Methane synthesis from CO2 and H2O with electricity using H-permeable membrane electrochemical cells with Ru catalyst and phosphate electrolyte

2021 ◽  
Vol 5 (4) ◽  
pp. 935-940
Author(s):  
Jun Kubota ◽  
Takaya Okumura
Keyword(s):  
Current Efficiency ◽  
Electrochemical Cells ◽  
Permeable Membrane ◽  
Ru Catalyst ◽  
Electrochemical Conversion ◽  
A Current ◽  
Phosphate Electrolyte

Direct electrochemical conversion of CO2 and H2O to CH4 in a combined Ru-catalyst and H2O electrolyzer system was examined at 270 °C, thus obtaining a current efficiency of 93% for CH4 formation.

Dramatic efficiency improvement in single-layer orange phosphorescent organic light-emitting devices with suppressed efficiency roll-off

RSC Advances ◽  
2016 ◽  
Vol 6 (60) ◽  
pp. 55017-55021 ◽  
Author(s):  
Liangmei Zuo ◽  
Guangguang Han ◽  
Ren Sheng ◽  
Kaiwen Xue ◽  
Yu Duan ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Single Layer ◽  
Efficiency Improvement ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices ◽  
A Current

We have successfully demonstrated efficient single-layer organic light-emitting devices (OLEDs) with a current efficiency of 31.38 cd A−1.

Preliminary Studies of the Obtaining of Solid Metallic Cerium from Fluoride Melts

2003 ◽  
Vol 58 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Virgil Constantin ◽  
Ana-Maria Popescu ◽  
Stefania Zuca
Keyword(s):  
Current Efficiency ◽  
Molten Salt ◽  
Molten Salt Electrolysis ◽  
Temperature Range ◽  
Cubic Form ◽  
Fluoride Melts ◽  
Molten Electrolyte ◽  
A Current ◽  
Decomposition Potential

The present study deals with the obtaining of solid cerium by molten salt electrolysis of a 46.74 - 48.26 - 5wt% LiF-NaF-NaCeF4 mixture, in the temperature range 700 - 730 °C and with a current efficiency of ~ 75%. For this purpose NaCeF4 was obtained, characterized and it’s cubic form was identified. The solubility and decomposition potential of this compound in the molten electrolyte 49.2 - 50.8% LiF-NaF was also studied.

The coulometric titration of the derivatives of N,N-dimethyl-4-aminoazobenzene by generated trivalent titanium

1990 ◽  
Vol 55 (2) ◽  
pp. 391-402 ◽  
Author(s):  
Jiří Barek ◽  
Helena Kvapilová ◽  
Tibor Pastor ◽  
Jiří Zima
Keyword(s):  
Current Efficiency ◽  
Electrochemical Behaviour ◽  
Coulometric Titration ◽  
Acetic Acid Solution ◽  
Mercury Electrode ◽  
System A ◽  
Current Density Range ◽  
Derivatives Of ◽  
Trivalent Titanium ◽  
A Current

Conditions for the coulometric generation of titanium(III) ions in buffer medium in the presence of sodium citrate were found on the basis of a study of the electrochemical behaviour of the Ti(III)/Ti(IV) system. A current efficiency of 100% was attained in acetic acid solution (c = 1 mol l-1) containing citric acid (c = 0.2 mol l-1) and titanium (IV) chloride (c = 0.1 mol l-1), with pH adjusted to 6 using sodium hydroxide, in the current density range 0.5 to 10 mA/cm2 using a mercury electrode and 1 to 2 mA/ cm2 using a paraffin-impregnated spectrographic carbon electrode. It was found that methanol does not affect the current efficiency at contents of up to 33% (v/v) and conditions were found for the coulometric titration of small amounts (0.2-2 mg) of some genotoxic derivatives of N,N-dimethyl-4-aminoazobenzene.

scholarly journals Electrocatalytic Study of Carbon Dioxide Reduction By Co(TPP)Cl Complex

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Khalaf Alenezi
Keyword(s):  
Carbon Dioxide ◽  
Global Warming ◽  
Current Efficiency ◽  
Carbon Dioxide Reduction ◽  
Research Topic ◽  
Carbon Electrode ◽  
Electrocatalytic Reduction ◽  
Carbon Reduction ◽  
P Type ◽  
A Current

Carbon dioxide (CO2) is notorious for being a greenhouse gas and is the most important cause of global warming. However, it can be converted into useful products as it is a source of carbon. Reduction of CO2is therefore an attractive research topic for many chemists. Different methods of electrocatalytic reduction of CO2have been reported previously. Since CO2is very stable, the direct electroreduction of CO2into CO requires high potential at −2.2 V versus Ag/AgCl. In this work, CO2reduction was carried out by the photoelectrocatalysis of CO2in the presence of cobalt(III)tetraphenylporphyrin [Co(TPP)Cl] at −1.85 V with a current efficiency of 71%. At illuminated p-type silicon photocathode, the reduction of CO2into CO was performed at a potential of 300 mV which is positive. However, at the same conditions, potential of −1.55 V with a current efficiency ofca65% is required for the carbon electrode.

