Controlled synthesis of FeNx-CoNx dual active sites interfaced with metallic Co nanoparticles as bifunctional oxygen electrocatalysts for rechargeable Zn-air batteries

Wu, Yijin; Wu, Xiaoqing; Tu, Teng-xiu; Zhang, Pengfang; Li, Jun‐Tao; Zhou, Yao; Huang, Ling; Sun, Shi‐Gang

doi:10.1016/j.apcatb.2020.119259

Cited by 116 publications

(35 citation statements)

References 50 publications

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“…[36,37] The Fourier-transformed extended X-ray absorption fine structure (FT-EXAFS) of Fe-ACSA@NC (Figure 2g) exhibits peaks at both � 1.5 Å and 2.1 Å, corresponding to the FeÀ N and FeÀ Fe bonds, respectively. [38,39] This result supports the coexistence of Fe clusters and atomic dispersed FeÀ N sites. It is noteworthy that Fe-NPSA@NC also shows the peak at � 1.5 Å with a slightly lower intensity than that of Fe-ACSA@NC.…”

Section: Atomic Structure Analysissupporting

confidence: 62%

Clusters Induced Electron Redistribution to Tune Oxygen Reduction Activity of Transition Metal Single‐Atom for Metal–Air Batteries

et al. 2022

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Oxygen reduction reaction (ORR) activity can be effectively tuned by modulating the electron configuration and optimizing the chemical bonds. Herein, a general strategy to optimize the activity of metal single‐atoms is achieved by the decoration of metal clusters via a coating–pyrolysis–etching route. In this unique structure, the metal clusters are able to induce electron redistribution and modulate M−N species bond lengths. As a result, M‐ACSA@NC exhibits superior ORR activity compared with the nanoparticle‐decorated counterparts. The performance enhancement is attributed to the optimized intermediates desorption benefiting from the unique electronic configuration. Theoretical analysis reinforces the significant roles of metal clusters by correlating the ORR activity with cluster‐induced charge transfer. As a proof‐of‐concept, various metal–air batteries assembled with Fe‐ACSA@NC deliver remarkable power densities and capacities. This strategy is an effective and universal technique for electron modulation of M−N−C, which shows great potential in application of energy storage devices.

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Section: Atomic Structure Analysissupporting

confidence: 62%

Clusters Induced Electron Redistribution to Tune Oxygen Reduction Activity of Transition Metal Single‐Atom for Metal–Air Batteries

et al. 2022

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“…(1) The rational coupling of Co and MoC phases into one advanced structure can accelerate the interfacial charge-transfer between adjacent domains, thus significantly reducing the adsorption free energy of the intermediate and enhancing the trifunctional electrochemical performance in terms of excellent activity and high long-term durability for OER, ORR, and HER . (2) Favorable hollow structure features give the Co@IC/MoC@PC catalyst a higher electrochemical active area, thus facilitating the involved electrocatalytic reactions. − (3) The N-doped carbon matrix can effectively protect its inner core of Co/MoC from corrosion and poisoning of the electrolyte, thereby delaying or preventing the deactivation of the catalyst. , (4) The carbon matrix possesses the characteristics of nitrogen doping and high graphitization, which can increase the conductivity of the catalyst, thus leading to fast charge transports during the electrocatalytic reactions. − …”

Section: Resultsmentioning

confidence: 99%

Co/MoC Nanoparticles Embedded in Carbon Nanoboxes as Robust Trifunctional Electrocatalysts for a Zn–Air Battery and Water Electrocatalysis

