Effects of pH variation in aqueous solutions on dissolution of copper oxide

Ko, Cheon Kwang; Lee, Won Gyu

doi:10.1002/sia.3238

Cited by 33 publications

(17 citation statements)

References 15 publications

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“…20,38 Dissolution of metallic copper (0) and oxides is feasible in inorganic acids such as HNO 3 , 20 HCl, H 2 SO 4 , 20,39 or organic acids such as citric acid. 40,41 1 2…”

Section: Resultsmentioning

confidence: 99%

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Acid dissolution of copper oxides as a method for the activation of Cu(0) wire catalyst for SET‐LRP

Nguyen

Percéc

2011

J. Polym. Sci. A Polym. Chem.

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Here we reported the acid dissolution of copper oxides as a methodology for the activation of Cu(0) wire used as catalyst in single‐electron transfer living radical polymerization (SET‐LRP). In this method, the oxide layer on the surface of commercial Cu(0) wire was removed by dissolution in a concentrated acid such as nitric acid, glacial acetic acid and hydrochloric acid. SET‐LRP of methyl acrylate catalyzed with Cu(0) wire activated with acids showed comparable k pitalicapp value to that of the nonactivated Cu(0) wire‐catalyzed counterpart. However, the polymerizations catalyzed with activated Cu(0) wire proceeded with no initial induction period, predictable molecular weight evolution with conversion, and narrow molecular weight distribution. Regardless of the activation method, the chain end functionality of α,ω‐di(bromo) poly(methyl acrylate) (PMA) prepared from SET‐LRP initiated with a bifunctional initiator is extremely high, maintaining a 100% chain end functionality at ∼90% monomer conversion. The degree of bimolecular termination increased as the polymerization exceeds 92% conversion. However, for binfunctional initiators this small amount of bimolecular termination at high conversion maintains a perfectly bifunctional polymer. Structural analysis by MALDI‐TOF upon thioetherification of α,ω‐di(bromo) PMA with thiophenol and 4‐fluorothiophenol confirmed the high fidelity of bromide chain ends. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011

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“…20,38 Dissolution of metallic copper (0) and oxides is feasible in inorganic acids such as HNO 3 , 20 HCl, H 2 SO 4 , 20,39 or organic acids such as citric acid. 40,41 1 2…”

Section: Resultsmentioning

confidence: 99%

“…In the presence of dissolved oxygen in the acid solution, metallic copper can also be solubilized (eq 3). 20, 38 Dissolution of metallic copper (0) and oxides is feasible in inorganic acids such as HNO 3 ,20 HCl, H 2 SO 4 ,20, 39 or organic acids such as citric acid 40, 41 …”

Section: Resultsmentioning

confidence: 99%

Acid dissolution of copper oxides as a method for the activation of Cu(0) wire catalyst for SET‐LRP

Nguyen

Percéc

2011

J. Polym. Sci. A Polym. Chem.

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“…24,25,37 Under the electrolytic conditions, the reduction of Cu 2 O to metallic Cu can be suppressed. 14,38,39 Recent literature suggested that Cu 2 O shows prominent stability even after applying the cathodic potential in alkaline media for oxygen reduction reaction. 40,41 As a result, the uniquely structured Cu 2 O electrodes lead to selective C 2 H 4 formation -but not CH 4 formation -and the structure is maintained during CO 2 electrolysis owing to the hydroxide molecules (eqn (1)-( 3)) promoting the locally alkaline state.…”

Section: Pccp Papermentioning

confidence: 99%

Insights into an autonomously formed oxygen-evacuated Cu₂O electrode for the selective production of C₂H₄ from CO₂

Kim

Lee

Ocon

et al. 2015

Phys. Chem. Chem. Phys.

215

211

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Electrochemical conversion of carbon dioxide (CO2) to small organic fuels (e.g. formate, methanol, ethylene, ethanol) is touted as one of the most promising approaches for solving the problems of climate change and energy security. In this study, we report the highly efficient electrochemical reduction of CO2 using cuprous oxide (Cu2O) electrodes to produce ethylene (C2H4) primarily. During CO2 electrolysis using electrodeposited Cu2O on a carbon electrode, we observe the transformation of a compact metal oxide layer to a metal oxide structure with oxygen vacant sites at the bulk region. In contrast to previous studies, our results clearly indicate that Cu2O remains at the surface of the catalyst and it efficiently catalyzes the conversion process of CO2 at low overpotential, exhibiting a high selective faradaic efficiency of over 20% towards C2H4 formation even in long-term electrolysis.

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“…A factor in the performance of Cu2O during CO2 electrolysis is believed to originate from the hydroxide ions (OH -) that are generated during CO2RR at the electrode surface. The rise of local pH close to the surface layer has been reported to limit the reduction of Cu2O to metallic Cu at the electrolyte interface, which assists in the continuous generation of C2H4 [46].…”

Section: Resultsmentioning

confidence: 99%

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Khan

Sugiyama

Fujii

et al. 2020

Asian J. Nanosci. Mater.

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Electrochemical reduction of CO2 is so important in mitigating the greenhouse related environmental concerns. Recently, oxidized forms of metals instead of pure metals have gained a great deal of attention due to the difference in product selection between the two classes of electrode materials. Since copper has been widely used in producing carbon-intensive products, various studies have been dedicated to evaluate its oxidized form. In this research study, we focused on using cuprous oxide particles supported on hydrophobic carbon paper substrate. The structure of the carbon paper provides unique reaction sites while the micron-sized particles can help to provide new insight about using smaller surface area to volume ratio as compared to previous reports on oxidized copper nanoparticles. Formic acid, ethylene, and CO were produced as a result of our experiments which show improved product selection compared with the pure copper nanoparticles. The potential and time dependence of these products are presented in this study along with a discussion on the origin of CO2 reduction.

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Effects of pH variation in aqueous solutions on dissolution of copper oxide

Cited by 33 publications

References 15 publications

Acid dissolution of copper oxides as a method for the activation of Cu(0) wire catalyst for SET‐LRP

Acid dissolution of copper oxides as a method for the activation of Cu(0) wire catalyst for SET‐LRP

Insights into an autonomously formed oxygen-evacuated Cu₂O electrode for the selective production of C₂H₄ from CO₂

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Effects of pH variation in aqueous solutions on dissolution of copper oxide

Cited by 33 publications

References 15 publications

Acid dissolution of copper oxides as a method for the activation of Cu(0) wire catalyst for SET‐LRP

Acid dissolution of copper oxides as a method for the activation of Cu(0) wire catalyst for SET‐LRP

Insights into an autonomously formed oxygen-evacuated Cu2O electrode for the selective production of C2H4 from CO2

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Insights into an autonomously formed oxygen-evacuated Cu₂O electrode for the selective production of C₂H₄ from CO₂