Goal-based approach limitations

One of the most important limitations of ISO 11064 was that the scope of the standard was inappropriate for lO. This supports the opinion of some of the interviewees who stated that the standard was out of date compared to current technology. This finding supports our proposal to shift to a more goal-based approach. 

Rational optimization of performance should be the main goal in development of any chemical sensor. In order to do that, we must have some quantitative tools of determination of key performance parameters. As we have seen already, for electrochemical sensors those parameters are the charge-transfer resistance and the double-layer capacitance. Particularly the former plays a critical role. Here we outline two approaches the Tafel plots, which are simple, inexpensive, but with limited applicability, and the Electrochemical Impedance Spectroscopy (EIS), based on the equivalent electrical circuit model, which is more universal, more accurate, and has a greater didactic value. 

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