Mechanism and Key Parameters for Catalyst Evaluation

  • Aneeya Kumar Samantara
  • Satyajit Ratha
Part of the SpringerBriefs in Materials book series (BRIEFSMATERIALS)


Both the hydrogen evolution and oxygen evolution reaction follows a multi electron catalytic path and the mechanism strongly depends on the types of electrolyte used for the electrolysis. Also there are various key parameters available to evaluate the performances of a particular electrocatalyst. In this chapter, detailed discussion on the mechanism of both the HER and OER in acidic and alkaline electrolyte is presented. Moreover, emphasis has been given on the calculation of different key parameters like overpotential, Tafel slope, electrochemical active surface area, Faradic efficiency, Turnover frequency, long cycle life etc. used for efficiency evaluation of a catalyst.


Acid electrolyte Alkaline electrolyte Mechanism Overpotential Tafel slope Faradic efficiency ECSA Mass activity Long cycle life 


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Copyright information

© The Author(s), under exclusive license to Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Aneeya Kumar Samantara
    • 1
  • Satyajit Ratha
    • 2
  1. 1.School of Chemical SciencesNational Institute of Science Education and ResearchKhordhaIndia
  2. 2.School of Basic SciencesIndian Institute of TechnologyBhubaneswarIndia

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