The Experts below are selected from a list of 271914 Experts worldwide ranked by ideXlab platform
Enn Lust - One of the best experts on this subject based on the ideXlab platform.
-
the electrochemical characteristics of the mixture of 1 ethyl 3 methylimidazolium tetrafluoroborate and 1 ethyl 3 methylimidazolium iodide
Journal of Electroanalytical Chemistry, 2014Co-Authors: Carolin Siimenson, Liis Siinor, K Lust, Enn LustAbstract:Abstract The electrochemical behavior and characteristics of the interface between Bi(1 1 1) and 1-Ethyl-3-Methylimidazolium iodide solution in 1-Ethyl-3-Methylimidazolium tetrafluoroborate with variable concentrations were investigated by using cyclic voltammetry and electrochemical impedance spectroscopy. The shape of the complex impedance plane plots, the values of the phase angle and capacitance depend strongly on the concentration of EMImI in the mixture of ionic liquids, on ac frequency and on the electrode potential applied. The capacitance values increase considerably at potentials higher than −0.6 V vs. Ag|AgCl| mixture of RTIL, were the specific adsorption of iodide ions takes place. Comparison of the data for the Bi(1 1 1) electrode and the highly oriented pyrolytic graphite C(0 0 0 1) shows that the chemical nature and the crystallographic structure of an electrode significantly influence the specific adsorption of the halide ions. The non-linear least squares fitting method has been applied for calculation of equivalent circuit parameters for Bi(1 1 1)|mixture of RTIL interface.
-
in situ stm studies of bi 111 1 ethyl 3 methylimidazolium tetrafluoroborate 1 ethyl 3 methylimidazolium iodide interface
Electrochemistry Communications, 2014Co-Authors: E Anderson, Liis Siinor, Carolin Siimenson, Vitali Grozovski, Enn LustAbstract:Formation of an interfacial structure at an electrochemically polished Bi(111) surface in 1 wt.% 1-Ethyl-3-Methylimidazolium iodide + 1-Ethyl-3-Methylimidazolium tetrafluoroborate ionic liquid mixture has been analysed using the high-resolution in situ electrochemical scanning tunneling microscopy, cyclic voltammetry and electrochemical impedance methods. At 22 ± 1 °C, a well-defined 2-dimensional superstructure has been demonstrated within the electrode potential (E) region from − 0.7 V to − 0.3 V (vs. Ag|AgCl in the same mixture of the ionic liquids), where a strong specific I− anion adsorption and coadsorption of counter-ions occurs. At E < − 0.8 V, the superstructure disappears as a result of desorption of the specifically adsorbed iodide anions from the Bi(111) surface. At E ≥ − 0.2 V, where Bi(111) surface oxidation process starts, the 2D-superstructure cannot be observed due to a quick atomic-scale roughening of the Bi(111) plane.
-
electrochemical characteristics pyrolytic graphite mixture of 1 ethyl 3 methylimidazolium tetrafluoroborate and 1 ethyl 3 methylimidazolium iodide interface
Journal of Electroanalytical Chemistry, 2014Co-Authors: Liis Siinor, K Lust, Joosep Poom, Carolin Siimenson, Enn LustAbstract:Abstract The interface between pyrolytic graphite (PG) and the mixture of 1-Ethyl-3-Methylimidazolium tetrafluoroborate (EMImBF 4 ) and 1-Ethyl-3-Methylimidazolium iodide (EMImI) were electrochemically characterized by using cyclic voltammetry and electrochemical impedance spectroscopy. The addition of EMImI in EMImBF 4 influences the region of ideal polarizability and formation/rearrangement kinetics of the electrical double layer. The values of series and parallel capacitances, adsorption kinetics of ions and adsorption capacitance of the PG|EMImI + EMImBF 4 interface were obtained. The PG electrode in EMImBF 4 is ideally polarizable from −1.1 V to 1.3 V vs. Ag|AgCl. The mixture of ionic liquids was tested within wider potential region to see what happens at more positive potentials considering the possible specific adsorption of I − ions. The shape of the differential capacitance vs. potential curves depends strongly on the addition of EMImI, electrode potential and ac frequency. There are two capacitance maxima in the differential capacitance vs. potential curve. Based on the analysis of impedance data, the first capacitance maximum is mainly caused by the specific adsorption of iodide ions with the partial charge transfer from ions to the electrode surface and vice versa, while the second capacitance maximum has been assumed to be initiated by the faradic pseudocapacitive behavior at the PG|EMImI + EMImBF 4 interface.