Preparation of CMC-PVA/PAN-FePc(COOH)8/CS-PVA Bipolar Membrane and its Application in Electro-Oxidized Synthesis of Dialdehydle Starch

2015 ◽  
Vol 1120-1121 ◽  
pp. 141-147
Author(s):  
Zhong Gui Li ◽  
Ting Jin Zhou ◽  
Ri Yao Chen ◽  
Xiao Chen ◽  
Xi Zheng ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Current Efficiency ◽  
Current Density ◽  
Cell Voltage ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Experimental Results ◽  
Bipolar Membrane ◽  
Electrospinning Technique ◽  
A Current

The polyacrylonitrile (PAN)-iron octocarboxyphthalocyanine (FePc(COOH)8) nanofibers were prepared using electrospinning technique and introduced into the interlayer of a carboxymethyl cellulose (CMC)-polyvinyl alcohol (PVA)/chitosan (CS)-polyvinyl alcohol bipolar membrane (BPM), which was characterized using SEM, contact angle measurement, current-voltage characteristics, AC impedance spectroscopy and so on. The experimental results showed that after modification by PAN-FePc(COOH)8 nanofibers, the membrane impedance of the BPM and its cell voltage were decreased. That indicated that the water splitting efficiency in the interlayer of the BPM was increased. Then the prepared CMC-PVA/PAN-FePc(COOH)8/CS-PVA BPM was used in the electro-oxidized preparation of dialdehydle starch (DAS). The experimental results indicated that a current density of 20mA·cm-2 was suitable to obtain high current efficiency. When the electrolysis time was 3h at a current density of 20 mA·cm-2 , the current efficiency of the CMC-PVA/PAN-FePc(COOH)8/CS-PVA BPM-equipped cell was as high as 67%.

Syntheses, photoluminescence and electroluminescence of two novel platinum(ii) complexes

2017 ◽  
Vol 46 (1) ◽  
pp. 150-157 ◽  
Author(s):  
Guang-Zhao Lu ◽  
Yan Li ◽  
Yi-Ming Jing ◽  
You-Xuan Zheng
Keyword(s):  
Current Efficiency ◽  
Platinum Complexes ◽  
Peak Current ◽  
Highly Efficient ◽  
Low Efficiency ◽  
A Current

Highly efficient green OLEDs based on two platinum complexes showed a peak current efficiency of 48.3 cd A−1 with low efficiency roll-off; and even at a brightness of 1000 cd m−2, a current efficiency of 47.0 cd A−1 could still be obtained.

scholarly journals A Study of Precision Current Efficiency Curve Measurement with a Casing-Type Anode

2021 ◽  
Vol 11 (4) ◽  
pp. 1425
Author(s):  
Hao Wang ◽  
Jia Liu ◽  
Di Zhu
Keyword(s):  
Current Efficiency ◽  
Measurement Errors ◽  
Electrochemical Machining ◽  
Machining Process ◽  
Aviation Industry ◽  
Efficiency Curve ◽  
Type Method ◽  
Shape Prediction ◽  
Faraday’S Law ◽  
A Current

Electrochemical machining (ECM) is a non-traditional machining technology that is widely used in the manufacturing of key components in the aviation industry. The current efficiency is defined as the ratio of the observed amount of dissolved metal to the theoretical amount predicted from Faraday’s law. In ECM, the current efficiency curve relates the dissolution rate of the anode material and the current density. Accurate measurement of the current efficiency curve is the basis for anode shape prediction and cathode tool design. However, in conventional measurement methods, the phenomenon of edge stray corrosion introduces significant measurement errors. Improving the current efficiency is thus a challenging task for any electrophysical or electrochemical machining process. To improve the measurement accuracy, this paper proposes a current efficiency curve measurement with a casing-type anode. In the proposed measurement method, the anode is designed in two parts: the mandril and the casing. The edge stray corrosion effect is mainly concentrated on the casing, and only the current distribution on the mandril is considered in the calculation of current efficiency. The measurement simulations of the conventional and the proposed methods were carried out. The simulation results show that the casing-type method significantly improves the accuracy of current efficiency measurements, and the current efficiency curve of 304SS was obtained.

Electrochemical Cocrystallization Experiments with Gd2Cl3

1992 ◽  
Vol 47 (7) ◽  
pp. 992-994 ◽  
Author(s):  
N. B. Mikheev ◽  
A. N. Kamenskaya ◽  
I. A. Rumer ◽  
V. L. Novitschenko ◽  
A. Simon ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Rare Earths ◽  
Oxidation Potential ◽  
A Current

Gd2Cl3 is electrocrystallized from molten GdCl3 at 900 K with a current efficiency of 70% referring to the reaction 2GdCl3+3e⁻=Gd2Cl3+3Cl-. The reaction is used to determine cocrystallization coefficients for trivalent rare earths and actinoids (Y, Nd, Cm, Pu), divalent lanthanoids (Eu, Yb), and Sr. The oxidation potential for the above reaction is determined as 2.65 ≤ E° ≤ 2.68 V.

Influence of Si on the Electrochemical Performance of Al-Zn-In-Mg-Ti Sacrificial Anode Alloy

2010 ◽  
Vol 146-147 ◽  
pp. 691-695 ◽  
Author(s):  
Jiu Ba Wen ◽  
Jun Guang He ◽  
Xian Wen Lu
Keyword(s):  
Electrochemical Performance ◽  
Current Efficiency ◽  
Harmful Effect ◽  
Uniform Corrosion ◽  
Ti Alloy ◽  
Sacrificial Anode ◽  
Corrosion Morphology ◽  
Metallographic Method ◽  
Si Content ◽  
A Current

The effects of Si content on the electrochemical performance of Al-5Zn-0.03In-1Mg- 0.05Ti (wt.%) alloy were studied by the electrochemical measurements and metallographic method. The optimal microstructures and electrochemical performance were obtained when the Si content in Al-Zn-In-Mg-Ti alloy was 0.1 wt.%. This anode alloy shows a current efficiency of 94.3% with even corrosion. However, in the case of Si content over 0.1 wt.%, the electrochemical performance of aluminum sacrificial anode shows only a nil improvement, and the corrosion morphology becomes uneven. The results reveal that the appropriate amount of Si is effective on reducing the harmful effect of iron impurities, improving the non-uniform corrosion and the electrochemistry performance of Al-Zn-In-Mg-Ti alloy.

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