scholarly journals Electrocatalytic CO2 reduction with a membrane supported manganese catalyst in aqueous solution

2014 ◽  
Vol 50 (84) ◽  
pp. 12698-12701 ◽  
Author(s):  
James J. Walsh ◽  
Gaia Neri ◽  
Charlotte L. Smith ◽  
Alexander J. Cowan
Keyword(s):  
Aqueous Solution ◽  
Aqueous Electrolyte ◽  
Co2 Reduction ◽  
Nafion Membranes

[Mn(bpy)(CO)3Br]/MWCNT/Nafion membranes are active heterogeneous electrocatalysts for CO2 reduction to CO in aqueous electrolyte at relatively low overpotentials.

Rationally designed CdS/Ti3C2 MXene electrocatalysts for efficient CO2 reduction in aqueous electrolyte

2021 ◽  
Author(s):  
Yuwei Wang ◽  
Rong Du ◽  
Zhuo Li ◽  
Haoran Song ◽  
Zhe Chao ◽  
...  
Keyword(s):  
Aqueous Electrolyte ◽  
Co2 Reduction

Photocatalytic CO2 reduction using water as an electron donor by a powdered Z-scheme system consisting of metal sulfide and an RGO–TiO2 composite

2017 ◽  
Vol 198 ◽  
pp. 397-407 ◽  
Author(s):  
Tomoaki Takayama ◽  
Ko Sato ◽  
Takehiro Fujimura ◽  
Yuki Kojima ◽  
Akihide Iwase ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Visible Light ◽  
Water Splitting ◽  
Electron Donor ◽  
Visible Light Irradiation ◽  
Co2 Reduction ◽  
Metal Sulfide ◽  
Electron Donors ◽  
Reduced Graphene

CuGaS2, (AgInS2)x–(ZnS)2−2x, Ag2ZnGeS4, Ni- or Pb-doped ZnS, (ZnS)0.9–(CuCl)0.1, and ZnGa0.5In1.5S4 showed activities for CO2 reduction to form CO and/or HCOOH in an aqueous solution containing K2SO3 and Na2S as electron donors under visible light irradiation. Among them, CuGaS2 and Ni-doped ZnS photocatalysts showed relatively high activities for CO and HCOOH formation, respectively. CuGaS2 was applied in a powdered Z-scheme system combining with reduced graphene oxide (RGO)-incorporated TiO2 as an O2-evolving photocatalyst. The powdered Z-scheme system produced CO from CO2 in addition to H2 and O2 due to water splitting. Oxygen evolution with an almost stoichiometric amount indicates that water was consumed as an electron donor in the Z-schematic CO2 reduction. Thus, we successfully demonstrated CO2 reduction of artificial photosynthesis using a simple Z-scheme system in which two kinds of photocatalyst powders (CuGaS2 and an RGO–TiO2 composite) were only dispersed in water under 1 atm of CO2.

Square-Wave Voltammetry of Decamethylferrocene at the Three-Phase Junction Organic Liquid/Aqueous Solution/Graphite

2001 ◽  
Vol 66 (3) ◽  
pp. 434-444 ◽  
Author(s):  
Šebojka Komorsky-Lovrić ◽  
Milivoj Lovrić ◽  
Fritz Scholz
Keyword(s):  
Aqueous Solution ◽  
Linear Relationship ◽  
Square Wave Voltammetry ◽  
Aqueous Electrolyte ◽  
Graphite Electrode ◽  
Organic Liquid ◽  
Aqueous Electrolytes ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Three Phase

Drops of nitrobenzene and 1,2-dichloroethane with 0.1 M decamethylferrocene (dmfc) are attached to the surface of a paraffin-impregnated graphite electrode and immersed into various aqueous electrolytes. The oxidation of dmfc and the reduction of dmfc+ cation are enabled by simultaneous transfers of anions between the aqueous electrolyte and the organic solvents. Square-wave voltammetry of this reaction is reported. A linear relationship was observed between the peak potentials of dmfc and the standard Galvani potential differences of the anions. The influence of the anion concentration on this relation is explained.

