Assessing the electron transfer and oxygen mass transfer of the oxygen reduction reaction using a new electrode kinetic equation. Issue 23 (1st June 2018)

• Record Type: Journal Article
• Authors: Yin, Fengjun; Liu, Yuan; Wang, Chuan; Liu, Hong
• Is Part Of: Physical chemistry chemical physics. Volume 20:Issue 23(2018)
• Page Start: 16159
• Page End: 16166
• Publication Date: 2018-06-01
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c8cp01305e
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : A new kinetic equation describing the full-scale polarizations, provides a facile approach for assessing ORR performance, highlighting oxygen-mass transfer evaluation. Abstract : The oxygen reduction reaction (ORR), which is widely employed for energy harvesting and environmental purification, requires an electrode kinetic equation for assessing the electron transfer (ET) and oxygen mass transfer (OMT). Herein, we establish a new kinetic equation in conjunction with the ET kinetics and OMT flux, creating a parameter ( k O2 ) characterizing the effect of OMT. This equation allows for the nonlinear fitting of polarizations in full scale and outputs reliable parameters, including α (ET coefficient), j 0 (exchange current density) and k O2 . The performance is superior to the Tafel equation by outputting reliable values of α and j 0, and covers the function of the Koutecky–Levich equation to calculate the electron transfer number ( n ) as well. Furthermore, by means of k O2, the assessment of OMT becomes available, disclosing the facilitating effect brought about by the porous structure on the ORR rate. Consequently, the new equation provides a reliable and facile approach for assessing the performance of electrode reaction systems and electrocatalysts.