TY - JOUR
T1 - The importance of identifying the true catalyst when using Randles-Sevcik equation to calculate turnover frequency
AU - Abdi, Zahra
AU - Vandichel, Matthias
AU - Sologubenko, Alla S.
AU - Willinger, Marc Georg
AU - Shen, Jian Ren
AU - Allakhverdiev, Suleyman I.
AU - Najafpour, Mohammad Mahdi
N1 - Publisher Copyright:
© 2021 Hydrogen Energy Publications LLC
PY - 2021/11/3
Y1 - 2021/11/3
N2 - Water splitting will become important to store excess renewable electrical energy into hydrogen. Although the oxygen-evolution reaction (OER) by water oxidation is a critical reaction for water splitting, further investigations are needed to find the details of the OER mechanism for various electrocatalysts. More in particular for homogeneous electrocatalysts, the Randles-Sevcik equation has been extensively applied to determine the turnover frequency (TOF). Herein, using vitamin B12 as a case study, we show that the dynamical deposition/dissolution of the heterogeneous catalyst during OER makes the Randles-Sevcik equation too complicated to be used for calculating the TOF. Indeed, the conventionally applied post-characterization methods do not provide sufficient accuracy to prove the homogeneity of OER mechanisms; thus, using the Randles-Sevcik equation to calculate the TOF is not necessarily correct.
AB - Water splitting will become important to store excess renewable electrical energy into hydrogen. Although the oxygen-evolution reaction (OER) by water oxidation is a critical reaction for water splitting, further investigations are needed to find the details of the OER mechanism for various electrocatalysts. More in particular for homogeneous electrocatalysts, the Randles-Sevcik equation has been extensively applied to determine the turnover frequency (TOF). Herein, using vitamin B12 as a case study, we show that the dynamical deposition/dissolution of the heterogeneous catalyst during OER makes the Randles-Sevcik equation too complicated to be used for calculating the TOF. Indeed, the conventionally applied post-characterization methods do not provide sufficient accuracy to prove the homogeneity of OER mechanisms; thus, using the Randles-Sevcik equation to calculate the TOF is not necessarily correct.
KW - Metal complex
KW - Precatalyst
KW - Randles-Sevcik equation
KW - True catalyst
KW - Water oxidation
UR - http://www.scopus.com/inward/record.url?scp=85115942345&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2021.09.039
DO - 10.1016/j.ijhydene.2021.09.039
M3 - Article
AN - SCOPUS:85115942345
SN - 0360-3199
VL - 46
SP - 37774
EP - 37781
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 76
ER -
