W-Cu-Co single-atom oxides embedded in binary transition metal oxides for electrocatalytic oxygen evolution and photocatalytic norfloxacin degradation: Dual-functional catalysts
Journal of Energy Storage
Optimizing electronic structures and incorporating additional active sites in metal oxides can significantly enhance the performance of the oxygen evolution reaction (OER), which is a pivotal process in electrocatalysis. This study outlines a novel technique that incorporates single-atom oxides of tungsten (W), cobalt (Co), and copper (Cu) into Co3O4 nanoflakes, MnO2 nanorods, and reduced graphene oxide (rGO) to fabricate WCC-CoMn-R nanocomposites using sonication. Incorporating SMAO in various oxidation states is expected to enhance nanoscale interfaces, thereby improving the synergistic effects and catalytic performance of the material. The WCC-CoMn-R-3 nanocomposites achieved low overpotentials of 286 and 350 mV, respectively, and demonstrated outstanding OER performance at current densities of 10 and 100 mA cm−2. Furthermore, they showed exceptional stability, continuing to function after 24 h of chronoamperometry and 3000 cycles of cyclic voltammetry. The WCC-CoMn-R-3 catalyst also demonstrated superior photocatalytic performance, degrading norfloxacin (NF) to the extent of 96.36 % in 60 min. This degradation was primarily facilitated by hydroxyl (HO•) and superoxide (O2•-) radicals. The distinct oxidation states of individual W, Cu, and Co atoms, the high density of Co 2p and Mn 2p ions, and the favorable chemical composition of rGO-Co3O4-MnO2 are responsible for its superior performance with SMAO. An inventive framework for developing and improving complex multicomponent composite catalysts with heterointerfaces and single metal atom oxides is presented in this work, offering potential applications in the electrocatalytic and photocatalytic domains.
Optimizing electronic structures and incorporating additional active sites in metal oxides can significantly enhance the performance of the oxygen evolution reaction (OER), which is a pivotal…
First-principles calculations were performed to analyze the effects of oxygen vacancies (Vo) and the combined effect of Vo and copper doping on layered perovskites ACr2O7 (A = Be, Mg, Ca…
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