Conductivity of  KOH  Electrolyte Supersaturated with Zincate

Liu, Ming‐Brian; Faulds, B. R.; Cook, G. M.; Yao, N.P.

doi:10.1149/1.2127187

Cited by 22 publications

(15 citation statements)

References 16 publications

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“…Therefore, the parameters represent this battery type. Decades ago, thermodynamics [64,57,65,66,67,68] and ionic transport [69,70,71,72,39,30,73,74,64,73,34,67,75,76] in the aqueous alkaline electrolyte (32 weight percent KOH) were accurately studied with experiments. We discuss the parameters in the Supplementary Materials A.…”

Section: Parameterizationmentioning

confidence: 99%

“…Liu et al [73] show that a linear mixture rule is applicable for the determination of the conductivity κ in concentrated KOH based systems…”

Section: Supplementary Information Nucleation and Growth Of Zinc Oxidmentioning

confidence: 99%

“…where the conductivity of binary potassium hydroxide solutions κ KOH = Λ KOH c K + is fitted by See et al [74] as a function of potassium concentration. The equivalent conductivities of zincate is Λ Zn(OH) = 4 = 7 · 10 −4 Sm 2 mol −1 [73] and of carbonate are Λ Zn(OH) = 4 = (−7.14c K + /c std + 78.18) · 10 −4 Sm 2 mol −1 [64,73].…”

Section: Supplementary Information Nucleation and Growth Of Zinc Oxidmentioning

confidence: 99%

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Modeling nucleation and growth of zinc oxide during discharge of primary zinc-air batteries

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Metal-air batteries are among the most promising next-generation energy storage devices. Relying on abundant materials and offering high energy densities, potential applications lie in the fields of electro-mobility, portable electronics, and stationary grid applications. Now, research on secondary zinc-air batteries is revived, which are commercialized as primary hearing aid batteries. One of the main obstacles for making zinc-air batteries rechargeable is their poor lifetime due to the degradation of alkaline electrolyte in contact with atmospheric carbon dioxide. In this article, we present a continuum theory of a commercial Varta PowerOne button cell. Our model contains dissolution of zinc and nucleation and growth of zinc oxide in the anode, thermodynamically consistent electrolyte transport in porous media, and multi-phase coexistance in the gas diffusion electrode. We perform electrochemical measurements and validate our model. Excellent agreement between theory and experiment is found and novel insights into the role of zinc oxide nucleation and growth and carbon dioxide dissolution for discharge and lifetime is presented. We demonstrate the implications of our work for the development of rechargeable zinc-air batteries. Highlights• Modeling and simulating of VARTA button cell • Validation of galvanostatic discharge and lifetime analysis• Nucleation and growth of ZnO and its impact on discharge curve• Degradation due to carbonation of alkaline electrolyte (Birger Horstmann) promising candidates to fulfill this demand, because of their high specific energy density and the use of cheap and abundant materials. These batteries are open at the cathode and use atmospheric oxygen.Several metals, e.g., lithium, sodium, and zinc, are potential active anode materials in metal-air cells [1]. The high theoretical energy density of lithium-air batteries has stimulated a lot of research [2]. For aprotic electrolytes, the challenge is to influence growth mechanisms in order to maximize capacity, while maintaining sufficient reversibility [3,4,5,6,7,8,9]. Aqueous lithium-air batteries require a stable lithium conducting anode protection [10,11,12,13]. Non-aqueous sodium-air cells rely

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Section: Parameterizationmentioning

confidence: 99%

“…Liu et al [73] show that a linear mixture rule is applicable for the determination of the conductivity κ in concentrated KOH based systems…”

Section: Supplementary Information Nucleation and Growth Of Zinc Oxidmentioning

confidence: 99%

Section: Supplementary Information Nucleation and Growth Of Zinc Oxidmentioning

confidence: 99%

See 1 more Smart Citation

Modeling nucleation and growth of zinc oxide during discharge of primary zinc-air batteries

Stamm

Varzi

Latz

et al. 2017

Journal of Power Sources

104

145

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“…Po přibližně 10 dnech dojde k zapasivování povrchu tvorbou velice kompaktní vrstvy povlaku tvořeného krystaly ɛ-Zn(OH) 2 . Konečně při pH nad 13,3 se dále již netvoří souvislý ochranný povlak z ɛ-Zn(OH) 2 a korozní rychlost rychle vzrůstá s rostoucím pH, až je povlak žárového zinku kompletně rozpuštěn do několika málo měsíců [5,16,37,38]. Někteří autoři připouštějí, že za přechod koroze zinku z aktivního do pasivního stavu zodpovídá jednoznačně amorfní či krystalická forma Zn(OH) 2 [39].…”

Section: Vliv Vápenatých Kationtů Na Korozní Chování žáRově Zinkovanéunclassified

Influence of calcium cations on the corrosion behavior of hot-dip galvanized steel in model concrete pore solutions

Pokorný

Kouřil

2019

Koroze a Ochrana Materialu

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In this paper, the influence of calcium cations on the corrosion behavior of hot-dip galvanized steel in model concrete pore solutions is evaluated by means of conventional electrochemical methods (measurement of free corosion potencial and polarization resistance), surface analysis methods (optical and confocal microscopy) and XRD phase analysis of precipitated corrosion products. The results of these experiments confirm the conclusions of the current work on a similar topic, i.e. the crystalline calcium based corrosion products Ca[Zn(OH)3]2·2H2O are not able passivate effectively surface of hot-dip galvanized steel in model of concrete pore solutions (pH 12.6; 13.0). If passivation occurs, a mixed Ca[Zn(OH)3]2·2H2O, ZnO and Zn(OH)2 is involved.

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“…Zinc hydroxide (ε -modification) together with ZnO constitute the minor part of corrosion products on zinc or hot-dip galvanized steel [4,5,6]. Major component in alkaline environment in presence of Ca(OH) 2 is Ca[Zn(OH) 3 ] 2 •2 H 2 O.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Corrosion of Zinc Powder on Mechanical Properties of Concrete

Pokorný¹

2016

Ceramics - Silikaty

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This paper studies the effect of zinc corrosion in fresh concrete on the process of its hydration and evolution of common mechanical properties. Process of hydration was monitored by temperature measurement of hydrating concrete contaminated with zinc powder (0.5; 5.0 wt. %) in closed system. Mechanical properties were monitored in similarly contaminated concrete samples (compressive cubic strength, compression modulus of elasticity). The results suggest that zinc corrosion products retard the concrete hydration and evolution of mechanical properties, however, forming hydrogen also has some negative effect.

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Conductivity of KOH Electrolyte Supersaturated with Zincate

Cited by 22 publications

References 16 publications

Modeling nucleation and growth of zinc oxide during discharge of primary zinc-air batteries

Modeling nucleation and growth of zinc oxide during discharge of primary zinc-air batteries

Influence of calcium cations on the corrosion behavior of hot-dip galvanized steel in model concrete pore solutions

The Influence of Corrosion of Zinc Powder on Mechanical Properties of Concrete

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