Electrochemical CO2 Reduction to Hydrocarbons on a Heterogeneous Molecular Cu Catalyst in Aqueous Solution

2016 ◽  
Vol 138 (26) ◽  
pp. 8076-8079 ◽  
Author(s):  
Zhe Weng ◽  
Jianbing Jiang ◽  
Yueshen Wu ◽  
Zishan Wu ◽  
Xiaoting Guo ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Co2 Reduction ◽  
Electrochemical Co2 Reduction ◽  
Cu Catalyst

Specific counter-cation effect on the molecular orientation of thiocyanate anions at the aqueous solution interface

2020 ◽  
Vol 22 (18) ◽  
pp. 10106-10115
Author(s):  
Hongxing Hao ◽  
Qing Xie ◽  
Jingwen Ai ◽  
Yuan Wang ◽  
Hongtao Bian
Keyword(s):  
Aqueous Solution ◽  
Atmospheric Aerosols ◽  
Molecular Orientation ◽  
Aqueous Electrolyte ◽  
Electrolyte Solutions ◽  
Interfacial Structure ◽  
Cation Effect ◽  
Solution Interface ◽  
Wide Range ◽  
Counter Cation

Understanding the interfacial structure of aqueous electrolyte solutions is important and relevant to a wide range of systems, ranging from atmospheric aerosols to electrochemistry, and biological environments.

scholarly journals Modification of Nafion Membranes by IL-Cation Exchange: Chemical Surface, Electrical and Interfacial Study

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
V. Romero ◽  
M. V. Martínez de Yuso ◽  
A. Arango ◽  
E. Rodríguez-Castellón ◽  
J. Benavente
Keyword(s):  
Aqueous Solution ◽  
Impedance Spectroscopy ◽  
Cation Exchange ◽  
Photoelectron Spectroscopy ◽  
Electrical Characterization ◽  
Proton Exchange ◽  
Supplementary Information ◽  
Membrane Thickness ◽  
Scanning Calorimetry ◽  
Nafion Membranes

Bulk and surface changes in two proton-exchange membranes (Nafion-112 and Nafion-117) as a result of the incorporation of the IL-cationn-dodecyltriethylammonium (or DTA+) by a proton/cation exchange mechanism after immersion in a DTA+aqueous solution were analysed by impedance spectroscopy (IS), differential scanning calorimetry (DSC), X-ray photoelectron spectroscopy (XPS), and contact angle measurements performed with dry samples of the original Nafion and Nafion-DTA+-modified membranes. Only slight differences were obtained in the incorporation degree and surface chemical nature depending on the membrane thickness, and DTA+incorporation modified both the hydrophobic character of the original Nafion membranes and their thermal stability. Electrical characterization of the dry Nafion-112 membrane was performed by impedance spectroscopy while different HCl solutions were used for membrane potential measurements. A study of time evolution of the impedance curves measured in the system “IL aqueous solution/Nafion-112 membrane/IL aqueous solution” was also performed. This study allows us monitoring the electrical changes associated to the IL-cation incorporation in both the membrane and the membrane/IL solution interface, and it provides supplementary information on the characteristic of the Nafion/DTA+hybrid material. Moreover, the results also show the significant effect of water on the electrical resistance of the Nafion-112/IL-cation-modified membrane.

The Temperature Dependence of the Electrical Conductivity Activation Energy of the of Aqueous Electrolyte Solutions

2021 ◽  
Vol 1031 ◽  
pp. 228-233
Author(s):  
Yuliya M. Artemkina ◽  
Vladimir V. Shcherbakov ◽  
Irina A. Akimova
Keyword(s):  
Activation Energy ◽  
Aqueous Solution ◽  
Temperature Dependence ◽  
Aqueous Electrolyte ◽  
Electrolyte Solutions ◽  
Temperature Step ◽  
Conductivity Activation Energy ◽  
Intermolecular Hydrogen Bonds ◽  
Optimal Value ◽  
Increasing Temperature

The procedure for determining the activation energy of conductivity Еκ is analyzed depending on the temperature step ΔT. It is shown that with increasing ΔT, the error in the calculation of Eκ decreases, but the calculated value of Eκ decreases. In order not to lose the temperature dependence of the activation energy, it is necessary to choose the optimal value of Δt. In our opinion, this value should not exceed 5 – 10 °C. Taking into account the decrease in concentration with increasing temperature due to a decrease in density has virtually no effect on the accuracy of determining Eκ, provided that ΔT is 5 – 10 °C. It has been shown that in the temperature range 20 – 80 °C, the activation energy of conductivity decreases with increasing temperature. This decrease is due to the rupture of intermolecular hydrogen bonds of the solvent with increasing temperature. It was suggested that the movement of ions in an aqueous solution may be accompanied by the breaking of hydrogen bond of the solvent.

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