NH3 was quantified by the Indophenol blue method . To 1 ml of the electrolyte sample, 1 ml of KOH solution, 500 μL of phenol nitroprusside solution and 500 μL of sodium hypochlorite solution are added and the resulting solution was incubated in the dark for half an hour. The sample changes color from colorless to blue. The sample was scanned for absorbance as a function of wavelengths from 400 to 800 nm using a visible spectrometer (Genesys 30 Visible Spectrometer). The maximum absorbance was observed at 632 nm and hence 632 nm was chosen to measure absorbances to quantify NH3. Calibration graphs (Absorbances Vs Concentration of NH3) were prepared for different concentrations of NH3 in the electrolyte. Separate calibration graphs were prepared when the concentration of the electrolyte was changed, as the absorbances were sensitive to the pH of the solution. The NH3 calibration graphs for different electrolyte compositions is provided in Figure of the supporting information.