-
mixture of 1 ethyl 3 methylimidazolium tetrafluoroborate and 1 ethyl 3 methylimidazolium iodide a new potential high capacitance electrolyte for edlcs
Electrochemistry Communications, 2013Co-Authors: Liis Siinor, K Lust, Carolin Siimenson, Enn LustAbstract:Abstract The electrochemical characteristics of the interface between Bi(111) and the mixture of 1-Ethyl-3-Methylimidazolium tetrafluoroborate and 1-Ethyl-3-Methylimidazolium iodide were electrochemically characterized by using cyclic voltammetry and electrochemical impedance spectroscopy. The region of ideal polarizability, the formation/rearrangement kinetics of the electrical double layer, the values of series and parallel capacitance and the adsorption kinetics of ions depend on the addition of EMImI in the mixture. Based on the experimental data, it was found that the region of ideal polarizability of Bi(111) single crystal electrode in the mixture under study is comparable to the values measured in “pure” ionic liquids. Capacitance depends strongly on AC frequency and electrode potential, increasing considerably at E > − 0.7 V vs. Ag|AgCl, where the specific adsorption of iodide ions with partial charge transfer from ions to electrode surface and vice versa occurs.
-
electrical double layer capacitance at bi 111 1 ethyl 3 methylimidazolium tetrafluoroborate interface as a function of the electrode potential
Journal of The Electrochemical Society, 2010Co-Authors: Liis Siinor, K Lust, Enn LustAbstract:The influence of the electrode potential on the Bi(111) | 1-Ethyl-3-Methylimidazolium tetrafluoroborate interface has been studied by cyclic voltammetry and electrochemical impedance. The weak deviation of the system from capacitive behavior for the ideally flat electrode has been established within the moderate electrode potential region from -0.9 to -0.1 V vs Ag | AgCl in 1-Ethyl-3-Methylimidazolium tetrafluoroborate. The parallel faradaic processes are possible outside the potential region from -0.9 to -0.1 V. The results obtained for the Bi(111) | 1-Ethyl-3-Methylimidazolium tetrafluoroborate interface have been compared with those for gold, mercury, and glassy carbon electrodes.
Liis Siinor - One of the best experts on this subject based on the ideXlab platform.
-
the electrochemical characteristics of the mixture of 1 ethyl 3 methylimidazolium tetrafluoroborate and 1 ethyl 3 methylimidazolium iodide
Journal of Electroanalytical Chemistry, 2014Co-Authors: Carolin Siimenson, Liis Siinor, K Lust, Enn LustAbstract:Abstract The electrochemical behavior and characteristics of the interface between Bi(1 1 1) and 1-Ethyl-3-Methylimidazolium iodide solution in 1-Ethyl-3-Methylimidazolium tetrafluoroborate with variable concentrations were investigated by using cyclic voltammetry and electrochemical impedance spectroscopy. The shape of the complex impedance plane plots, the values of the phase angle and capacitance depend strongly on the concentration of EMImI in the mixture of ionic liquids, on ac frequency and on the electrode potential applied. The capacitance values increase considerably at potentials higher than −0.6 V vs. Ag|AgCl| mixture of RTIL, were the specific adsorption of iodide ions takes place. Comparison of the data for the Bi(1 1 1) electrode and the highly oriented pyrolytic graphite C(0 0 0 1) shows that the chemical nature and the crystallographic structure of an electrode significantly influence the specific adsorption of the halide ions. The non-linear least squares fitting method has been applied for calculation of equivalent circuit parameters for Bi(1 1 1)|mixture of RTIL interface.
