Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 15, Issue 16, Pages 20100-20109Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.3c00544
Keywords
Lattice strain; in situ Raman spectroscopy; reversible reconstruction; intermittent oxygen evolution; amorphous cobalt oxide
Ask authors/readers for more resources
This article investigates the heterogeneous interface of CoMoO4 center dot 0.69H2O/Co3O4 for oxygen evolution reaction (OER) and finds that the chemically inert Co3O4 support enables the retention of lattice strain in CoMoO4 center dot 0.69H2O, leading to dominant catalytic activity of the reconstructed CoOOH. In situ Raman spectroscopy confirms reversible conversion between active CoOOH and amorphous cobalt oxide during OER with favorable strain, resulting in superior durability and negligible decay after 10 cycles.
A heterogeneous interface usually plays a versatile role in modulating catalysis and the durability of hybrid electrocatalysts for oxygen evolution reaction (OER), and its intrinsic mechanism is still in dispute due to an uncertain correlation of initial, intermediate and active phases. In this article, the CoMoO4 center dot 0.69H2O/Co3O4 heterogeneous interface is configured to understand the evolution kinetics of these correlated phases. Due to the chemically and electrochemically inert character of Co3O4 support, lattice strain with 3.31% tuning magnitude in primary CoMoO4 center dot 0.69H2O can be inherited after spontaneous dissolution of molybdenum cations in electrolyte, dominating catalytic activity of the reconstructed CoOOH. In situ Raman spectroscopy demonstrates reversible conversion between active CoOOH and amorphous cobalt oxide during OER when positive and negative potentials are sequentially supplied onto hybrid catalysts with favorable strain. Therefore, superior durability with negligible decay after 10 cycles is experimentally identified for intermittent oxygen evolution. Theoretical calculations indicate that appropriate stress within the electrocatalyst could reduce the reaction energy barrier and enhance the OER performance by optimizing the adsorption of intermediates.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available