Model describing of the process of electrodeposition of loose zinc deposits in pulsed potential modes

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The structural characteristics of loose zinc deposits obtained in pulsed potential modes were calculated using a phenomenological model. Increasing the duty cycle leads to increased anodic dissolution during pauses and obtaining denser deposits, due to the formation of dendrites with fewer vertices, but with a larger diameter compared to deposits obtained in the potentiostatic mode. The linear dependence of the diameter of the tips of dendrites forming a loose zinc deposit on the duty cycle was found. It is shown that there is a critical time corresponding to the achievement of zero deposit growth rate when the metal deposited during the pulse will completely dissolve during the pause.

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V. Nikitin

Ural Federal University named after the first President of Russia B.N. Yeltsin

编辑信件的主要联系方式.
Email: nikitin-viachieslav@mail.ru

Institute of Chemical Engineering

俄罗斯联邦, Yekaterinburg

T. Ostanina

Ural Federal University named after the first President of Russia B.N. Yeltsin

Email: ostni@mail.ru

Institute of Chemical Engineering

俄罗斯联邦, Yekaterinburg

V. Rudoy

Ural Federal University named after the first President of Russia B.N. Yeltsin

Email: nikitin-viachieslav@mail.ru

Institute of Chemical Engineering

俄罗斯联邦, Yekaterinburg

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2. Fig. 1. Diagram (a) and photo (b) of a cylindrical electrode of height H with a layer of loose sediment of thickness y(t); d0 is the initial diameter of the electrode; D(t) is the diameter of the electrode with sediment at time t.

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3. Fig. 2. Change in current strength over time during zinc deposition in potentiostatic mode (E = –0.38 V).

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4. Fig. 3. Current change during zinc deposition in the pulsed potential setting mode (C = 2.5, τimp/τp = 20 s / 30 s). The inset shows an enlarged image of the 47th and 48th electrolysis cycles.

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5. Fig. 4. Change in the thickness of loose zinc deposits during electrolysis. The numbers on the graphs indicate the duty cycle values. Markers are experimental data; line is approximation according to equation (12).

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6. Fig. 5. Change in the differential yield of zinc by current during electrolysis. The numbers on the graph indicate the duty cycle values. Markers are experimental data; line is approximation according to equation (13).

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7. Fig. 6. Total amount of electricity in potentiostatic mode (C = 1). The inset shows an enlarged image of the first minutes of electrolysis. The dotted line is the curve obtained by numerical integration of the I(t) dependence (equation (16)); the solid line is the approximation using polynomial (20).

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8. Fig. 7. Effective amount of electricity in pulsed modes of potential setting. The numbers on the graph indicate the duty cycle values. The dotted line is the curve obtained by numerical integration of the I(t) dependence (equation (17)); the solid line is the approximation using the polynomial (20).

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9. Fig. 8. Change in the number and density of the dendritic vertices at the sediment growth front in the stationary (a) and pulsed modes of setting the potential (b). The numbers on the graphs indicate the duty cycle values. Solid lines are Nsp curves; dotted lines are N curves.

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10. Fig. 9. Change in the average distance between the vertices of zinc dendrites over time in different potential setting modes. The numbers on the graph indicate the duty cycle values.

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11. Fig. 10. Dependence of the diameter of the dendritic tips on the duty cycle.

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12. Fig. 11. Change in density of loose zinc sediment by its thickness. The numbers on the graph indicate the porosity values. Markers are experimental values ​​obtained according to equation (26) using the experimental values ​​of y, CedZn and QZn; lines are approximations according to equation (30).

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13. Fig. 12. Change in the ratio between the cathode and anode amounts of electricity during electrolysis. The numbers on the graphs indicate the duty cycle values.

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14. Fig. 13. Micrographs of loose zinc deposits obtained in potentiostatic (a) and pulsed mode (30 s/30 s, C = 2) (b). Deposition time 10 min.

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