N- &amp; S-co-doped carbon nanofiber network embedded with ultrafine NiCo nanoalloy for efficient oxygen electrocatalysis and Zn–air batteries

Liu, Chaojun; Wang, Zhuang; Zong, Xin; Jin, Yingmin; Dong, Li Min; Xiong, Yueping; Wu, Gang

doi:10.1039/d0nr01516d

Cited by 37 publications

(18 citation statements)

References 52 publications

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“…As observed, all of the resultant materials exhibited typical type‐IV isotherm hysteresis, revealing the mesoporous characters (Figure 2E). Meanwhile, the existence of microporous and macroporous structures was also confirmed according to large adsorption value within the range of P/P 0 from 0 to 0.05 and a significant increase within the range of P/P 0 from 0.9 to 1.0 [48] . Moreover, the specific surface area of the resultant HPNC‐2 was calculated to be 1263.6 m 2 g −1 , which is significantly larger than those of the resultant HPNC‐1 (764.3 m 2 g −1 ) and the resultant HPNC (731.3 m 2 g −1 ).…”

Section: Resultsmentioning

confidence: 76%

“…Meanwhile, the existence of microporous and macroporous structures was also confirmed according to large adsorption value within the range of P/P 0 from 0 to 0.05 and a significant increase within the range of P/P 0 from 0.9 to 1.0. [48] Moreover, the specific surface area of the resultant HPNC-2 was calculated to be 1263.6 m 2 g À 1 , which is significantly larger than those of the resultant HPNC-1 (764.3 m 2 g À 1 ) and the resultant HPNC (731.3 m 2 g À 1 ). Besides, the pore distribution curves have been calculated using density-functional-theory (DFT) method, as showed in Figure 2F.…”

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confidence: 91%

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Ion‐Induced Formation of Hierarchical Porous Nitrogen‐Doped Carbon Materials with Enhanced Oxygen Reduction

Liu

et al. 2021

ChemCatChem

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Nanostructured nitrogen-doped carbon materials are considered as an appealing material to replace precious-metal Ptbased catalysts in fuel cells due to a high oxygen reduction reaction (ORR) activity and outstanding stability. In the present work, we developed an ion-induced method for the fabrication of hierarchical porous nitrogen-doped carbon materials (HPNC) using Cd-organic complexes as sacrificial templates and precursors. During pyrolysis, a hierarchical porous structure with a high specific surface area was formed through the combination of a metal-free ion as structure-directing agent and the evaporation property of Cd. Benefiting from this unique structure, the resulting HPNC exhibited comparable ORR performance with commercial Pt/C, including positive onset potential of 0.96 V vs. RHE (reversible hydrogen electrode), positive half-wave potential of 0.86 V vs. RHE, good methanol tolerance and stability. On this basis, the assembled Zn-air battery showed high open circuit potential, power density and excellent stability.

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Section: Resultsmentioning

confidence: 76%

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confidence: 91%

Ion‐Induced Formation of Hierarchical Porous Nitrogen‐Doped Carbon Materials with Enhanced Oxygen Reduction

Liu

et al. 2021

ChemCatChem

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“…This catalyst displays the OER with the overpotential of 268 mV at 10 mA cm −2 and 0.806 V of ORR half‐wave potential. [ 94 ] In this work, thioacetamide (TAA) can chelate with Co and Ni ions, which effectively prevents the aggregation of metal atoms during the carbonization process and S doping is obtained at the same time.…”

Section: Orr Performance Enhancement Of Electrospinning Cnfsmentioning

confidence: 99%

Recent Advances in Enhancing Oxygen Reduction Reaction Performance for Non‐Noble‐Metal Electrocatalysts Derived from Electrospinning

Xie

Tang

et al. 2021

Energy Tech

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Carbonaceous materials originated from electrospinning fibers with hierarchical porosity and good conductivity have attracted intensive attention in the field of electrocatalysis, especially for the oxygen reduction reaction (ORR). Large batches of fibers with uniform sizes can be easily fabricated by electrospinning technology as the precursors of carbon fibers, manifesting the potential to develop a large‐scale, low‐cost, high‐activity ORR catalyst production line for new energy devices such as fuel cells and metal–air batteries. Herein, based on a simple understanding of the ORR mechanism and electrospinning technology, those investigations on synthesizing non‐noble‐metal ORR catalysts through electrospinning in recent years are reviewed. The advantages brought by applying electrospinning technology to the preparation of ORR catalysts are briefly explained. Electrospinning fibers with specific structures for ORR catalysis obtained by innovated spinnerets are displayed. Importantly, the strategies of improving ORR performance for electrospinning fibers through substrate functionalization and active site regulation are discussed in detail. Finally, the prospects and challenges of developing electrospinning technology applied to non‐noble metal ORR electrocatalysis are proposed.

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“…The enhanced activity is mainly due to the synergistic metal–metal interaction, which can effectively modify the electronic structure, offer an enhanced electric dipole, and reduce the energy barriers during the electrocatalytic processes. [ 10,11 ] In addition, a carbon‐based composite modified by transition metals and corresponding carbides, [ 12 ] selenides, [ 13 ] nitrides, [ 14,15 ] phosphides, [ 16,17 ] sulfides, [ 18–20 ] oxides, [ 21–23 ] etc. shows superior catalytic performance and the carbon substrate can accelerate ion/electron transfer for the OER/ORR.…”

Section: Introductionmentioning

confidence: 99%

Thermal Engineering of NiCo‐Codoped Carbon Nanofibers toward Enhanced Oxygen Electrocatalysis for Zn–Air Batteries

et al. 2021

Self Cite

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Electrospinning is an efficient and facile method to prepare carbon nanofibers (CFs) embedded with a NiCo alloy as efficient oxygen electrocatalysts for Zn–air batteries. The subsequent pyrolysis of electrospun‐woven is significant to the crystallization degree of CFs and NiCo alloy. Herein, the effect of the crystallization degree of the alloy and carbon on the oxygen electrocatalytic activity is explored through controlled thermal engineering (the annealing temperature). As the temperature increases, the degree of crystallization and agglomeration of nanoparticles increases simultaneously, accompanied by the increase of the graphitization degree of CFs. Among all the samples, NiCo/CF‐800 exhibits the best oxygen bifunctional catalytic activity (ΔE = 0.73 V). A Zn–air battery based on the NiCo/CF‐800 catalyst exhibits a high peak power density (168.6 mW cm−2), high specific capacity (802.6 mA h gZn−1), and excellent charge/discharge cycling stability. This work provides new insight into catalysts through thermal engineering, promoting the practical application of electrospinning as a large‐scale production method.

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N- & S-co-doped carbon nanofiber network embedded with ultrafine NiCo nanoalloy for efficient oxygen electrocatalysis and Zn–air batteries

Abstract: A 3D carbon nanofiber network embedded with ultrafine nanoparticles is prepared by electrospinning. Thioacetamide is used to prevent the aggregation of active sites.

Cited by 37 publications

References 52 publications

Ion‐Induced Formation of Hierarchical Porous Nitrogen‐Doped Carbon Materials with Enhanced Oxygen Reduction

Ion‐Induced Formation of Hierarchical Porous Nitrogen‐Doped Carbon Materials with Enhanced Oxygen Reduction

Recent Advances in Enhancing Oxygen Reduction Reaction Performance for Non‐Noble‐Metal Electrocatalysts Derived from Electrospinning

Thermal Engineering of NiCo‐Codoped Carbon Nanofibers toward Enhanced Oxygen Electrocatalysis for Zn–Air Batteries

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