The Corrosion of Zinc in KOH Solutions

Dirkse, T. P.; Timmer, R.

doi:10.1149/1.2411786

Cited by 49 publications

(32 citation statements)

References 3 publications

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“…They found a decrease of hydrogen production with increasing KOH concentration and with increasing mercury content of the electrode. Dirkse and Timmer [10] obtained similar results for zincate-free alkaline media. In zincatesaturated alkaline solutions zinc electrode corrosion was found to decrease significantly.…”

Section: Introductionmentioning

confidence: 56%

“…Dirkse and Timmer [10] only discussed zinc electrode corrosion in concentrated alkaline electrolytes (> 35% KOH). If it is assumed that the anodic process determines the corrosion rate, it is likely that the increase of corrosion with increasing KOH concentration can be attributed to the increasing solubility of the protective layer of ZnO or Zn(OH)2 on the electrode surface.…”

Section: The Corrosion Of Zincmentioning

confidence: 99%

“…Combination of Equations 3, 8 and 9 and assuming that I~ < 0) is equal to I ~ i.e. during the period in between deposition experiments the amount of dissolved hydrogen remains constant, yields IH2 = (/RE + I~~ < 0) --I~~ (10) At low KOH concentration i~orr, the corrosion at open circuit potential, and I~~ < 0) are of almost no significance, whereas at high KOH concentration they cannot be neglected (cf. Fig.…”

Section: The Calculation Of the Hydrogen Currentmentioning

confidence: 99%

“…However, the most commonly used techniques are less applicable when very small amounts of hydrogen have to be determined; for example, the measurement of the total volume of H 2 [9,10] is impossible, because the hydrogen solubility in alkaline zincate electrolytes is unknown. Also, the determination of the total weight of the zinc deposit and the electrochemical stripping of zinc [1,2,4,8] are only accurate when the zinc deposit is adherent and the corrosion of zinc is negligible.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen production during zinc deposition from alkaline zincate solutions

1988

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The determination of the amount of hydrogen produced during the electrodeposition of zinc from alkaline zincate solutions was carried out using the rotating ring-disc electrode (RRDE) technique. The experimental conditions for which the RRDE technique offers reliable results are discussed. Hydrogen production during zinc deposition was studied for a range of cathodic (disc) current densities (20-500 A m -2) and electrolyte compositions (1-7 M KOH, 0.01-0.2 M zincate). It was found that an increasing amount of hydrogen was formed with increasing (disc) current density and decreasing KOH and zincate concentration. The impact of hydrogen formation during the charging process on nickel oxide/zinc secondary battery performance is expected to be small. It is concluded that in battery electrolytes (8 M KOH, 1 M zincate) hydrogen is formed chiefly by corrosion of the zinc electrode rather than by electrochemical formation durirtg the electrochemical reduction of zinc.

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Section: Introductionmentioning

confidence: 56%

Section: The Corrosion Of Zincmentioning

confidence: 99%

Section: The Calculation Of the Hydrogen Currentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrogen production during zinc deposition from alkaline zincate solutions

1988

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“…[4] Zinc was added with mercury to suppress the evolution of hydrogen gas brought on by the selfdischarge reactions of zinc and by the increase in internal cell impedance. [5][6][7][8][9][10][11][12][13][14][15][16][17][18] The use of mercury has become an environmental issue, and the attention has been focused on developing mercury-free batteries. In general, either zinc or its alloys are used as anodes in these batteries.…”

mentioning

confidence: 99%

Corrosion Study of Zinc, Nickel, and Zinc-Nickel Alloys in Alkaline Solutions by Tafel Plot and Impedance Techniques

El-Sayed

Mohran

El‐Lateef

2011

Metall Mater Trans A

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The article describes the use of Tafel plot and electrochemical impedance spectroscopy (EIS) techniques, in order to study the corrosion process of pure zinc, nickel, and synthetic Zn-Ni alloys in various concentrations (0.25 to 1 M) of KOH solution in a temperature range 298 K to 328 K (25°C to 55°C). The corrosion rate increases with increasing both concentration of KOH and temperature for all investigated electrodes. The results showed that the increase in Ni content improves the corrosion resistance and increases the barrier of activation energy, and the higher value of corrosion resistance is obtained at 10 pct Ni. The electrochemical measurements using two mentioned techniques are in good agreement with the results of microhardness in that the microhardness gradually increases with increasing Ni content in the alloy. Thus, the corrosion rate of these alloys is significantly reduced compared with that of pure zinc. It is observed that the Warburg tail at low frequency completely disappears at the applied potentials in the case of alloy IV (10 pct Ni) only. This indicates that the diffusion of Zn ion species is strongly reduced. Therefore, addition of Ni to Zn has a beneficial effect, because it leads to lower loss of anode material. The results obtained at certain positive potential (+420 mV vs SCE) exhibited that the semicircle diameter in the case of alloys is lower compared with that of pure zinc. This result means that the values of the charge transfer resistance (R ct ) in the case of alloys are decreased, due to the breakdown of the oxide layer at this potential. This behavior can be considered as an important criterion for a good battery anode, due to reactivation of the alloy surface at certain positive potential (+0.420 V vs SCE) and suppression of hydrogen gas compared with those of pure zinc.

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Investigating Degradation Modes in Zn‐AgO Aqueous Batteries with In Situ X‐Ray Micro Computed Tomography

Scharf

Yin

Redquest

et al. 2021

Advanced Energy Materials

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To meet growing energy demands, degradation mechanisms of energy storage devices must be better understood. As a non‐destructive tool, X‐ray Computed Tomography (CT) has been increasingly used by the battery community to perform in situ experiments that can investigate dynamic phenomena. However, few have used X‐ray CT to study representative battery systems over long cycle lifetimes (>100 cycles). Here, the in situ CT study of Zn–Ag batteries is reported and the effects of current collector parasitic gassing over long‐term storage and cycling are demonstrated. Performance representative in situ CT cells are designed that can achieve >250 cycles at a high areal capacity of 12.5 mAh cm−2. Combined with electrochemical experiments, the effects of current collector parasitic gassing are revealed with micro‐scale CT. The volume expansion and evolution of ZnO and Zn depletion are quantified with cycling and elevated temperature testing. The experimental insights are utilized to develop larger form‐factor (4 cm2) cells with electrochemically compatible current collectors. With this, over 500 cycles at a high capacity of 12.5 mAh cm−2 for a 4 cm2 form‐factor are demonstrated. This work demonstrates that in situ X‐ray CT used in long cycle‐lifetime studies can be applied to examine a multitude of battery chemistries to improve performances.

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The Corrosion of Zinc in KOH Solutions

Cited by 49 publications

References 3 publications

Hydrogen production during zinc deposition from alkaline zincate solutions

Hydrogen production during zinc deposition from alkaline zincate solutions

Corrosion Study of Zinc, Nickel, and Zinc-Nickel Alloys in Alkaline Solutions by Tafel Plot and Impedance Techniques

Investigating Degradation Modes in Zn‐AgO Aqueous Batteries with In Situ X‐Ray Micro Computed Tomography

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