived Catalyst Layers for High‐Performance Zn‐Air Battery

Fast Current‐Driven Synthesis of ZIF‐Derived Catalyst Layers for High‐Performance Zn‐Air Battery

Three‐Dimensional Electrodes for Oxygen Electrocatalysis

2D Zinc-Based Metal–Organic Complexes Derived N-Doped Porous Carbon Nanosheets as Durable Air Cathode for Rechargeable Zn–Air Batteries

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Hierarchical 3D porous carbon with facilely accessible Fe–N4 single-atom sites for Zn–air batteries

Abstract: Here, we report a highly efficient ORR electrocatalyst with Fe-N4 active sites uniformly dispersed on a three-dimensional (3D) interconnected porous nitrogen-doped carbon network by pyrolyzing SiO2@ZIF-8 composites loaded with iron...

Cited by 48 publications

References 44 publications

Fast Current‐Driven Synthesis of ZIF‐Derived Catalyst Layers for High‐Performance Zn‐Air Battery

Fast Current‐Driven Synthesis of ZIF‐Derived Catalyst Layers for High‐Performance Zn‐Air Battery

Three‐Dimensional Electrodes for Oxygen Electrocatalysis

2D Zinc-Based Metal–Organic Complexes Derived N-Doped Porous Carbon Nanosheets as Durable Air Cathode for Rechargeable Zn–Air Batteries

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Hierarchical 3D porous carbon with facilely accessible Fe–N₄ single-atom sites for Zn–air batteries