-
in situ stm studies of bi 111 1 ethyl 3 methylimidazolium tetrafluoroborate 1 ethyl 3 methylimidazolium iodide interface
Electrochemistry Communications, 2014Co-Authors: E Anderson, Liis Siinor, Carolin Siimenson, Vitali Grozovski, Enn LustAbstract:Formation of an interfacial structure at an electrochemically polished Bi(111) surface in 1 wt.% 1-Ethyl-3-Methylimidazolium iodide + 1-Ethyl-3-Methylimidazolium tetrafluoroborate ionic liquid mixture has been analysed using the high-resolution in situ electrochemical scanning tunneling microscopy, cyclic voltammetry and electrochemical impedance methods. At 22 ± 1 °C, a well-defined 2-dimensional superstructure has been demonstrated within the electrode potential (E) region from − 0.7 V to − 0.3 V (vs. Ag|AgCl in the same mixture of the ionic liquids), where a strong specific I− anion adsorption and coadsorption of counter-ions occurs. At E < − 0.8 V, the superstructure disappears as a result of desorption of the specifically adsorbed iodide anions from the Bi(111) surface. At E ≥ − 0.2 V, where Bi(111) surface oxidation process starts, the 2D-superstructure cannot be observed due to a quick atomic-scale roughening of the Bi(111) plane.
-
electrochemical characteristics pyrolytic graphite mixture of 1 ethyl 3 methylimidazolium tetrafluoroborate and 1 ethyl 3 methylimidazolium iodide interface
Journal of Electroanalytical Chemistry, 2014Co-Authors: Liis Siinor, K Lust, Joosep Poom, Carolin Siimenson, Enn LustAbstract:Abstract The interface between pyrolytic graphite (PG) and the mixture of 1-Ethyl-3-Methylimidazolium tetrafluoroborate (EMImBF 4 ) and 1-Ethyl-3-Methylimidazolium iodide (EMImI) were electrochemically characterized by using cyclic voltammetry and electrochemical impedance spectroscopy. The addition of EMImI in EMImBF 4 influences the region of ideal polarizability and formation/rearrangement kinetics of the electrical double layer. The values of series and parallel capacitances, adsorption kinetics of ions and adsorption capacitance of the PG|EMImI + EMImBF 4 interface were obtained. The PG electrode in EMImBF 4 is ideally polarizable from −1.1 V to 1.3 V vs. Ag|AgCl. The mixture of ionic liquids was tested within wider potential region to see what happens at more positive potentials considering the possible specific adsorption of I − ions. The shape of the differential capacitance vs. potential curves depends strongly on the addition of EMImI, electrode potential and ac frequency. There are two capacitance maxima in the differential capacitance vs. potential curve. Based on the analysis of impedance data, the first capacitance maximum is mainly caused by the specific adsorption of iodide ions with the partial charge transfer from ions to the electrode surface and vice versa, while the second capacitance maximum has been assumed to be initiated by the faradic pseudocapacitive behavior at the PG|EMImI + EMImBF 4 interface.
-
mixture of 1 ethyl 3 methylimidazolium tetrafluoroborate and 1 ethyl 3 methylimidazolium iodide a new potential high capacitance electrolyte for edlcs
Electrochemistry Communications, 2013Co-Authors: Liis Siinor, K Lust, Carolin Siimenson, Enn LustAbstract:Abstract The electrochemical characteristics of the interface between Bi(111) and the mixture of 1-Ethyl-3-Methylimidazolium tetrafluoroborate and 1-Ethyl-3-Methylimidazolium iodide were electrochemically characterized by using cyclic voltammetry and electrochemical impedance spectroscopy. The region of ideal polarizability, the formation/rearrangement kinetics of the electrical double layer, the values of series and parallel capacitance and the adsorption kinetics of ions depend on the addition of EMImI in the mixture. Based on the experimental data, it was found that the region of ideal polarizability of Bi(111) single crystal electrode in the mixture under study is comparable to the values measured in “pure” ionic liquids. Capacitance depends strongly on AC frequency and electrode potential, increasing considerably at E > − 0.7 V vs. Ag|AgCl, where the specific adsorption of iodide ions with partial charge transfer from ions to electrode surface and vice versa occurs.
