MOF-derived W/Zr bimetallic oxides@Carbon for comprehensively remedying melamine foam electrode defects in vanadium redox flow batteries

Zhang, Xihao; Zhang, Denghua; Liu, Lansong; Zhang, Kaiyue; Zhang, Yifan; Zhao, Jing; Han, Linting; Jing, Minghua; Liu, Jianguo; Yan, Chuanwei

doi:10.1016/j.cej.2023.143360

Cited by 15 publications

(17 citation statements)

References 66 publications

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“…Notably, the slope associated with NCNT@CF-10 surpasses those of both T-CF and NCNT@CF-5, suggesting a significantly improved mass transfer process in accordance with the Randles−Sevcik equation. 44 The improvement in mass transfer primarily stems from a 3D hierarchical network formed by NCNTs on NCNT@CF-10 as previously proved by TEM images. In addition to CV, EIS was also employed to compare the electrochemical performance of the samples.…”

Section: ■ Experimental Sectionsupporting

confidence: 52%

Controlled Construction of a N-Doped Carbon Nanotube Network Endows Carbon Felt with Superior Performances for High-Rate Vanadium Flow Batteries

Zhang,

Wang,

Zhang

et al. 2024

ACS Sustainable Chem. Eng.

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Developing carbon felt (CF) electrodes with sufficient mass transfer channels and highly active catalytic interfaces remains a great challenge for high-rate vanadium flow batteries (VFBs). Herein, a well-defined 3D hierarchical N-doped carbon nanotube (NCNT) network is designed and grown onto CF via a facile bottom-up strategy, which features a high bonding strength, controllable growth morphology, and tunable electron structure. In the strategy, ZIF-67 arrays as both precursors and catalysts are self-assembled on CF followed by decomposition of melamine as an initiator into C and N sources for controlled growth of NCNTs during pyrolysis. By precisely regulating the microstructure of ZIF-67 precursors and the usage amount of melamine, the NCNT-modified CF composite electrode simultaneously achieves fast electron transport, facile mass transport, and high catalytic performance toward VO 2+ /VO 2 + and V 2+ /V 3+ redox reactions. Electrostatic potential calculations further indicate that N dopants alter the electronic structure of CNTs and serve as the preferential sites for the adsorption of vanadium ions to promote the redox kinetics. Consequently, the battery assembled with the composite electrodes exhibits an impressive energy efficiency of 76.6% at 300 mA cm −2 and demonstrates prolonged stability throughout 550 consecutive charge−discharge cycles at 200 mA cm −2 . These encouraging achievements shed fresh insights into the controlled synthesis of CNTs onto CF for high-rate VFBs.

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Section: ■ Experimental Sectionsupporting

confidence: 52%

Controlled Construction of a N-Doped Carbon Nanotube Network Endows Carbon Felt with Superior Performances for High-Rate Vanadium Flow Batteries

Zhang,

Wang,

Zhang

et al. 2024

ACS Sustainable Chem. Eng.

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“…3a), which consistent with reported results, further confirming the successful synthesis of UiO-66. 38 After carbonization (Fig. 3b), the XRD pattern exhibits distinct diffraction peaks at 30.3°, 35.1°, 50.5°and 60.0°, which are corresponding to ZrO 2 (PDF#50-1089) crystal planes of (101), (110), ( 112) and (103), respectively.…”

Section: Resultsmentioning

confidence: 99%

Highly Active Electrospinning Electrode Based on MOF for High-Performance Vanadium Flow Batteries

Liu,

Zhang,

Zhang

et al. 2023

J. Electrochem. Soc.

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Electrospinning technology has demonstrated excellent prospects in the preparation of structurally controllable functional carbon nanofibers for vanadium redox flow batteries. However, traditional electrospinning carbon nanofibers used for vanadium flow batteries still suffer from defects in electrochemical activity. Herein, a highly active carbon nanofiber electrode based on metal-organic framework materials has been prepared. The introduction and carbonization of the metal-organic framework UiO-66 in the fibers increase the mesoporous structure of the electrode surface. Additionally, the carbonized UiO-66 forms catalytic ZrO2, which enhances the catalytic activity of the carbon nanofibers. Compared to traditional electrospinning carbon nanofibers, the carbon nanofiber electrode based on metal-organic framework exhibits significantly improved wettability and electrochemical properties, which enhance the mass transfer performance and electrochemical activity. The vanadium flow battery adopting active carbon nanofibers achieves an energy efficiency of 83.33% at 200 mA cm-2, and possesses excellent durability performance with unobvious decay after 1000 charge-discharge cycles at 200 mA cm-2. This study provides guidance for further synthesis of high-performance electrodes for vanadium redox flow batteries.

