A flexible cofacial Fe porphyrin dimer as an extremely efficient and selective electrocatalyst for the CO2 to CO conversion in non-aqueous and aqueous media

2021 ◽  
Author(s):  
Eman A. Mohamed ◽  
Zaki Zahran ◽  
Yoshinori Naruta
Keyword(s):  
Electrochemical Reduction ◽  
Aqueous Media ◽  
Value Added ◽  
Green House ◽  
Co Conversion ◽  
Reduction Of Co2 ◽  
Porphyrin Dimer

Efficient and selective electrochemical reduction of CO2 is a promising approach for its conversion to high value-added chemicals and reducing its green-house effect. Unless a suitable catalyst, the reduction occurs...

scholarly journals Low-Overpotential Electrochemical Reduction of CO2 to Formic Acid on Surface-Modified Doped Tin Oxide Pellets

2019 ◽  
Author(s):  
Emmanuel Abdul ◽  
Jason Pitts ◽  
Deepak Rajput ◽  
Shankar Rananavare
Keyword(s):  
Formic Acid ◽  
Electrochemical Reduction ◽  
Current Density ◽  
Tin Oxide ◽  
Aqueous Media ◽  
Oxide Nanoparticles ◽  
Faradaic Efficiency ◽  
Electrode Potentials ◽  
Tin Oxide Nanoparticles ◽  
Reduction Of Co2

Gas sensors fabricated with antimony doped tin oxide (ATO) nanomaterials exhibit remarkable sensitivity for detecting oxidizing and reducing gases. This study highlights the enhanced selectivity and stability of the porous ATO nanomaterial electrode made for electrochemical reduction of CO2 in aqueous media. During electrochemical reduction, these electrodes prepared from compressed powders tend to crumble within a few hours in aqueous media. To overcome this electrode disintegration effect, we modified the surface of the doped tin-Oxide nanoparticles with Nafion and a dipodal silane (1,2-Bis(triethoxysilyl)ethane). The electrode characterization studies include Cyclic Voltammetry (CV), and Electrochemical Impedance Spectroscopy (EIS). Scanning electron microscopic investigation of electrode surface morphology and roughness before and after electrochemical CO2 reduction for derivatized and underivatized electrode revealed lower surface roughness for former than the latter.The derivatized electrodes allowed CO2 electrochemical reduction at low overpotentials and high current density without any electrode crumbling over more than 24 hours of continuous operation. Formate/formic acid and methanol were the major products of reduction at electrode potentials ranging from -0.4 to -1.0V vs. RHE in the CO2 saturated 0.1M KHCO3 electrolyte. Higher current density and Faradaic Efficiency of formic acid was observed when compared to planar tin electrode materials and tin oxide nanoparticles deposited on FTO glass.

Efficient electrochemical reduction of CO2 promoted by the electrospun Cu1.96S/Cu tandem catalyst

Nanoscale ◽  
2021 ◽  
Author(s):  
Shuo Liu ◽  
Yu Cao ◽  
Hai Liu ◽  
HuiLi Wang ◽  
Baoshan Zhang ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Value Added ◽  
Renewable Electricity ◽  
Reduction Of Co2

Coupled with renewable electricity, electrochemical reduction of CO2 (CO2RR) is one of the sustainable strategies for the production of value-added carbon-containing chemicals. Cu-based catalysts are by far the most widely...

Electropolymerized Metal-Protoporphyrin electrodes for Selective Electrochemical Reduction of CO2

2021 ◽  
Author(s):  
Nael Yasri ◽  
Tareq Al-Attas ◽  
Jinguang Hu ◽  
Md Golam Kibria
Keyword(s):  
Electrochemical Reduction ◽  
Aqueous Media ◽  
Co2 Reduction ◽  
Reduction Reaction ◽  
Practical Implementation ◽  
Electrochemical Co2 Reduction ◽  
Reduction Of Co2 ◽  
Co2 Reduction Reaction

Developing catalysts that exhibit high efficiencies for the electrochemical CO2 reduction reaction (CO2RR) in aqueous media is vital in both aspects of the healthier environment and for the practical implementation...

scholarly journals Effect of the Nanostructured Zn/Cu Electrocatalyst Morphology on the Electrochemical Reduction of CO2 to Value-Added Chemicals

