Citation: Fengjun Yin, Hong Liu. Derivative-extremum analysis of current-potential curves showing electrochemical kinetics in the full reversibility range[J]. Chinese Chemical Letters, ;2023, 34(1): 107185. doi: 10.1016/j.cclet.2022.01.078 shu

Derivative-extremum analysis of current-potential curves showing electrochemical kinetics in the full reversibility range

Fengjun Yin ^{a, b, c} ,
Hong Liu ^{a, b, *,}

a.
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
b.
Key Laboratory of Reservoir Aquatic Environment, Chinese Academy of Sciences, Chongqing 400714, China
c.
China University of Chinese Academy of Sciences, Beijing 100049, China

liuhong@cigit.ac.cn

Received Date: 2 November 2021
Revised Date: 19 December 2021
Accepted Date: 28 January 2022
Available Online: 3 February 2022

Figures(3)

Derivative-extremum analysis (DEA) of j-E curves is a newly proposed method of half wave potential (E_1/2) and activation feature extraction from steady-state voltammetry. Here, the DEA is demonstrated to be valid in the full range of reversibility using numerical simulations with a derived universal electrode equation, providing a novel perspective of electrochemical kinetics in the reversibility domain. The results reveal that E_1/2 is a better choice of the reference potential instead of equilibrium potential (E_eq) in electrode equations, especially since E_eq is meaningless in an irreversible case. The equations referenced with standard potential, E_1/2 and E_eq, are summarized in three tables, and their applications in parameter determinations are specified. Finally, reversibility is proved to be a relative measure between kinetic slowness and mass transport of electroactive species, and the reversibility classifications are proposed according to the DEA feature in the reversibility domain. This work, based on the DEA principle, refines the electrode equation forms and generalizes their applicability in the full range of reversibility.
- Reversibility,
- Electrochemical kinetics,
- Half-wave potential,
- Derivative-extremum analysis,
- Parameter determinations
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沈阳化工大学材料科学与工程学院沈阳 110142