Extraction of Silver via Electrowinning for Solar Panel Recycling Cooper Tezak, chemical engineering Mentor: Dr. Meng Tao SEMTE Purpose 0.6 V 70 75 80 85 90 95 100 0.58 0.63 0.68 0.73 0.78 % Mass Recovery Voltage (V) Voltage % Mass Recovery 0.6 89.15% 0.65 98.78% 0.7 96.36% 0.75 86.62% 0.8 78.58% 0.7 V 0.7V appears to be the optimal voltage for mass recovery and product purity Future Research SEM Morphology Develop an electrochemical process for recovering silver from end-of-life solar modules. Specifically, find the ideal conditions for the electrowinning of dissolved silver from an HF solution Varied Voltage Trials Chronoamperometry 0.6V 1k 0.7V 1k Current should approach zero as silver is extracted from the solution, however under experimental conditions the current remains constant at the max value. A possible parasitic reaction is taking place at the cathode: 2 + 2 + + 2 − ⇌ 2 2 A Nitrogen purge environment will eliminate all parasitic oxygen reactions and allow for a higher current efficiency. Trials need to be conducted at varying voltages and times to determine the best conditions under nitrogen purge Conclusion References The experimental setup is insufficient for controlling environmental factors that affect the reaction significantly. Corrosion at the vapor-liquid interface at the working electrode prevents the experiment from running for more than 20 hours without failing prematurely. Bard AJ, Faulkner LR. Electrochemical Methods. New York: J. Wiley; 1986. Meng Tao. Lecture. School of Electrical Computer and Energy Engineering. 2020 Harris DC, Lucy CA. Quantitative Chemical Analysis. New York, NY: Macmillan Learning; 2020.

Extraction of Silver via Electrowinning for Solar Panel

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Page 1: Extraction of Silver via Electrowinning for Solar Panel

Extraction of Silver via Electrowinning for Solar Panel RecyclingCooper Tezak, chemical engineering

Mentor: Dr. Meng TaoSEMTE

Purpose

0.6 V

100

0.58 0.63 0.68 0.73 0.78

% M

ass

Rec

ove

Voltage (V)

Voltage % Mass Recovery

0.6 89.15%

0.65 98.78%

0.7 96.36%

0.75 86.62%

0.8 78.58%

0.7 V

0.7V appears to be the optimal voltage for mass recovery and product purity

Experimental Setup

Future Research

SEM Morphology

Develop an electrochemical process for recovering silver from end-of-life solar modules. Specifically, find the ideal conditions for the electrowinning of dissolved silver from an HF solution

Varied Voltage Trials

Chronoamperometry

0.6V 1k 0.7V 1k

Current should approach zero as silver is extracted from the solution, however under experimental conditions the current remains constant at the max value. A possible parasitic reaction is taking place at the cathode:

𝑂2 𝑔 + 2𝐻+ + 2𝑒− ⇌ 𝐻2𝑂2

A Nitrogen purge environment will eliminate all parasitic oxygen reactions and allow for a higher current efficiency. Trials need to be conducted at varying voltages and times to determine the best conditions under nitrogen purge

Conclusion

References

The experimental setup is insufficient for controlling environmental factors that affect the reaction significantly. Corrosion at the vapor-liquid interface at the working electrode prevents the experiment from running for more than 20 hours without failing prematurely.

Bard AJ, Faulkner LR. Electrochemical Methods. New York: J. Wiley; 1986.Meng Tao. Lecture. School of Electrical Computer and Energy Engineering. 2020Harris DC, Lucy CA. Quantitative Chemical Analysis. New York, NY: Macmillan Learning; 2020.