The Experts below are selected from a list of 52500 Experts worldwide ranked by ideXlab platform
Daniel R Little - One of the best experts on this subject based on the ideXlab platform.
-
aromatic c h bond functionalization induced by electrochemically in situ generated tris p bromophenyl aminium radical cation cationic chain reactions of electron rich aromatics with enamides
Journal of Organic Chemistry, 2015Co-Authors: Longji Li, Yangye Jiang, Chengchu Zeng, Liming Hu, Daniel R LittleAbstract:An effective Friedel–Crafts alkylation reaction of electron-rich aromatics with N-vinylamides, induced by electrochemically in situ-generated TBPA radical cation, has been developed; the resulting adducts are produced in good to excellent yields. In the “ex-cell” type Electrolysis, TBPA is transformed to its oxidized form in situ and subsequently employed as an electron transfer reagent to initiate a cationic chain reaction. An easily recoverable and reusable polymeric ionic liquid–carbon black (PIL–CB) composite was also utilized as a supporting electrolyte for the electrochemical generation of TBPA cation radical, without sacrificing efficiency or stability after four electrolyses. Cyclic voltammetry analysis and the results of control experiments demonstrate that the reaction of electron-rich aromatics and N-vinylamides occurs via a cationic chain reaction, which takes place though an oxidative activation of a C–H bond of electron-rich aromatics instead of oxidation of the N-vinylamide as previously as...
-
aromatic c h bond functionalization induced by electrochemically in situ generated tris p bromophenyl aminium radical cation cationic chain reactions of electron rich aromatics with enamides
Journal of Organic Chemistry, 2015Co-Authors: Yangye Jiang, Chengchu Zeng, Chiu Marco Lam, Daniel R LittleAbstract:An effective Friedel-Crafts alkylation reaction of electron-rich aromatics with N-vinylamides, induced by electrochemically in situ-generated TBPA radical cation, has been developed; the resulting adducts are produced in good to excellent yields. In the "ex-cell" type Electrolysis, TBPA is transformed to its oxidized form in situ and subsequently employed as an electron transfer reagent to initiate a cationic chain reaction. An easily recoverable and reusable polymeric ionic liquid-carbon black (PIL-CB) composite was also utilized as a supporting electrolyte for the electrochemical generation of TBPA cation radical, without sacrificing efficiency or stability after four electrolyses. Cyclic voltammetry analysis and the results of control experiments demonstrate that the reaction of electron-rich aromatics and N-vinylamides occurs via a cationic chain reaction, which takes place though an oxidative activation of a C-H bond of electron-rich aromatics instead of oxidation of the N-vinylamide as previously assumed.
Dmitri Bessarabov - One of the best experts on this subject based on the ideXlab platform.
-
low cost hydrogen production by anion exchange membrane Electrolysis a review
Renewable & Sustainable Energy Reviews, 2018Co-Authors: Immanuel Vincent, Dmitri BessarabovAbstract:Abstract Anion exchange membrane (AEM) water Electrolysis is a hydrogen production method that is achieved with an AEM, using electricity. One of the major advantages of AEM water Electrolysis is the replacement of conventional noble metal electrocatalysts with low cost transition metal catalysts. AEM Electrolysis is still a developing technology; therefore, with a view to using it to eventually achieve commercially viable hydrogen production, AEM Electrolysis requires further investigation and improvements, specifically regarding its power efficiency, membrane stability, robustness, ease of handling, and cost reduction. This review addresses state of the art technology of AEM Electrolysis for hydrogen production. It also provides a summary of important research that has been carried out on membranes, electrocatalysts, and ionomers used in AEM electrolyzers, and the performance of such electrolyzers. The aim of this review is to identify gaps in AEM water Electrolysis research and to make recommendations for future directions in AEM water Electrolysis research.
-
low cost hydrogen production by anion exchange membrane Electrolysis a review
Renewable & Sustainable Energy Reviews, 2018Co-Authors: Immanuel Vincent, Dmitri BessarabovAbstract:Anion exchange membrane (AEM) water Electrolysis is a hydrogen production method that is achieved with an AEM, using electricity. One of the major advantages of AEM water Electrolysis is the replacement of conventional noble metal electrocatalysts with low cost transition metal catalysts. AEM Electrolysis is still a developing technology; therefore, with a view to using it to eventually achieve commercially viable hydrogen production, AEM Electrolysis requires further investigation and improvements, specifically regarding its power efficiency, membrane stability, robustness, ease of handling, and cost reduction.
-
development of efficient membrane electrode assembly for low cost hydrogen production by anion exchange membrane Electrolysis
International Journal of Hydrogen Energy, 2017Co-Authors: Immanuel Vincent, Andries J Kruger, Dmitri BessarabovAbstract:Abstract Electrochemical production of hydrogen from water using anion exchange membranes (AEMs) can be achieved with non-noble catalysts, other than traditional proton exchange membranes that use platinum group metals. Using non-noble metals in the catalyst layer will reduce the capital costs associated with water Electrolysis systems. The objectives of this study were to develop an effective membrane electrode assembly (MEA) for AEM Electrolysis and to determine the effects of various operating parameters on AEM Electrolysis. Here, the MEA consisted of the commercially available A-201 AEM and non-noble transition metal oxides as catalysts. The best Electrolysis performance recorded was 500 mA cm −2 for 1.95 V at 60 °C with 1% K 2 CO 3 electrolyte. For the purpose of comparison, we also considered commercially available AEMs for AEM Electrolysis: Fumapem ® FAA-3 and Fumapem ® FAA-3-PP-75. The performances achieved with these AEMs were comparable with the performance recorded for the conventional AEM A-201. Overall, our results indicated that AEM Electrolysis clearly manifests the feasibility of commercial viability.
