کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9759318 | 1497707 | 2005 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The phase-shift method for determining Langmuir adsorption isotherms of over-potentially deposited hydrogen for the cathodic H2 evolution reaction at poly-Re/aqueous electrolyte interfaces
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The phase-shift method for determining Langmuir adsorption isotherms of over-potentially deposited hydrogen for the cathodic H2 evolution reaction at poly-Re/aqueous electrolyte interfaces The phase-shift method for determining Langmuir adsorption isotherms of over-potentially deposited hydrogen for the cathodic H2 evolution reaction at poly-Re/aqueous electrolyte interfaces](/preview/png/9759318.png)
چکیده انگلیسی
A linear relationship between the behavior (âÏ vs. E) of the phase shift (0°⩽âÏ⩽90°) for the optimum intermediate frequency and that (θ vs. E) of the fractional surface coverage (1⩾θ⩾0) of over-potentially deposited hydrogen (OPD H) for the cathodic H2 evolution reaction (HER), i.e., the phase-shift method, at poly-Re/0.5MH2SO4 and 0.1M KOH aqueous electrolyte interfaces has been suggested and verified using cyclic voltammetric, differential pulse voltammetric, and AC impedance techniques. At the poly-Re/0.5MH2SO4 aqueous electrolyte interface, the Langmuir adsorption isotherm (θ vs. E) of OPD H, the equilibrium constant (K=4.5Ã10â7) for OPD H, and the standard free energy (ÎGadso=36.2kJ/mol) of OPD H are determined using the phase-shift method. At the poly-Re/0.1M KOH aqueous electrolyte interface, θ vs. E of OPD H, K=1.9Ã10â6 for OPD H, and ÎGadso=32.6kJ/mol of OPD H are also determined using the phase-shift method. The applicability of the Frumkin and Temkin adsorption isotherms (θ vs. E) of OPD H for the cathodic HER at the interfaces also has been studied using the phase-shift method. The phase-shift method experimentally provides the link between the microscopic system of the adsorption sites and process of OPD H on the atoms and the macroscopic system of the electrode kinetics and thermodynamics for OPD H at the interfaces. The phase-shift method can be effectively used as a new electrochemical method to determine or estimate adsorption isotherms of intermediates for sequential reactions in electrochemical systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 30, Issue 5, April 2005, Pages 485-499
Journal: International Journal of Hydrogen Energy - Volume 30, Issue 5, April 2005, Pages 485-499
نویسندگان
Jang H. Chun, Sang K. Jeon, Keuk H. Ra, Jin Y. Chun,