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Pourbaix diagram of iron. [1] The Y axis corresponds to voltage potential. In electrochemistry, and more generally in solution chemistry, a Pourbaix diagram, also known as a potential/pH diagram, E H –pH diagram or a pE/pH diagram, is a plot of possible thermodynamically stable phases (i.e., at chemical equilibrium) of an aqueous electrochemical system.
Au 3+ + 3 e − → Au: 1.5: 2.54: 223 Platinum ... 0.28: 1.9: 53 Rhenium: 75: 7: 6: ReO ... column can be read in detail from the Pourbaix diagrams of the considered ...
CH 3 COOH + 2H + + 2e − → CH 3 CHO + H 2 O: −0.58 Many carboxylic acid: aldehyde redox reactions have a potential near this value 2 H + + 2 e − → H 2: −0.41 Non-zero value for the hydrogen potential because at pH = 7, [H +] = 10 −7 M and not 1 M as in the standard hydrogen electrode (SHE), and that: E red = -0.059 V × 7 = -0.41 V ...
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The brain maintains a pH of around 7.2 to 7.4, and from the Pourbaix diagram of platinum [3] it can be seen that at around 0.8 volts Pt at the surface will oxidize to PtO 2, and at around 1.6 volts, PtO 2 will oxidize to PtO 3. These voltages do not seem to be outside of reasonable range for neural stimulation.
Marcel Pourbaix (16 September 1904 – 28 September 1998) was a Belgian chemist and pianist. [citation needed] He performed his most well known research at the University of Brussels, studying corrosion. [1] His biggest achievement is the derivation of potential-pH, better known as “Pourbaix Diagrams”.
The platinum-group metals [a] (PGMs) are six noble, precious metallic elements clustered together in the periodic table. These elements are all transition metals in the d-block (groups 8, 9, and 10, periods 5 and 6). [1] The six platinum-group metals are ruthenium, rhodium, palladium, osmium, iridium, and platinum.
Not sure how to resolve this, the horizontal pH scale on the iron Pourbaix diagram is incorrect, counting: "0 2 4 6 8 10 11 14". I just fixed that typo in the figure's X axis. Olawlor ( talk ) 06:32, 6 April 2019 (UTC) [ reply ]