Immanuel Vincent - One of the best experts on this subject based on the ideXlab platform.
-
highly cost effective platinum free anion exchange membrane Electrolysis for large scale energy storage and hydrogen production
RSC Advances, 2020Co-Authors: Immanuel Vincent, Eunchong Lee, Hyungman KimAbstract:Anion exchange membrane (AEM) Electrolysis eradicates platinum group metal electrocatalysts and diaphragms and is used in conventional proton exchange membrane (PEM) Electrolysis and alkaline Electrolysis. It can produce pressurised hydrogen by using low cost non-noble metal catalysts. However, the performances are still lower than that of the conventional PEM Electrolysis technology. In this study, we addressed the performance issue by using a novel combination of Ni–Fe–Ox for oxygen evolution reaction (OER) and Ni–Fe–Co hydrogen evolution reaction (HER) electrodes with a PBI anion exchange membrane. The Ni–Fe–Ox and Ni–Fe–Co electrodes exhibit exceptionally high catalytic activity, requiring over potentials that are as low as 236 and 84 mV dec−1, respectively, for OER and HER to occur. These electrocatalysts exhibits excellent durability which can be used as oxygen evolution and hydrogen evolution catalysts for long term Electrolysis. The high rate capability of 1000 mA cm−2 at 1.9 V and 60 °C demonstrates the potential of the combined membrane electrode assembly. The best performance, which is comparable to those of commercial PEM Electrolysis systems, is thus an affordable alternative to this technology. In addition to that, the AEM Electrolysis is promising on a multi-scale level for long-term hydrogen production.
-
low cost hydrogen production by anion exchange membrane Electrolysis a review
Renewable & Sustainable Energy Reviews, 2018Co-Authors: Immanuel Vincent, Dmitri BessarabovAbstract:Anion exchange membrane (AEM) water Electrolysis is a hydrogen production method that is achieved with an AEM, using electricity. One of the major advantages of AEM water Electrolysis is the replacement of conventional noble metal electrocatalysts with low cost transition metal catalysts. AEM Electrolysis is still a developing technology; therefore, with a view to using it to eventually achieve commercially viable hydrogen production, AEM Electrolysis requires further investigation and improvements, specifically regarding its power efficiency, membrane stability, robustness, ease of handling, and cost reduction.
-
low cost hydrogen production by anion exchange membrane Electrolysis a review
Renewable & Sustainable Energy Reviews, 2018Co-Authors: Immanuel Vincent, Dmitri BessarabovAbstract:Abstract Anion exchange membrane (AEM) water Electrolysis is a hydrogen production method that is achieved with an AEM, using electricity. One of the major advantages of AEM water Electrolysis is the replacement of conventional noble metal electrocatalysts with low cost transition metal catalysts. AEM Electrolysis is still a developing technology; therefore, with a view to using it to eventually achieve commercially viable hydrogen production, AEM Electrolysis requires further investigation and improvements, specifically regarding its power efficiency, membrane stability, robustness, ease of handling, and cost reduction. This review addresses state of the art technology of AEM Electrolysis for hydrogen production. It also provides a summary of important research that has been carried out on membranes, electrocatalysts, and ionomers used in AEM electrolyzers, and the performance of such electrolyzers. The aim of this review is to identify gaps in AEM water Electrolysis research and to make recommendations for future directions in AEM water Electrolysis research.
-
development of efficient membrane electrode assembly for low cost hydrogen production by anion exchange membrane Electrolysis
International Journal of Hydrogen Energy, 2017Co-Authors: Immanuel Vincent, Andries J Kruger, Dmitri BessarabovAbstract:Abstract Electrochemical production of hydrogen from water using anion exchange membranes (AEMs) can be achieved with non-noble catalysts, other than traditional proton exchange membranes that use platinum group metals. Using non-noble metals in the catalyst layer will reduce the capital costs associated with water Electrolysis systems. The objectives of this study were to develop an effective membrane electrode assembly (MEA) for AEM Electrolysis and to determine the effects of various operating parameters on AEM Electrolysis. Here, the MEA consisted of the commercially available A-201 AEM and non-noble transition metal oxides as catalysts. The best Electrolysis performance recorded was 500 mA cm −2 for 1.95 V at 60 °C with 1% K 2 CO 3 electrolyte. For the purpose of comparison, we also considered commercially available AEMs for AEM Electrolysis: Fumapem ® FAA-3 and Fumapem ® FAA-3-PP-75. The performances achieved with these AEMs were comparable with the performance recorded for the conventional AEM A-201. Overall, our results indicated that AEM Electrolysis clearly manifests the feasibility of commercial viability.