-
electrical double layer capacitance at bi 111 1 ethyl 3 methylimidazolium tetrafluoroborate interface as a function of the electrode potential
Journal of The Electrochemical Society, 2010Co-Authors: Liis Siinor, K Lust, Enn LustAbstract:The influence of the electrode potential on the Bi(111) | 1-Ethyl-3-Methylimidazolium tetrafluoroborate interface has been studied by cyclic voltammetry and electrochemical impedance. The weak deviation of the system from capacitive behavior for the ideally flat electrode has been established within the moderate electrode potential region from -0.9 to -0.1 V vs Ag | AgCl in 1-Ethyl-3-Methylimidazolium tetrafluoroborate. The parallel faradaic processes are possible outside the potential region from -0.9 to -0.1 V. The results obtained for the Bi(111) | 1-Ethyl-3-Methylimidazolium tetrafluoroborate interface have been compared with those for gold, mercury, and glassy carbon electrodes.
Carolin Siimenson - One of the best experts on this subject based on the ideXlab platform.
-
the electrochemical characteristics of the mixture of 1 ethyl 3 methylimidazolium tetrafluoroborate and 1 ethyl 3 methylimidazolium iodide
Journal of Electroanalytical Chemistry, 2014Co-Authors: Carolin Siimenson, Liis Siinor, K Lust, Enn LustAbstract:Abstract The electrochemical behavior and characteristics of the interface between Bi(1 1 1) and 1-Ethyl-3-Methylimidazolium iodide solution in 1-Ethyl-3-Methylimidazolium tetrafluoroborate with variable concentrations were investigated by using cyclic voltammetry and electrochemical impedance spectroscopy. The shape of the complex impedance plane plots, the values of the phase angle and capacitance depend strongly on the concentration of EMImI in the mixture of ionic liquids, on ac frequency and on the electrode potential applied. The capacitance values increase considerably at potentials higher than −0.6 V vs. Ag|AgCl| mixture of RTIL, were the specific adsorption of iodide ions takes place. Comparison of the data for the Bi(1 1 1) electrode and the highly oriented pyrolytic graphite C(0 0 0 1) shows that the chemical nature and the crystallographic structure of an electrode significantly influence the specific adsorption of the halide ions. The non-linear least squares fitting method has been applied for calculation of equivalent circuit parameters for Bi(1 1 1)|mixture of RTIL interface.
-
in situ stm studies of bi 111 1 ethyl 3 methylimidazolium tetrafluoroborate 1 ethyl 3 methylimidazolium iodide interface
Electrochemistry Communications, 2014Co-Authors: E Anderson, Liis Siinor, Carolin Siimenson, Vitali Grozovski, Enn LustAbstract:Formation of an interfacial structure at an electrochemically polished Bi(111) surface in 1 wt.% 1-Ethyl-3-Methylimidazolium iodide + 1-Ethyl-3-Methylimidazolium tetrafluoroborate ionic liquid mixture has been analysed using the high-resolution in situ electrochemical scanning tunneling microscopy, cyclic voltammetry and electrochemical impedance methods. At 22 ± 1 °C, a well-defined 2-dimensional superstructure has been demonstrated within the electrode potential (E) region from − 0.7 V to − 0.3 V (vs. Ag|AgCl in the same mixture of the ionic liquids), where a strong specific I− anion adsorption and coadsorption of counter-ions occurs. At E < − 0.8 V, the superstructure disappears as a result of desorption of the specifically adsorbed iodide anions from the Bi(111) surface. At E ≥ − 0.2 V, where Bi(111) surface oxidation process starts, the 2D-superstructure cannot be observed due to a quick atomic-scale roughening of the Bi(111) plane.
-
electrochemical characteristics pyrolytic graphite mixture of 1 ethyl 3 methylimidazolium tetrafluoroborate and 1 ethyl 3 methylimidazolium iodide interface
Journal of Electroanalytical Chemistry, 2014Co-Authors: Liis Siinor, K Lust, Joosep Poom, Carolin Siimenson, Enn LustAbstract:Abstract The interface between pyrolytic graphite (PG) and the mixture of 1-Ethyl-3-Methylimidazolium tetrafluoroborate (EMImBF 4 ) and 1-Ethyl-3-Methylimidazolium iodide (EMImI) were electrochemically characterized by using cyclic voltammetry and electrochemical impedance spectroscopy. The addition of EMImI in EMImBF 4 influences the region of ideal polarizability and formation/rearrangement kinetics of the electrical double layer. The values of series and parallel capacitances, adsorption kinetics of ions and adsorption capacitance of the PG|EMImI + EMImBF 4 interface were obtained. The PG electrode in EMImBF 4 is ideally polarizable from −1.1 V to 1.3 V vs. Ag|AgCl. The mixture of ionic liquids was tested within wider potential region to see what happens at more positive potentials considering the possible specific adsorption of I − ions. The shape of the differential capacitance vs. potential curves depends strongly on the addition of EMImI, electrode potential and ac frequency. There are two capacitance maxima in the differential capacitance vs. potential curve. Based on the analysis of impedance data, the first capacitance maximum is mainly caused by the specific adsorption of iodide ions with the partial charge transfer from ions to the electrode surface and vice versa, while the second capacitance maximum has been assumed to be initiated by the faradic pseudocapacitive behavior at the PG|EMImI + EMImBF 4 interface.