et al. 2021

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To meet the application needs of rechargeable Zn−air battery and electrocatalytic overall water splitting (EOWS), developing high-efficiency, cost-effective, and durable trifunctional catalysts for the hydrogen evolution reaction (HER), oxygen evolution, and reduction reaction (OER and ORR) is extremely paramount yet challenging. Herein, the interface engineering concept and nanoscale hollowing design were proposed to fabricate N-doping carbon nanoboxes confined with Co/MoC nanoparticles. Uniform zeolitic imidazolate framework nanocube was employed as the starting material to construct the trifunctional electrocatalyst through the conformal polydopamine−Mo layer coating and the subsequent pyrolysis treatment. The Co@IC/MoC@PC catalyst displayed superior electrochemical ORR performances with a positive half-wave potential of 0.875 V and a high limiting current density of 5.89 mA/cm 2 . When practically employed as an electrocatalyst in regenerative Zn−air battery, a high specific capacity of 728 mAh/g, a large peak power density of 221 mW/cm 2 , a high open-circuit voltage of 1.482 V, and a low charge/discharge voltage gap of 0.41 V were obtained. Moreover, its practicability was further exploited by overall water splitting, affording low overpotentials of 277 and 68 mV at 10 mA/cm 2 for the OER and HER in 1 M KOH solution, respectively, and a decent operating potential of 1.57 V for EOWS. Ultraviolet photoelectron spectroscopy and density functional theory calculation revealed that the Co/MoC interface synergistically facilitated the charge-transfer, thereby contributing to the enhancements of electrocatalytic ORR/OER/HER processes. More importantly, this catalyst design concept can offer some interesting prospects for the construction of outstanding trifunctional catalysts toward various energy conversion and storage devices.

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“…In the XRD patterns (Figure a), the broad peak at 26.4° belongs to the (002) planes of carbon . Another two peaks at around 44.6 and 65° can be assigned to the (110) and (200) facets of α-Fe (PDF #06-0696).…”

Section: Results and Discussionmentioning

confidence: 99%

Fe/Fe₃C-NC Nanosheet/Carbon Nanotube Composite Electrocatalysts for Oxygen Reduction Reaction

Huang

et al. 2020

ACS Appl. Nano Mater.

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The construction of active and durable electrocatalysts based on a high abundance of elements toward oxygen reduction reaction (ORR) is critical for proton-exchange membrane fuel cells and metal–air batteries. Here, a composite nanostructure composed of Fe/Fe3C-NC nanosheets and carbon nanotubes (G-Fe/Fe3C-NC/CNTs) was designed by simply annealing a glucose-chelated Fe-coordinated metal–organic frameworks. The introduction of glucose can not only effectively prevent the collapse of the initial two-dimensional (2D) leaflike zeolitic imidazolate frameworks (ZIFs) during the carbonization process but also boost the growth of carbon nanotubes (CNTs). Benefiting from efficient Fe/Fe3C and Fe–N x moieties, high specific surface area, and electron-conducting highways provided by the unique composite structure, the obtained G-Fe/Fe3C-NC/CNTs electrocatalysts achieved an impressive ORR activity with a higher positive onset potential of 1.02 V and half-wave potential of 0.87 V over the commercial Pt/C. Significantly, it also exhibits outstanding stability after 6000 cyclic voltammogram (CV) cycles with nearly negligible decay in half-wave potential, which makes it one of the promising Pt-free catalysts for ORR.

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Controlled synthesis of FeNx-CoNx dual active sites interfaced with metallic Co nanoparticles as bifunctional oxygen electrocatalysts for rechargeable Zn-air batteries

Cited by 116 publications

References 50 publications

Clusters Induced Electron Redistribution to Tune Oxygen Reduction Activity of Transition Metal Single‐Atom for Metal–Air Batteries

Clusters Induced Electron Redistribution to Tune Oxygen Reduction Activity of Transition Metal Single‐Atom for Metal–Air Batteries

Co/MoC Nanoparticles Embedded in Carbon Nanoboxes as Robust Trifunctional Electrocatalysts for a Zn–Air Battery and Water Electrocatalysis

Fe/Fe₃C-NC Nanosheet/Carbon Nanotube Composite Electrocatalysts for Oxygen Reduction Reaction

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Controlled synthesis of FeNx-CoNx dual active sites interfaced with metallic Co nanoparticles as bifunctional oxygen electrocatalysts for rechargeable Zn-air batteries

Cited by 116 publications

References 50 publications

Clusters Induced Electron Redistribution to Tune Oxygen Reduction Activity of Transition Metal Single‐Atom for Metal–Air Batteries

Clusters Induced Electron Redistribution to Tune Oxygen Reduction Activity of Transition Metal Single‐Atom for Metal–Air Batteries

Co/MoC Nanoparticles Embedded in Carbon Nanoboxes as Robust Trifunctional Electrocatalysts for a Zn–Air Battery and Water Electrocatalysis

Fe/Fe3C-NC Nanosheet/Carbon Nanotube Composite Electrocatalysts for Oxygen Reduction Reaction

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Fe/Fe₃C-NC Nanosheet/Carbon Nanotube Composite Electrocatalysts for Oxygen Reduction Reaction