Yangye Jiang - One of the best experts on this subject based on the ideXlab platform.
-
aromatic c h bond functionalization induced by electrochemically in situ generated tris p bromophenyl aminium radical cation cationic chain reactions of electron rich aromatics with enamides
Journal of Organic Chemistry, 2015Co-Authors: Longji Li, Yangye Jiang, Chengchu Zeng, Liming Hu, Daniel R LittleAbstract:An effective Friedel–Crafts alkylation reaction of electron-rich aromatics with N-vinylamides, induced by electrochemically in situ-generated TBPA radical cation, has been developed; the resulting adducts are produced in good to excellent yields. In the “ex-cell” type Electrolysis, TBPA is transformed to its oxidized form in situ and subsequently employed as an electron transfer reagent to initiate a cationic chain reaction. An easily recoverable and reusable polymeric ionic liquid–carbon black (PIL–CB) composite was also utilized as a supporting electrolyte for the electrochemical generation of TBPA cation radical, without sacrificing efficiency or stability after four electrolyses. Cyclic voltammetry analysis and the results of control experiments demonstrate that the reaction of electron-rich aromatics and N-vinylamides occurs via a cationic chain reaction, which takes place though an oxidative activation of a C–H bond of electron-rich aromatics instead of oxidation of the N-vinylamide as previously as...
-
aromatic c h bond functionalization induced by electrochemically in situ generated tris p bromophenyl aminium radical cation cationic chain reactions of electron rich aromatics with enamides
Journal of Organic Chemistry, 2015Co-Authors: Yangye Jiang, Chengchu Zeng, Chiu Marco Lam, Daniel R LittleAbstract:An effective Friedel-Crafts alkylation reaction of electron-rich aromatics with N-vinylamides, induced by electrochemically in situ-generated TBPA radical cation, has been developed; the resulting adducts are produced in good to excellent yields. In the "ex-cell" type Electrolysis, TBPA is transformed to its oxidized form in situ and subsequently employed as an electron transfer reagent to initiate a cationic chain reaction. An easily recoverable and reusable polymeric ionic liquid-carbon black (PIL-CB) composite was also utilized as a supporting electrolyte for the electrochemical generation of TBPA cation radical, without sacrificing efficiency or stability after four electrolyses. Cyclic voltammetry analysis and the results of control experiments demonstrate that the reaction of electron-rich aromatics and N-vinylamides occurs via a cationic chain reaction, which takes place though an oxidative activation of a C-H bond of electron-rich aromatics instead of oxidation of the N-vinylamide as previously assumed.
Chengchu Zeng - One of the best experts on this subject based on the ideXlab platform.
-
aromatic c h bond functionalization induced by electrochemically in situ generated tris p bromophenyl aminium radical cation cationic chain reactions of electron rich aromatics with enamides
Journal of Organic Chemistry, 2015Co-Authors: Longji Li, Yangye Jiang, Chengchu Zeng, Liming Hu, Daniel R LittleAbstract:An effective Friedel–Crafts alkylation reaction of electron-rich aromatics with N-vinylamides, induced by electrochemically in situ-generated TBPA radical cation, has been developed; the resulting adducts are produced in good to excellent yields. In the “ex-cell” type Electrolysis, TBPA is transformed to its oxidized form in situ and subsequently employed as an electron transfer reagent to initiate a cationic chain reaction. An easily recoverable and reusable polymeric ionic liquid–carbon black (PIL–CB) composite was also utilized as a supporting electrolyte for the electrochemical generation of TBPA cation radical, without sacrificing efficiency or stability after four electrolyses. Cyclic voltammetry analysis and the results of control experiments demonstrate that the reaction of electron-rich aromatics and N-vinylamides occurs via a cationic chain reaction, which takes place though an oxidative activation of a C–H bond of electron-rich aromatics instead of oxidation of the N-vinylamide as previously as...
-
aromatic c h bond functionalization induced by electrochemically in situ generated tris p bromophenyl aminium radical cation cationic chain reactions of electron rich aromatics with enamides
Journal of Organic Chemistry, 2015Co-Authors: Yangye Jiang, Chengchu Zeng, Chiu Marco Lam, Daniel R LittleAbstract:An effective Friedel-Crafts alkylation reaction of electron-rich aromatics with N-vinylamides, induced by electrochemically in situ-generated TBPA radical cation, has been developed; the resulting adducts are produced in good to excellent yields. In the "ex-cell" type Electrolysis, TBPA is transformed to its oxidized form in situ and subsequently employed as an electron transfer reagent to initiate a cationic chain reaction. An easily recoverable and reusable polymeric ionic liquid-carbon black (PIL-CB) composite was also utilized as a supporting electrolyte for the electrochemical generation of TBPA cation radical, without sacrificing efficiency or stability after four electrolyses. Cyclic voltammetry analysis and the results of control experiments demonstrate that the reaction of electron-rich aromatics and N-vinylamides occurs via a cationic chain reaction, which takes place though an oxidative activation of a C-H bond of electron-rich aromatics instead of oxidation of the N-vinylamide as previously assumed.