Open circuit potential amperometry and voltammetry
First Claim
1. A method of determining the oxidation state of a compound, said method comprising:
- disconnecting an electrode from an electrochemical cell comprising said compound to allow said cell to reach an open circuit potential (OCP);
connecting said electrochemical cell to an externally applied potential equivalent to said open circuit potential; and
detecting a resulting current if said current exists wherein the magnitude of said current is a measure of the oxidation state of said compound.
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Abstract
This invention provides approaches to improve the signal to noise ratio (S/N) in electrochemical measurements (e.g. amperometry, voltammetry, etc.). In particular, a method is described wherein the faradaic current is temporally dissociated from the charging current associated with reading the charge of a redox-active species (e.g. a self-assembled monolayer (SAM)). This method, designated herein as open circuit potential amperometry (OCPA), quantitatively reads the charge of the redox species bound to (electrically coupled to) an electrode surface, while discriminating against both charging current(s) and amperometric signal(s) that arise, e.g. from diffusion-based species in solution.
74 Citations
32 Claims
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1. A method of determining the oxidation state of a compound, said method comprising:
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disconnecting an electrode from an electrochemical cell comprising said compound to allow said cell to reach an open circuit potential (OCP);
connecting said electrochemical cell to an externally applied potential equivalent to said open circuit potential; and
detecting a resulting current if said current exists wherein the magnitude of said current is a measure of the oxidation state of said compound. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of determining the oxidation state of a compound, said method comprising:
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applying a series of incrementally increasing voltage pulses to said compound in an electrochemical cell;
disconnecting an electrode from said electrochemical cell, after each pulse, to allow said cell to reach an open circuit potential (OCP);
connecting said electrochemical cell to an externally applied potential equivalent to said open circuit potential; and
detecting a resulting current if said current exists wherein the magnitude of said current is a measure of the oxidation state of said compound. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification