• Su-Il Pyun
  • Heon-Cheol Shin
  • Jong-Won Lee
  • Joo-Young Go
Part of the Monographs in Electrochemistry book series (MOEC)


One of our research concerns is to determine the rate-determining step (RDS) for the overall lithium and hydrogen insertion into and desertion from lithium/hydrogen insertion compounds. The “slowest” reaction step among the series of reaction steps of the overall reaction is often referred to as the RDS, which is the most strongly disturbed (hindered) from the equilibrium for the RDS. In the same sense, other reaction steps are called relatively “fast” reactions for which the equilibria are practically undisturbed. Therefore, the RDS is quantitatively evaluated in terms of the overpotential, (overvoltage) η, which is defined as the difference in potential between the instantaneous actual and equilibrium values and/or “relaxation (time)” delineated by the time lag between the electrical voltage (potential) and current. The overpotential and relaxation time are also measured relative to the electrochemical equilibrium values of a “linear system,” which is effective for the constraint of electrical energy |zFE| ≪ thermal energy RT. Here, z means the oxidation number, F the Faradaic constant (96,485°C mol−1), E the electrode potential, R the gas constant, and T the absolute temperature.


Potential Step Exchange Current Density Complex Impedance Plane Ladder Network Electrical Field Force 
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  1. 1.
    Pyun SI (2002/2007) Interfacial, fractal, and bulk electrochemistry at cathode and anode materials, vol 1–3: the 1st series of collected papers to celebrate his 60th birthday; vol 4–5: the 2nd series of collected papers on the occasion of his 65th birthday, published by Research Laboratory for interfacial electrochemistry and corrosion at Korea Advanced Institute of Sciences and TechnologyGoogle Scholar
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    Han JN, Seo M, Pyun SI (2001) Analysis of anodic current transient and beam deflection transient simultaneously measured from Pd foil electrode pre-charged with hydrogen. J Electroanal Chem 499:152–160CrossRefGoogle Scholar
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    Lee JW, Pyun SI, Filipek S (2003) The kinetics of hydrogen transport through amorphous Pd82−yNiySi18 alloys (y = 0−32) by analysis of anodic current transient. Electrochim Acta 48:1603–1611CrossRefGoogle Scholar
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    Lee SJ, Pyun SI, Lee JW (2005) Investigation of hydrogen transport through Mm(Ni3.6Co0.7Mn0.4Al0.3)1.12 and Zr0.65Ti0.35Ni1.2 V0.4Mn0.4 hydride electrodes by analysis of anodic current transient. Electrochim Acta 50:1121–1130CrossRefGoogle Scholar
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    Lee JW, Pyun SI (2005) Anomalous behavior of hydrogen extraction from hydride-forming metals and alloys under impermeable boundary conditions. Electrochim Acta 50:1777–1805CrossRefGoogle Scholar
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    Lee SJ, Pyun SI (2007) Effect of annealing temperature on mixed proton transport and charge transfer-controlled oxygen reduction in gas diffusion electrode. Electrochim Acta 52:6525–6533CrossRefGoogle Scholar
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    Lee SJ, Pyun SI (2008) Oxygen reduction kinetics in nafion-impregnated gas diffusion electrode under mixed control using EIS and PCT. J Electrochem Soc 155:B1274–B1280CrossRefGoogle Scholar
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    Lee SJ, Pyun SI (2010) Kinetics of mixed-controlled oxygen reduction at nafion-impregnated Pt-alloy-dispersed carbon electrode by analysis of cathodic current transients. J Solid State Electrochem 14:775–786CrossRefGoogle Scholar
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    Lee SJ, Pyun SI, Yoon YG (2011) Pathways of diffusion mixed with subsequent reactions with examples of hydrogen extraction from hydride-forming electrode and oxygen reduction at gas diffusion electrode. J Solid State Electrochem 15:2437–2445CrossRefGoogle Scholar
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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Su-Il Pyun
    • 1
  • Heon-Cheol Shin
    • 2
  • Jong-Won Lee
    • 3
  • Joo-Young Go
    • 4
  1. 1.Dept. Materials Science & Eng. Korea Adv. Inst. of Science and Techn.Jeju National UniversityDaejeonRepublic of Korea
  2. 2.School of Materials Science & Eng.Pusan National Univ.Busan, Geumjeong-guRepublic of Korea
  3. 3.Fuel Cell Research CenterKorea Inst. of Energy ResearchDaejonRepublic of Korea
  4. 4.SB LiMotive Co., LtdGyeonggi-doRepublic of Korea

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