-
mixture of 1 ethyl 3 methylimidazolium tetrafluoroborate and 1 ethyl 3 methylimidazolium iodide a new potential high capacitance electrolyte for edlcs
Electrochemistry Communications, 2013Co-Authors: Liis Siinor, K Lust, Carolin Siimenson, Enn LustAbstract:Abstract The electrochemical characteristics of the interface between Bi(111) and the mixture of 1-Ethyl-3-Methylimidazolium tetrafluoroborate and 1-Ethyl-3-Methylimidazolium iodide were electrochemically characterized by using cyclic voltammetry and electrochemical impedance spectroscopy. The region of ideal polarizability, the formation/rearrangement kinetics of the electrical double layer, the values of series and parallel capacitance and the adsorption kinetics of ions depend on the addition of EMImI in the mixture. Based on the experimental data, it was found that the region of ideal polarizability of Bi(111) single crystal electrode in the mixture under study is comparable to the values measured in “pure” ionic liquids. Capacitance depends strongly on AC frequency and electrode potential, increasing considerably at E > − 0.7 V vs. Ag|AgCl, where the specific adsorption of iodide ions with partial charge transfer from ions to electrode surface and vice versa occurs.
K Lust - One of the best experts on this subject based on the ideXlab platform.
-
the electrochemical characteristics of the mixture of 1 ethyl 3 methylimidazolium tetrafluoroborate and 1 ethyl 3 methylimidazolium iodide
Journal of Electroanalytical Chemistry, 2014Co-Authors: Carolin Siimenson, Liis Siinor, K Lust, Enn LustAbstract:Abstract The electrochemical behavior and characteristics of the interface between Bi(1 1 1) and 1-Ethyl-3-Methylimidazolium iodide solution in 1-Ethyl-3-Methylimidazolium tetrafluoroborate with variable concentrations were investigated by using cyclic voltammetry and electrochemical impedance spectroscopy. The shape of the complex impedance plane plots, the values of the phase angle and capacitance depend strongly on the concentration of EMImI in the mixture of ionic liquids, on ac frequency and on the electrode potential applied. The capacitance values increase considerably at potentials higher than −0.6 V vs. Ag|AgCl| mixture of RTIL, were the specific adsorption of iodide ions takes place. Comparison of the data for the Bi(1 1 1) electrode and the highly oriented pyrolytic graphite C(0 0 0 1) shows that the chemical nature and the crystallographic structure of an electrode significantly influence the specific adsorption of the halide ions. The non-linear least squares fitting method has been applied for calculation of equivalent circuit parameters for Bi(1 1 1)|mixture of RTIL interface.
