Mild pyrolysis of ionic self-assembled cobalt porphyrins on carbon toward efficient electrochemical conversion of CO2 to CO

2019 ◽  
Vol 55 (39) ◽  
pp. 5659-5662 ◽  
Author(s):  
Xue Zhang ◽  
Huiyuan Liu ◽  
Jiaqi Qin ◽  
Hongsa Han ◽  
Chenxi Qiu ◽  
...  
Keyword(s):  
Faradaic Efficiency ◽  
Electrochemical Conversion ◽  
Heat Treated ◽  
Cobalt Porphyrins ◽  
Low Overpotential ◽  
Self Assembled ◽  
Mild Pyrolysis

Heat-treated self-assembled cobalt porphyrins on carbon electrochemically convert CO2 to CO with a high faradaic efficiency and at a low overpotential.

scholarly journals A Supramolecular Porous Organic Cage Platform Promotes Electrochemical Hydrogen Evolution from Water Catalyzed by Cobalt Porphyrins

2021 ◽  
Author(s):  
Peter T. Smith ◽  
Bahiru Punja Benke ◽  
Lun An ◽  
Younghoon Kim ◽  
Kimoon Kim ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Supramolecular Structure ◽  
Fold Increase ◽  
Faradaic Efficiency ◽  
Tafel Slope ◽  
Neutral Ph ◽  
Catalyst Film ◽  
Electrochemically Active ◽  
Cobalt Porphyrins

We report a supramolecular porous organic cage platform composed of cobalt porphyrins for catalyzing the electrochemical hydrogen evolution reaction (HER) from water at neutral pH. Owing to its permanent porosity, the supramolecular structure yields a catalyst film with a 5-fold increase in the number of electrochemically active cobalt atoms and an improvement in Tafel slope from 170 mV/decade to 119 mV/decade compared to a planar cobalt porphyrin analog, reaching activities over 19,000 turnovers for HER over a 24-hour period with 100% Faradaic efficiency.

CO2 reduction to formic acid at low overpotential on BDD electrodes modified with nanostructured CeO2

2019 ◽  
Vol 7 (30) ◽  
pp. 17896-17905 ◽  
Author(s):  
Enrico Verlato ◽  
Simona Barison ◽  
Yasuaki Einaga ◽  
Stefano Fasolin ◽  
Marco Musiani ◽  
...  
Keyword(s):  
Formic Acid ◽  
Co2 Reduction ◽  
Faradaic Efficiency ◽  
Low Overpotential

Nanostructured CeO2/BDD electrodes produce formic acid with good faradaic efficiency at very low overpotential (>40% at η ≈ 40 mV).

scholarly journals A Supramolecular Porous Organic Cage Platform Promotes Electrochemical Hydrogen Evolution from Water Catalyzed by Cobalt Porphyrins

2021 ◽  
Author(s):  
Peter T. Smith ◽  
Bahiru Punja Benke ◽  
Lun An ◽  
Younghoon Kim ◽  
Kimoon Kim ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Supramolecular Structure ◽  
Fold Increase ◽  
Faradaic Efficiency ◽  
Tafel Slope ◽  
Neutral Ph ◽  
Catalyst Film ◽  
Electrochemically Active ◽  
Cobalt Porphyrins

We report a supramolecular porous organic cage platform composed of cobalt porphyrins for catalyzing the electrochemical hydrogen evolution reaction (HER) from water at neutral pH. Owing to its permanent porosity, the supramolecular structure yields a catalyst film with a 5-fold increase in the number of electrochemically active cobalt atoms and an improvement in Tafel slope from 170 mV/decade to 119 mV/decade compared to a planar cobalt porphyrin analog, reaching activities over 19,000 turnovers for HER over a 24-hour period with 100% Faradaic efficiency.

Self-assembled nanodendritic PdPtCu nanosheets/ Ti2CTx-CNTs electrocatalysts for low overpotential and long-term stable hydrogen evolution reaction

2021 ◽  
Author(s):  
Yong Tan ◽  
Linghan Deng ◽  
Kai Qi ◽  
Chuanxiang Qin ◽  
Si Cheng
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Two Dimensional ◽  
Term Stability ◽  
Long Term Stability ◽  
Low Overpotential ◽  
Self Assembled

Reducing the overpotential and achieving long-term stability of electrocatalysts are vital for facilitating the catalytic activity of hydrogen evolution reaction (HER). Herein, two-dimensional dendritic PdPtCu nanosheets were prepared and further...

