Researchers in Australia found stainless steel can recover 93% of the silver from old solar panels
Published by Yahoo News
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Old solar panels contain only a tiny amount of silver by weight.
Old solar panels contain only a tiny amount of silver by weight
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That small fraction of silver carries enormous value.
that small fraction carries enormous value
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Australian researchers say stainless steel could offer a practical way to recover much of that metal instead of letting it go to waste, according to a study covered by pv magazine
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The study brought together researchers from the University of Newcastle in Australia, CSIRO Energy, and PV Industries to examine how electrochemical conditions shape silver recovery from end-of-life solar modules
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The work was published in Electrochimica Acta.
The work was published in Electrochimica Acta under the title: "A parametric analysis of electrochemical variables in silver recovery for solar module recycling."
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Using a nitric-acid-based electrolyte meant to mimic dissolved silver from recycled solar cells, the team compared silver, 316L stainless steel, copper, and graphite as cathodes while focusing on three variables: electrode material, current density, and copper contamination.
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Silver represents only around 0.03% of the weight of a complete PV module.
"Although silver represents only around 0.03% of the weight of a complete PV module
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Silver accounts for half of the material value of a PV module.
it accounts for half of the material value
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"85–95% of the world's silver reserves could be locked away in PV modules by 2050."
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Graphite failed to produce a consistently stable silver deposit.
Graphite failed to produce a consistently stable silver deposit
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The copper cathode dissolved into the electrolyte during deposition.
the copper cathode dissolved into the electrolyte during deposition
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316L stainless steel came close to matching silver itself.
while 316L stainless steel came close to matching silver itself
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Recovery improved as current density increased, up to -35 mA cm⁻².
Recovery improved as current density increased, but only up to -35 mA cm⁻²;
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Beyond -35 mA cm⁻², performance deteriorated.
beyond that level, performance deteriorated.
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The study helps pinpoint the operating conditions that could make large-scale silver recovery more reliable
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Stainless steel stands out as a stable candidate among the materials tested.
and stainless steel stands out as a stable candidate among the materials tested
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Higher current density increased recovery and Faradaic efficiency to a point.
Higher current density increased recovery and Faradaic efficiency to a point
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while copper in the solution changed the electrochemical behavior and influenced the shape of the silver deposit
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Recovered silver showed no evidence of copper co‑deposition at the concentrations tested.
At the concentrations tested, the recovered silver showed no evidence of copper co-deposition.
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"It was found that stainless steel delivered comparable performance to silver, achieving an average recovery rate of 93% and a Faradaic efficiency of 92%, while offering greater stability and avoiding contamination of the deposited silver," the researchers reported
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