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Published byNatalie Burton Modified over 3 years ago

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1 Additional Material for Reviewer Index To confirm that copper oxide forms on the surface in presence of low concentrations of L- Glutamic acid and high concentrations of hydrogen peroxide –Next 5 slides with photos of Cu disc, before and after immersion in various solutions (slides 2-6) To evaluate the adsorption of L-glutamic acid on copper surface in the absence of peroxide –Last slide (Slide No 7)

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2 Disc in water BeforeAfter 20 mins

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3 Disc in 0.01% glutamic acid Before After 20 mins Solution remains clear

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4 Disc in 0.01% glutamic acid & 0.5% H2O2 solution Before After 20 mins After 5 mins, in liquid Solution remains clear, after 20 mins

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5 Disc 0.01% glutamic acid & 10% H2O2 solution Before In solution, after 5 mins After 20 mins Solution remains clear, after 20 mins

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6 Disc in 1% glutamic acid & 10% H2O2 solution Before In solution, after 5 mins After 20 mins After 15 mins. Note the blue color of solution After 20 mins.

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7 To evaluate L-Glu adsorption Impedance equivalent circuit fit parameters Non Linear Least Square Fit (fminsearch function in Matlab) gives, best fit K value as 74.37 m 3 /mol This leads to G = -37.7 kJ/mol Glu Conc (wt%) Glu Conc (mM)R-sQ-YoQ-nRtW Surface Coverag e 008.3250.0012570.594656.90.038090 0.053.386.1780.0006090.68522020.030580.718317 0.16.766.640.0005210.7093385.40.019730.852361 0.320.287.9260.0004720.7088543.30.015650.89527 0.533.811.030.0002050.686413430.003410.957632 167.617.630.000180.705212650.0033550.95502

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