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Insights into the role of CuO in the CO 2 photoreduction process.

Scientific Reports 2019 Februrary 5
The CO2 photoreduction process to produce light hydrocarbons is known to be influenced by the presence of CuO nanoparticles, but the actual role of this material, whether as a catalyst or a reactant, has not yet been revealed. In this work, we investigate the role of CuO nanoparticles produced by a solvothermal method as a catalyst in CO2 -saturated water reaction media under UV light, considering the effects of different electrolytes (Na2 C2 O4 , KBrO3 , and NaOH) and temperatures on nanoparticle phase and activity. The electrolyte strongly influenced product selectivity (NaOH led to evolution of CH4 , Na2 C2 O4 to CO, and KBrO3 to O2 ) and induced CuO phase change. A long-term analysis of these processes indicated that during the initial steps, CuO acted as a reactant, rather than as a catalyst, and was converted to CuCO3 .Cu(OH)2 , while the as-converted material acted as a catalyst in CO2 photoreduction, with conversion values comparable to those reported in the literature.

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