Neutral Red and Ferroin as Reversible and Rapid Redox Materials for Redox Flow Batteries

Hong, Jeehoon; Kim, Ketack

doi:10.1002/cssc.201800303

Cited by 18 publications

(19 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, Kong et al. [ 18 ] reported that the transferred Au contacts have been integrated into a high‐gain CMOS inverter, indicating the fabrication of high quality 2D materials‐based CMOS logic transistors; however, direct metal deposition process is still used, which causes unwanted defects under electrical contact regions and changes the intrinsic properties of 2D materials. In addition, they reported that that the impact of the thickness of the WSe 2 on the polarity of the device is significant in the case where we use the surface contacts, whereas the impact of the thickness of the WSe 2 is not noticeable for the vdWs contacts.…”

Section: Introductionmentioning

confidence: 99%

Fermi‐Level Pinning Free High‐Performance 2D CMOS Inverter Fabricated with Van Der Waals Bottom Contacts

Ngo

Yang

Lee

et al. 2021

Adv Elect Materials

View full text Add to dashboard Cite

Effective control of 2D transistors polarity is a critical challenge in the process for integrating 2D materials into semiconductor devices. Herein, a doping‐free approach for developing tungsten diselenide (WSe2) logic devices by utilizing the van der Waals (vdWs) bottom electrical contact with platinum and indium as the high and low work function metal respectively is reported. The device structure is free from chemical disorder and crystal defects arising from metal deposition, which enables a near ideal Fermi‐level de‐pinning. With effective controllability of device polarity through metal work function change, a complementary metal‐oxide‐semiconductor field effect transistor inverter with a gain of 198 at a bias voltage of 4.5 V is achieved. This study demonstrates an ultrahigh performance 2D inverter realized by controlling the device polarity from using Fermi‐level pinning‐free vdWs bottom contacts.

show abstract

Section: Introductionmentioning

confidence: 99%

Fermi‐Level Pinning Free High‐Performance 2D CMOS Inverter Fabricated with Van Der Waals Bottom Contacts

Ngo

Yang

Lee

et al. 2021

Adv Elect Materials

View full text Add to dashboard Cite

show abstract

“…69,74 Using NR(d-BR5) as an anolyte material and tris(1,10phenanthroline)iron(II) sulfate (Fe(Phen) 3 SO 4 , ferroin, FE) as a catholyte material, Hong and Kim assembled an acidic aqueous RFB system, which displays a high Coulombic efficiency (99%) and a relatively low average voltage (∼0.6 V) due to the charged state of FE dissociating to form a mixture of FE and FeSO 4 during charge−discharge cycling test. 69 Recently, Lai et al reported two acidic aqueous RFBs by pairing NR(d-BR5) anolyte with two different catholytes (tiron and cerium methanesulfonate (Ce(CH 3 SO 3 ) 3 )). 74 The d-BR5//BQDS full cell suffered from the instability of catholyte, leading to the initial decrease of OCV while the d-BR5//Ce(CH 3 SO 3 ) 3 full cell not only exhibited a high and stable OCV of about 1.4 V but also showed satisfactory longterm stability, with ∼99.9% capacity retention after 200 charge−discharge cycles.…”

Section: Redox-active Organic Electrolytesmentioning

confidence: 99%

“…The first studies of organic electrolyte materials have been performed with a system pairing a highly soluble dihydroxybenzene derivative, tiron, with Pb/PbSO 4 in strong acidic electrolytes. , From that time there has emerged many conjugated compounds/polymers as organic electrolytes for aqueous flow batteries (Figure and Table ). In an acidic aqueous system the organic anolyte materials include the derivatives/polymers of quinone, phenazine, imide, and so on, ,,,,,− while the organic catholyte materials cover many derivatives/polymers of quinone, thiazine dye, imide, and so on. − ,,,,, …”

