Electric reduction reaction of CO2 (CO2RR) to a higher value of C2+ (C ≥ 2) Products such as C2NSFour Provides environment-friendly technology for the recycling of carbon resources, but with higher value C activity and selectivity2+ (C ≥ 2) The product is severely limited by the multi-electron transfer process and the slow CC coupling step at a single active site.
In a study published in Angewandte Chemie International Edition, Professor Cao Rong and Professor Huang Yuanbiao of the Fujian Institute for Material Structure (FJIRSM) of the Chinese Academy of Sciences (CAS) have developed an effective tandem catalytic strategy to improve CO selectivity.2RR to C2NSFour By several different catalyst sites near the local.
Researchers have found that Earth-rich elements by uniformly dispersing Cu nanoparticles (NPs) on an atomically separated nickel-nitrogen site (PTF (Ni))-fixed porphyrintriazine framework. We constructed a base tandem electrode catalyst PTF (Ni) / Cu.
Faraday efficiency of C2NSFour Reversible hydrogen electrode (RHE), which is about 6 times higher than non-tandem catalyst PTF / Cu (metal-free fixed porphyrin triazine framework), reaches 57.3% at -1.1 V, which exceeds most catalysts. .. PTF (Ni) / Cu shows good stability in continuous production of C2NSFour 11 hours or more electrolytic As evidenced by almost unchanged total current density and FEC2H4.. The electrical reduction of CO (CORR) in PTF (Ni) / Cu and PTF / Cu proved the importance of in-situ CO produced by atomically separated nickel-nitrogen sites. This allows fast movement to a nearby CuNP for the next CC coupling. Reaction to form C2NSFour..
In addition, the operand ATR-FTIR and density functional theory (DFT) calculations show that high concentrations of local CO on the Cu site increase the * CO intermediate coverage of the Cu surface, improve the CC binding probability, and increase the probability of C binding. It became clear that the formation improved.2NSFourOn the other hand, low CO concentration was favorable for CH formationFour..
This study proposed a simple and general synthetic strategy for designing tandem catalysts based on the active site of a single atom. This can guide the subsequent design of next-generation high-efficiency CO.2RR catalyst for multi-carbon products.
Jun-Dong Yi et al, Conductive 2D Phthalocyanine-Based Metallic Organic Framework Nanosheets for Efficient Electric Reduction of CO2, Angewandte Chemie International Edition (2021). DOI: 10.1002 / anie.202104564
Chinese Academy of Sciences
Quote: Nickel single atoms and copper nanoparticles (2021, October 28) used for highly selective tandem electrode catalysis of CO2 on ethylene are available at https://phys.org/news/2021-10. Obtained from -nickel-atom-copper-nanoparticles- on October 28, 2021. high.html
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Nickel single atom and copper nanoparticles used for highly selective tandem electrode catalysis of CO2 on ethylene
https://phys.org/news/2021-10-nickel-atom-copper-nanoparticles-highly.html Nickel single atom and copper nanoparticles used for highly selective tandem electrode catalysis of CO2 on ethylene