1 additional material for reviewer index to confirm that copper oxide forms on the surface in...
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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)
2
Disc in water
Before After 20 mins
3
Disc in 0.01% glutamic acid
BeforeAfter 20 mins
Solution remains clear
4
Disc in 0.01% glutamic acid & 0.5% H2O2 solution
BeforeAfter 20 mins
After 5 mins, in liquid
Solution remains clear, after 20 mins
5
Disc 0.01% glutamic acid & 10% H2O2 solution
Before
In solution, after 5 mins
After 20 mins
Solution remains clear, after 20 mins
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.
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 m3/mol
• This leads to G = -37.7 kJ/mol
Glu Conc (wt%)
Glu Conc (mM) R-s Q-Yo Q-n Rt W
Surface Coverage
0 0 8.325 0.001257 0.5946 56.9 0.03809 0
0.05 3.38 6.178 0.000609 0.6852 202 0.03058 0.718317
0.1 6.76 6.64 0.000521 0.7093 385.4 0.01973 0.852361
0.3 20.28 7.926 0.000472 0.7088 543.3 0.01565 0.89527
0.5 33.8 11.03 0.000205 0.6864 1343 0.00341 0.957632
1 67.6 17.63 0.00018 0.7052 1265 0.003355 0.95502