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1671
Author(s):  
Piriya Pinthong ◽  
Phongsathon Klongklaew ◽  
Piyasan Praserthdam ◽  
Joongjai Panpranot
Keyword(s):  
Particle Size ◽  
Electrochemical Reduction ◽  
Production Rate ◽  
Dendritic Structure ◽  
Value Added ◽  
Major Product ◽  
Ambient Conditions ◽  
Zn Concentration ◽  
Reduction Of Co2 ◽  
Zn Nanoparticles

Zn/Cu electrocatalysts were synthesized by the electrodeposition method with various bath compositions and deposition times. X-ray diffraction results confirmed the presence of (101) and (002) lattice structures for all the deposited Zn nanoparticles. However, a bulky (hexagonal) structure with particle size in the range of 1–10 μm was obtained from a high-Zn-concentration bath, whereas a fern-like dendritic structure was produced using a low Zn concentration. A larger particle size of Zn dendrites could also be obtained when Cu2+ ions were added to the high-Zn-concentration bath. The catalysts were tested in the electrochemical reduction of CO2 (CO2RR) using an H-cell type reactor under ambient conditions. Despite the different sizes/shapes, the CO2RR products obtained on the nanostructured Zn catalysts depended largely on their morphologies. All the dendritic structures led to high CO production rates, while the bulky Zn structure produced formate as the major product, with limited amounts of gaseous CO and H2. The highest CO/H2 production rate ratio of 4.7 and a stable CO production rate of 3.55 μmol/min were obtained over the dendritic structure of the Zn/Cu–Na200 catalyst at −1.6 V vs. Ag/AgCl during 4 h CO2RR. The dissolution and re-deposition of Zn nanoparticles occurred but did not affect the activity and selectivity in the CO2RR of the electrodeposited Zn catalysts. The present results show the possibilities to enhance the activity and to control the selectivity of CO2RR products on nanostructured Zn catalysts.

Electrocatalytic process of CO selectivity in electrochemical reduction of CO2 at metal electrodes in aqueous media

1994 ◽  
Vol 39 (11-12) ◽  
pp. 1833-1839 ◽  
Author(s):  
Yoshio Hori ◽  
Hidetoshi Wakebe ◽  
Toshio Tsukamoto ◽  
Osamu Koga
Keyword(s):  
Electrochemical Reduction ◽  
Aqueous Media ◽  
Metal Electrodes ◽  
Reduction Of Co2

scholarly journals Enhanced selectivity of carbonaceous products from electrochemical reduction of CO2 in aqueous media

2019 ◽  
Vol 30 ◽  
pp. 214-221 ◽  
Author(s):  
Hang Xiang ◽  
Shahid Rasul ◽  
Keith Scott ◽  
Jose Portoles ◽  
Peter Cumpson ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Aqueous Media ◽  
Reduction Of Co2 ◽  
Enhanced Selectivity

scholarly journals Three-Dimensional Cathodes for Electrochemical Reduction of CO2: From Macro- to Nano-Engineering

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1884 ◽  
Author(s):  
Shiqiang (Rob) Hui ◽  
Nima Shaigan ◽  
Vladimir Neburchilov ◽  
Lei Zhang ◽  
Kourosh Malek ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
High Performance ◽  
Three Dimensional ◽  
Value Added ◽  
Global Response ◽  
Future Challenges ◽  
Fuels And Chemicals ◽  
Reduction Of Co2 ◽  
Renewable Energy Storage ◽  
Value Added Products

Rising anthropogenic CO2 emissions and their climate warming effects have triggered a global response in research and development to reduce the emissions of this harmful greenhouse gas. The use of CO2 as a feedstock for the production of value-added fuels and chemicals is a promising pathway for development of renewable energy storage and reduction of carbon emissions. Electrochemical CO2 conversion offers a promising route for value-added products. Considerable challenges still remain, limiting this technology for industrial deployment. This work reviews the latest developments in experimental and modeling studies of three-dimensional cathodes towards high-performance electrochemical reduction of CO2. The fabrication–microstructure–performance relationships of electrodes are examined from the macro- to nanoscale. Furthermore, future challenges, perspectives and recommendations for high-performance cathodes are also presented.

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