Enhanced CO2 electroreduction efficiency through secondary coordination effects on a pincer iridium catalyst

2015 ◽  
Vol 51 (27) ◽  
pp. 5947-5950 ◽  
Author(s):  
Steven T. Ahn ◽  
Elizabeth A. Bielinski ◽  
Elizabeth M. Lane ◽  
Yanqiao Chen ◽  
Wesley H. Bernskoetter ◽  
...  
Keyword(s):  
Electrocatalytic Reduction ◽  
Pincer Ligand ◽  
Faradaic Efficiency ◽  
Iridium Catalyst ◽  
Co2 Electroreduction ◽  
Low Overpotential

An iridium trihydride complex supported by a bifunctional pincer ligand promotes the electrocatalytic reduction of CO2 to formate in with excellent Faradaic efficiency and low overpotential.

Activation of CO2by ionic liquid EMIM–BF4in the electrochemical system: a theoretical study

2015 ◽  
Vol 17 (36) ◽  
pp. 23521-23531 ◽  
Author(s):  
Yuanqing Wang ◽  
Makoto Hatakeyama ◽  
Koji Ogata ◽  
Masamitsu Wakabayashi ◽  
Fangming Jin ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Electrochemical Reduction ◽  
Theoretical Study ◽  
Electrochemical System ◽  
Faradaic Efficiency ◽  
Reduction Processes ◽  
System A ◽  
Low Overpotential

The electrochemical reduction of CO2to CO by an ionic liquid EMIM–BF4is one of the most promising CO2reduction processes proposed so far with its high Faradaic efficiency and low overpotential.

scholarly journals Covalent triazine framework/carbon nanotube hybrids enabling selective reduction of CO2 to CO at low overpotential

2020 ◽  
Vol 22 (10) ◽  
pp. 3095-3103
Author(s):  
Andreas Laemont ◽  
Sara Abednatanzi ◽  
Parviz Gohari Derakshandeh ◽  
Florian Verbruggen ◽  
Erika Fiset ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Selective Reduction ◽  
Functionalized Carbon Nanotubes ◽  
Faradaic Efficiency ◽  
Hybrid Catalysts ◽  
Low Overpotential ◽  
Covalent Triazine Framework ◽  
Reduction Of Co2

Nitrogen-rich covalent triazine frameworks (CTFs) were grown in situ onto surface-functionalized carbon nanotubes. These novel hybrid catalysts electrochemically reduce CO2 to CO with a faradaic efficiency up to 81% at an overpotential of 380 mV.

Carbon neutral electrochemical conversion of carbon dioxide mediated by [Mn+(cyclam)Cln] (M = Ni2+ and Co3+) on mercury free electrodes and ionic liquids as reaction media

2017 ◽  
Vol 19 (4) ◽  
pp. 1155-1162 ◽  
Author(s):  
J. Honores ◽  
D. Quezada ◽  
M. García ◽  
K. Calfumán ◽  
J. P. Muena ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Ionic Liquids ◽  
Faradaic Efficiency ◽  
Electrochemical Conversion ◽  
Carbon Neutral ◽  
Cyclam Complexes ◽  
Reaction Media

Carbon dioxide is reduced to carbon monoxide with high faradaic efficiency on mercury free electrodes using M(cyclam) complexes.

scholarly journals Preparation and Characterization of Self-Assembled Thin Film of MPS-Capped ZnS Quantum Dots for Optical Applications

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Kenan Koç ◽  
Fatma Z. Tepehan ◽  
Galip G. Tepehan
Keyword(s):  
Heat Treatment ◽  
Quantum Dots ◽  
Optical Filter ◽  
Refractive Indices ◽  
Glass Substrates ◽  
Heat Treated ◽  
Dielectric Coefficient ◽  
Self Assembled ◽  
Optical Applications

For this study, we prepared colloidal ZnS quantum dots using 3-mercaptopropyltrimethoxysilane (MPS) as the capping agent. Colloidal ZnS quantum dots were directly deposited on glass substrates by a spin coating process. Therefore, self-assembled films made of ZnS quantum dots in a SiO2network were obtained using only one production step. The films were heat-treated at 100°, 125°, 150°, 175° and 200°C in an N2atmosphere. The results showed that the dimension of quantum dots changed from 2.8 nm to 3.2 nm by heat treatment. The refractive index, extinction coefficient, thickness, and dielectric coefficient values of the films were calculated. The present study showed that size and the refractive indices of films can be controlled by the heat treatment. Therefore, such films can be a good candidate in optical filter applications.

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