Theoretical Study on Solubility from Pt Electrocatalyst and Reactivity in Electrolyte Environment of Pt Complex in PEFC

Table 10

Reduction energy from Pt(IV) to Pt(II) complexes with various dielectric constants. Unit is V.

Pt(IV) complex ↔ pt(II) complex	5.0	20.0	61.0
(𝟏) [Pt(H2O)6]^4+ + 2e^−↔ (𝟏) [Pt(H2O)4]^2+ + 2H2O	6.12	3.81	3.21
(𝟐) [Pt(H2O)5(OH)]^3+ + 2e^−↔ (𝟐) [Pt(H2O)3(OH)]^+ + 2H2O	4.22	2.71	2.27
(𝟑) [Pt(H2O)4(OH)2]^2+ + 2e^−↔ (𝟑) [Pt(H2O)2(OH)2] + 2H2O	2.46	1.68	1.47
(𝟒) [Pt(H2O)3(OH)3]^+ + 2e^−↔ (𝟒) [Pt(H2O)(OH)3]^− + 2H2O	0.60	0.66	0.71
(𝟓) [Pt(H2O)2(OH)4] + 2e^−↔ (𝟓) [Pt(OH)4]^2− + 2H2O	−0.99	−0.13	0.14