-
electrochemical characteristics pyrolytic graphite mixture of 1 ethyl 3 methylimidazolium tetrafluoroborate and 1 ethyl 3 methylimidazolium iodide interface
Journal of Electroanalytical Chemistry, 2014Co-Authors: Liis Siinor, K Lust, Joosep Poom, Carolin Siimenson, Enn LustAbstract:Abstract The interface between pyrolytic graphite (PG) and the mixture of 1-Ethyl-3-Methylimidazolium tetrafluoroborate (EMImBF 4 ) and 1-Ethyl-3-Methylimidazolium iodide (EMImI) were electrochemically characterized by using cyclic voltammetry and electrochemical impedance spectroscopy. The addition of EMImI in EMImBF 4 influences the region of ideal polarizability and formation/rearrangement kinetics of the electrical double layer. The values of series and parallel capacitances, adsorption kinetics of ions and adsorption capacitance of the PG|EMImI + EMImBF 4 interface were obtained. The PG electrode in EMImBF 4 is ideally polarizable from −1.1 V to 1.3 V vs. Ag|AgCl. The mixture of ionic liquids was tested within wider potential region to see what happens at more positive potentials considering the possible specific adsorption of I − ions. The shape of the differential capacitance vs. potential curves depends strongly on the addition of EMImI, electrode potential and ac frequency. There are two capacitance maxima in the differential capacitance vs. potential curve. Based on the analysis of impedance data, the first capacitance maximum is mainly caused by the specific adsorption of iodide ions with the partial charge transfer from ions to the electrode surface and vice versa, while the second capacitance maximum has been assumed to be initiated by the faradic pseudocapacitive behavior at the PG|EMImI + EMImBF 4 interface.
-
mixture of 1 ethyl 3 methylimidazolium tetrafluoroborate and 1 ethyl 3 methylimidazolium iodide a new potential high capacitance electrolyte for edlcs
Electrochemistry Communications, 2013Co-Authors: Liis Siinor, K Lust, Carolin Siimenson, Enn LustAbstract:Abstract The electrochemical characteristics of the interface between Bi(111) and the mixture of 1-Ethyl-3-Methylimidazolium tetrafluoroborate and 1-Ethyl-3-Methylimidazolium iodide were electrochemically characterized by using cyclic voltammetry and electrochemical impedance spectroscopy. The region of ideal polarizability, the formation/rearrangement kinetics of the electrical double layer, the values of series and parallel capacitance and the adsorption kinetics of ions depend on the addition of EMImI in the mixture. Based on the experimental data, it was found that the region of ideal polarizability of Bi(111) single crystal electrode in the mixture under study is comparable to the values measured in “pure” ionic liquids. Capacitance depends strongly on AC frequency and electrode potential, increasing considerably at E > − 0.7 V vs. Ag|AgCl, where the specific adsorption of iodide ions with partial charge transfer from ions to electrode surface and vice versa occurs.
-
electrical double layer capacitance at bi 111 1 ethyl 3 methylimidazolium tetrafluoroborate interface as a function of the electrode potential
Journal of The Electrochemical Society, 2010Co-Authors: Liis Siinor, K Lust, Enn LustAbstract:The influence of the electrode potential on the Bi(111) | 1-Ethyl-3-Methylimidazolium tetrafluoroborate interface has been studied by cyclic voltammetry and electrochemical impedance. The weak deviation of the system from capacitive behavior for the ideally flat electrode has been established within the moderate electrode potential region from -0.9 to -0.1 V vs Ag | AgCl in 1-Ethyl-3-Methylimidazolium tetrafluoroborate. The parallel faradaic processes are possible outside the potential region from -0.9 to -0.1 V. The results obtained for the Bi(111) | 1-Ethyl-3-Methylimidazolium tetrafluoroborate interface have been compared with those for gold, mercury, and glassy carbon electrodes.
Michael Gratzel - One of the best experts on this subject based on the ideXlab platform.
-
stable mesoscopic dye sensitized solar cells based on tetracyanoborate ionic liquid electrolyte
Journal of the American Chemical Society, 2006Co-Authors: Daibin Kuang, Peng Wang, Shaik M Zakeeruddin, Seigo Ito, Michael GratzelAbstract:A stable dye-sensitized solar cell has been obtained based on a new binary ionic liquid electrolyte system containing 1-propyl-3-methylimidazolium iodide and 1-Ethyl-3-Methylimidazolium tetracyanoborate.
-
a binary ionic liquid electrolyte to achieve 7 power conversion efficiencies in dye sensitized solar cells
Chemistry of Materials, 2004Co-Authors: Peng Wang, Shaik M Zakeeruddin, Robin Humphrybaker, Michael GratzelAbstract:For the first time ≥7% power conversion efficiencies under AM 1.5 sunlight have been acheived for photovoltaic devices with a binary ionic liquid electrolyte composed of 1-propyl-3-methylimidazolium iodide and 1-Ethyl-3-Methylimidazolium thiocyanate.