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“…Thus, graphite felt (GF) has been a popular choice for electrode material in a VRFB system due to its high anode and cathode stability, wide operating potential range, admirable conductivity, three-dimensional network structure, and affordable price. ,, However, the use of pristine GF is hindered as an electrode material due to its poor kinetics and reversibility, limited wettability, small specific surface area, and poor electrochemical activity. ,,, Consequently, several electrode modification techniques, including thermal treatment, catalyst addition, and chemical treatment, have been recently developed. , Among these, the use of catalysts to alter electrodes is a valuable way. These catalysts are classified as monometallic and metal oxides.…”

Section: Introductionmentioning

confidence: 99%

High-Entropy Oxide of (BiZrMoWCeLa)O₂ as a Novel Catalyst for Vanadium Redox Flow Batteries

Demeku,

Kabtamu,

Chen

et al. 2024

ACS Appl. Mater. Interfaces

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In this study, new fluorite high-entropy oxide (HEO), (BiZrMoWCeLa)O 2 , nanoparticles were produced using a surfactantassisted hydrothermal technique followed by calcination and were used as novel catalytic materials for vanadium redox flow batteries (VRFBs). The HEO calcined at 750 °C (HEO-750) demonstrates superior electrocatalytic activity toward V 3+ /V 2+ and VO 2+ /VO 2 + redox couples compared to those of cells assembled with other samples. The charge−discharge tests further confirm that VRFBs using the HEO-750 catalyst demonstrate excellent Coulombic efficiency, voltage efficiency, and energy efficiency of 97.22, 87.47, and 85.04% at a current density of 80 mA cm −2 and 98.10, 74.76, and 73.34% at a higher current density of 160 mA cm −2 , respectively. Moreover, with 500 charge−discharge cycles, there is no discernible degradation. These results are attributed to the calcination heat treatment, which induces the formation of a new single-phase fluorite structure, which facilitates the redox reactions of the vanadium redox couples. Furthermore, a high surface area, wettability, and plenty of oxygen vacancies can give more surface electroactive sites, improving the electrochemical performance, the charge transfer of the redox processes, and the stability of the VRFBs' electrode. This is the first report on the development of fluorite structure HEO nanoparticles in VRFBs, and it opens the door to further research into other HEOs.

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MOF-derived W/Zr bimetallic oxides@Carbon for comprehensively remedying melamine foam electrode defects in vanadium redox flow batteries

Cited by 15 publications

References 66 publications

Controlled Construction of a N-Doped Carbon Nanotube Network Endows Carbon Felt with Superior Performances for High-Rate Vanadium Flow Batteries

Controlled Construction of a N-Doped Carbon Nanotube Network Endows Carbon Felt with Superior Performances for High-Rate Vanadium Flow Batteries

Highly Active Electrospinning Electrode Based on MOF for High-Performance Vanadium Flow Batteries

High-Entropy Oxide of (BiZrMoWCeLa)O₂ as a Novel Catalyst for Vanadium Redox Flow Batteries

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MOF-derived W/Zr bimetallic oxides@Carbon for comprehensively remedying melamine foam electrode defects in vanadium redox flow batteries

Cited by 15 publications

References 66 publications

Controlled Construction of a N-Doped Carbon Nanotube Network Endows Carbon Felt with Superior Performances for High-Rate Vanadium Flow Batteries

Controlled Construction of a N-Doped Carbon Nanotube Network Endows Carbon Felt with Superior Performances for High-Rate Vanadium Flow Batteries

Highly Active Electrospinning Electrode Based on MOF for High-Performance Vanadium Flow Batteries

High-Entropy Oxide of (BiZrMoWCeLa)O2 as a Novel Catalyst for Vanadium Redox Flow Batteries

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Product

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High-Entropy Oxide of (BiZrMoWCeLa)O₂ as a Novel Catalyst for Vanadium Redox Flow Batteries