Section: Redox-active Organic Electrolytesmentioning

confidence: 99%

Organic Flow Batteries: Recent Progress and Perspectives

Cao

Tian

et al. 2020

Energy Fuels

View full text Add to dashboard Cite

As a necessary supplement to clean renewable energy, aqueous flow batteries have become one of the most promising next-generation energy storage and conversion devices because of their excellent safety, high efficiency, flexibility, low cost, and particular capability of being scaled severally in light of energy and power density. The water-soluble redox-active electrolytes are the core components of aqueous flow batteries. The redox-active organic molecules have leaped to the more important electrolytes than conventional inorganic species because of their structural diversity, tailorability, and potential low cost. Much research work was conducted on organic electrolytes for designing high-performance aqueous flow batteries. The motivation of this review is to summarize and present the structure features, property evaluation methods, performance improvement schemes and battery design principles. The detailed functionalization methods to improve the physical and chemical performances of organic electrolytes including redox potential, reaction kinetic rate, solubility, and permeability have been emphatically provided and analyzed. Meanwhile, the further development prospect of aqueous organic electrolytes was put forward.

show abstract

“…Aza-aromatics, which contain nitrogen atoms in the aryl rings, have recently been explored as candidate ARFB reactants. [19][20][21][22][23][24] In particular, Aziz et al 19 and Kwon et al 23 have independently reported alloxazines (also called flavins) that show reversible, radical free redox cycling in alkaline ARFBs with very high current efficiency (99.7 %) and capacity retention (> 99.98 %) per cycle. In these studies, the unsubstituted alloxazines had low solubility, which could be tuned further, along with other key chemical and electrochemical properties.…”

Section: Introductionmentioning

confidence: 99%

A Quantitative Evaluation of Computational Methods to Accelerate the Study of Alloxazine-Derived Electroactive Compounds for Energy Storage

Zhang¹,

Khetan²,

Er³

2020

Preprint

View full text Add to dashboard Cite

Alloxazines are a promising class of organic electroactive molecules for application in aqueous redox flow batteries. Preliminary studies show that structural modifications of alloxazines with electron-donating and/or -withdrawing functional groups help in tuning of their redox properties. High-throughput computational screening enables rational and time-efficient discovery of functional compounds. The effectiveness of high-throughput computational screening efforts is strongly dependent on the accuracy and speed at which the performance descriptors are estimated for a large pool of candidate compounds. Here, we performed a quantitative study to assess the performance of computational methods, including the forcefield based molecular mechanics, semi-empirical quantum mechanics, density functional based tight binding, and density functional theory, on the basis of their accuracy and computational cost in predicting the redox potentials of electroactive alloxazines. We compared the performances of various energy-based descriptors, including the redox reaction energy and the frontier orbital energies of the reactant and product molecules. We found that the lowest unoccupied molecular orbital energy of the reactant molecules is the best performing descriptor for the alloxazines, which is in contrast to other classes of molecules, such as quinones that we reported earlier. Importantly, we present a flexible<i> in silico</i> approach to accelerate both the singly and the high-throughput computational screening studies, therewithal considering the level of accuracy <i>vs</i> measured electrochemical data, that is principally applicable for the discovery of efficient, alloxazine-derived organic compounds for energy storage in aqueous redox flow batteries.

show abstract

Neutral Red and Ferroin as Reversible and Rapid Redox Materials for Redox Flow Batteries

Cited by 18 publications

References 43 publications

Fermi‐Level Pinning Free High‐Performance 2D CMOS Inverter Fabricated with Van Der Waals Bottom Contacts

Fermi‐Level Pinning Free High‐Performance 2D CMOS Inverter Fabricated with Van Der Waals Bottom Contacts

Organic Flow Batteries: Recent Progress and Perspectives

A Quantitative Evaluation of Computational Methods to Accelerate the Study of Alloxazine-Derived Electroactive Compounds for Energy Storage

Contact Info

Product

Resources

About