Temperature Effect on Co-Based Catalysts in Oxygen
Evolution Reaction
Posted on 2018-02-22 - 16:52
Oxygen evolution
reaction (OER), as the critical step in splitting water, is a thermodynamically
“up-hill” process and requires highly efficient catalysts
to run. Arrhenius’ law suggests that the higher temperature,
the faster the reaction rate, so that a larger OER current density
can be achieved at a lower η. Herein, we report an abnormal
temperature effect on the performance of Co-based catalysts, e.g.,
Co3O4, Li2CoSiO4, and
Fe-doped Co(OH)x, in OER in alkaline electrolytes.
The OER performance reached a maximum when the temperature increased
to 65 °C, and the OER performance declined when the temperature
became higher. The mechanism was investigated by using Co3O4 as a model sample, and we propose that at an optimal
temperature (around 55–65 °C) the main rate-determining
step changes from OH– adsorption dominant to a mixed
mode and both the adsorption and the cleavage of the OH group can
be rate-determining, which leads to the fastest kinetics.
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Zhang, Guangxing; Wang, Han; Yang, Jinlong; Zhao, Qinghe; Yang, Luyi; Tang, Hanting; et al. (2018). Temperature Effect on Co-Based Catalysts in Oxygen
Evolution Reaction. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.7b03168
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AUTHORS (10)
GZ
Guangxing Zhang
HW
Han Wang
JY
Jinlong Yang
QZ
Qinghe Zhao
LY
Luyi Yang
HT
Hanting Tang
CL
Chaokun Liu
HC
Haibiao Chen
YL
Yuan Lin
FP
Feng Pan