A feasible strategy to enhance mass transfer property of carbon nanofibers electrode in vanadium redox flow battery

Jing, Minghua; Qi, Xiaochen; An, Xinyu; Ma, Xiumei; Fang, Dawei; Fan, Xinzhuang; Liu, Jianguo; Yan, Chuanwei

doi:10.1016/j.electacta.2021.138879

Cited by 18 publications

(10 citation statements)

References 60 publications

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“…20,46,48,50 From experimental ex situ characterisation coupled to DFT prediction of QS-values, D2 has recently been assigned to Fe-Nx moieties in ferrous state and with low or medium spin state. 50 Moreover, it was shown that the D2 signal is independent of the cathode potential and atmosphere (O2-free or O2-rich) 51 , supporting the fact that it corresponds either to sites situated in the bulk of the carbon matrix, and/or to surface sites that bind O2 weakly. The minor D3 component can be unambiguously assigned to high-spin ferrous centers, due to its high isomer shift of 1.04 mm s -1 (Table S5, supplementary note S4).…”

Section: This Is Favourable To Stabilise Large Quantities Of Fe Ions ...mentioning

confidence: 84%

High loading of single atomic iron sites in Fe–NC oxygen reduction catalysts for proton exchange membrane fuel cells

et al. 2022

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: This Is Favourable To Stabilise Large Quantities Of Fe Ions ...mentioning

confidence: 84%

High loading of single atomic iron sites in Fe–NC oxygen reduction catalysts for proton exchange membrane fuel cells

et al. 2022

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“…22 In addition, the charge transfer resistance on W-ECNFs was remarkably lower than that on P-ECNFs due to the enhanced ECSA and better electrocatalytic activity. 43 Both CV and EIS results had been listed in Table III, which demonstrated the validation of water vapour etching process to improve the electrode performance.…”

Section: Resultsmentioning

confidence: 87%

Green and Affordable Manufacturing Method for Multi-Scale Porous Carbon Nanofibers and Its Application in Vanadium Redox Flow Battery

Fang

Zhang

et al. 2022

J. Electrochem. Soc.

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Carbon nanofibers with multi-scale pores have been easily constructed by synchronous water etching during the carbonization process of PAN nanofibers, reducing the additional consumption of energy and time. After etching by high-temperature water vapor, the fiber surface becomes more coarse, and large amounts of etched pits are formed, effectively increasing the electrode’s specific surface area and hydrophilicity. Oxygen content is also significantly increased, which may effectively increase the electrocatalytic active sites of the electrode. Electrochemical tests verified the improved electrocatalytic activity and increased effective surface area. As a result, the VRFB single cell with water vapor etched carbon nanofibers as its electrode shows higher battery efficiencies than that with pristine carbon nanofibers; the energy efficiency improves by nearly 9.4% at 200 mA·cm-2. After 100 charge/discharge cycles, the battery efficiency has no obvious attenuation, and the capacity attenuation rate of single cycle is nearly 0.26%，suggesting a satisfactory cycling stability. This green and simple method for constructing multi-scale porous carbon nanofibers electrode is expected to achieve large-scale production of high-performance electrode materials, and can be applied in various electrochemical energy storage systems.

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“…However, the increased cost of electrodes as well as the potential electrolyte contamination caused by this strategy cannot be neglected. [29,30] Therefore, carbon nanomaterials such as carbon nanofibers, [31] carbon nanotubes, [32] carbon nanospheres, [33] carbon dots, [34] and graphene [35,36] which share the same elementary composition as the carbon-based electrode materials have been widely used to decorate the electrodes.…”

Section: Introductionmentioning

confidence: 99%

Carbon Felt Decorated with Carbon Derived from Spent Asphalt as a Low‐cost and High‐performance Electrode for Vanadium Redox Flow Batteries

et al. 2022

ChemNanoMat

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Vanadium redox flow batteries (VRFBs) have attracted much attention in the field of energy storage systems owing to their safety, long-cycle life, and feasible scalability. However, the market penetration of VRFBs is still hindered by the poor performance of current carbon-based electrodes. Herein, spent asphalt is employed as an efficient and low-cost precursor to generate carbon decorating carbon felt for VRFB applications. By thermal decomposition treatment, the spent asphalt is converted into highly active pyrolytic carbon and deposited on surfaces of carbon felt. The as-prepared carbon felt with increased active sites and improved hydrophility displays superior performance towards redox reactions of VO 2 + /VO 2 + in terms of better electrochemical reversibility and faster reaction kinetics. Therefore, the VRFB cell with the carbon felt decorated with carbon derived from spent asphalt as cathode shows 85% energy efficiency which is higher than the pristine carbon felt cathode by 9%. Meanwhile, the energy efficiency and voltage efficiency are both stable during the cell cycling. This strategy can raise the value of the spent asphalt and improve the performance of VRFBs with the decorated carbon felt electrode shedding light on their commercial applications for large-scale energy storage.

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A feasible strategy to enhance mass transfer property of carbon nanofibers electrode in vanadium redox flow battery

Cited by 18 publications

References 60 publications

High loading of single atomic iron sites in Fe–NC oxygen reduction catalysts for proton exchange membrane fuel cells

High loading of single atomic iron sites in Fe–NC oxygen reduction catalysts for proton exchange membrane fuel cells

Green and Affordable Manufacturing Method for Multi-Scale Porous Carbon Nanofibers and Its Application in Vanadium Redox Flow Battery

Carbon Felt Decorated with Carbon Derived from Spent Asphalt as a Low‐cost and High‐performance Electrode for Vanadium Redox Flow Batteries

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