Self-assembled heteropolyacid on nitrogen-enriched carbon nanofiber for vanadium flow batteries

Etesami, Mohammad; Abouzari‐Lotf, Ebrahim; Sha’rani, Saidatul Sophia; Miyake, Mikio; Nia, Pooria Moozarm; Ripin, Adnan; Ahmad, Arshad

doi:10.1039/c8nr02450b

Cited by 19 publications

(6 citation statements)

References 52 publications

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“…ECNFs modified with phosphotungstic acid have been suggested as material for both VRFB electrodes [446]. Displayed CVs showed large irreversibility in terms of charge under current peaks obtained with GC as a support.…”

Section: Composite Materialsmentioning

confidence: 99%

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Holze

2018

Batteries

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Flow batteries (also: redox batteries or redox flow batteries RFB) are briefly introduced as systems for conversion and storage of electrical energy into chemical energy and back. Their place in the wide range of systems and processes for energy conversion and storage is outlined. Acceleration of electrochemical charge transfer for vanadium-based redox systems desired for improved performance efficiency of these systems is reviewed in detail; relevant data pertaining to other redox systems are added when possibly meriting attention. An attempt is made to separate effects simply caused by enlarged electrochemically active surface area and true (specific) electrocatalytic activity. Because this requires proper definition of the experimental setup and careful examination of experimental results, electrochemical methods employed in the reviewed studies are described first.

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Section: Composite Materialsmentioning

confidence: 99%

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Holze

2018

Batteries

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“…[16,38] EE is stable at 77.5% during the cycling at 60 mAcm −2 (Figure S23A, Supporting Information), which improves to 82.9% and 88.4% if we drop the current to 40 and 20 mA cm −2 (Figure S24, Supporting Information), respectively, competitive even against advanced vanadium flow batteries. [61,62] The high values of EE are dictated by the voltage efficiency (VE, Figure S23B, Supporting Information), as CE is close to unity. Given the proportionality between the VE loss and the current density, we consider the internal resistance to be the efficiencylimiting factor.…”

Section: Azfb Performancementioning

confidence: 99%

Homogenizing Zn Deposition in Hierarchical Nanoporous Cu for a High‐Current, High Areal‐Capacity Zn Flow Battery

Zhao

et al. 2023

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A Zn anode can offset the low energy density of a flow battery for a balanced approach toward electricity storage. Yet, when targeting inexpensive, long‐duration storage, the battery demands a thick Zn deposit in a porous framework, whose heterogeneity triggers frequent dendrite formation and jeopardizes the stability of the battery. Here, Cu foam is transferred into a hierarchical nanoporous electrode to homogenize the deposition. It begins with alloying the foam with Zn to form Cu5Zn8, whose depth is controlled to retain the large pores for a hydraulic permeability ≈10−11 m2. Dealloying follows to create nanoscale pores and abundant fine pits below 10 nm, where Zn can nucleate preferentially due to the Gibbs–Thomson effect, as supported by a density functional theory simulation. Morphological evolution monitored by in situ microscopy confirms uniform Zn deposition. The electrode delivers 200 h of stable cycles in a Zn–I2 flow battery at 60 mAh cm−2 and 60 mA cm−2, performance that meets practical demands.

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“…5 (a) Coulombic, voltage and energy efficiencies of the PCNF-1200-8 electrode at a current density of 100 mA cm −2 ; (b) comparison of energy efficiencies of CNF electrodes applied in VRFBs as a function of current density. 30,[41][42][43][44][45][46][47][48][49][50][51][52]…”

Section: Author Contributionsmentioning

confidence: 99%