scholarly journals Electrochemical Reduction of Carbon Dioxide over CNT-Supported Nanoscale Copper Electrocatalysts

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Sk. Safdar Hossain ◽  
Sleem ur Rahman ◽  
Shakeel Ahmed
Keyword(s):  
Carbon Dioxide ◽  
Electrochemical Reduction ◽  
High Current Density ◽  
Linear Sweep Voltammetry ◽  
Maximum Activity ◽  
Structure Characterization ◽  
Precipitation Method ◽  
Potential Range ◽  
Faradaic Efficiency ◽  
Methanol Formation

This paper presents the experimental investigation of copper loaded carbon nanotubes (CNTs) electrocatalysts for the electrochemical reduction of carbon dioxide. The electrocatalysts were synthesized by homogeneous deposition precipitation method (HDP) using urea as precipitating agent. The prepared catalysts were characterized by TEM, SEM, XRD, XPS, BET, and FTIR for their morphology and structure. Characterization results confirm the deposition of Cu nanoparticles (3–60 nm) on CNTs. Linear sweep voltammetry (LSV) and chronoamperometry (CA) were used to investigate the activity of the as-prepared catalysts for the electrochemical reduction of carbon dioxide. The electrocatalysts reduced CO2with high current density in the potential range 0~−3 V versus SCE (standard calomel electrode). Among all catalysts tested, 20 wt. % copper loaded CNTs showed maximum activity. Gas chromatograph with TCD was used to analyze liquid phase composition. The faradaic efficiency for methanol formation was estimated to be 38.5%.

Clam-shaped cyclam-functionalized porphyrin for electrochemical reduction of carbon dioxide

2019 ◽  
Vol 23 (04n05) ◽  
pp. 453-461
Author(s):  
Sumana Tawil ◽  
Hathaichanok Seelajaroen ◽  
Amorn Petsom ◽  
Niyazi Serdar Sariciftci ◽  
Patchanita Thamyongkit
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Cyclic Voltammetry ◽  
Catalytic Activity ◽  
Electrochemical Reduction ◽  
Target Compound ◽  
Faradaic Efficiency ◽  
Controlled Potential Electrolysis ◽  
Improved Stability ◽  
Controlled Potential

A clam-shaped molecule comprising a Zn(II)-porphyrin and a Zn(II)-cyclam is synthesized and characterized. Its electrochemical behavior and catalytic activity for homogeneous electrochemical reduction of carbon dioxide (CO[Formula: see text] are investigated by cyclic voltammetry and compared with those of Zn(II)-meso-tetraphenylporphyrin and Zn(II)-cyclam. Under N2-saturated conditions, cyclic voltammetry of the featured complex has characteristics of its two constituents, but under CO2-saturated conditions, the target compound exhibits significant current enhancement. Iterative reduction under electrochemical conditions indicated the target compound has improved stability relative to Zn(II)-cyclam. Controlled potential electrolysis demonstrates that, without addition of water, methane (CH[Formula: see text] is the only detectable product with 1% Faradaic efficiency (FE). The formation of CH4 is not observed under the catalysis of the Zn(II)-porphyrin benchmark compound, indicating that the CO2-capturing function of the Zn(II)-cyclam unit contributes to the catalysis. Upon addition of 3% v/v water, the electrochemical reduction of CO2 in the presence of the target compound gives carbon monoxide (CO) with 28% FE. Dominance of CO formation under these conditions suggests enhancement of proton-coupled reduction. Integrated action of these Zn(II)-porphyrin and Zn(II)-cyclam units offers a notable example of a molecular catalytic system where the cyclam ring captures and brings CO2 into the proximity of the porphyrin catalysis center.

scholarly journals Elucidation of the Roles of Ionic Liquid in CO2 Electrochemical Reduction to Value-Added Chemicals and Fuels

Molecules ◽  
2021 ◽  
Vol 26 (22) ◽  
pp. 6962
Author(s):  
Sulafa Abdalmageed Saadaldeen Mohammed ◽  
Wan Zaireen Nisa Yahya ◽  
Mohamad Azmi Bustam ◽  
Md Golam Kibria
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquids ◽  
Reaction Mechanism ◽  
Electrochemical Reduction ◽  
Value Added ◽  
Faradaic Efficiency ◽  
Renewable Source ◽  
Carbon Dioxide Co2 ◽  
Physical And Chemical ◽  
Value Added Products

The electrochemical reduction of carbon dioxide (CO2ER) is amongst one the most promising technologies to reduce greenhouse gas emissions since carbon dioxide (CO2) can be converted to value-added products. Moreover, the possibility of using a renewable source of energy makes this process environmentally compelling. CO2ER in ionic liquids (ILs) has recently attracted attention due to its unique properties in reducing overpotential and raising faradaic efficiency. The current literature on CO2ER mainly reports on the effect of structures, physical and chemical interactions, acidity, and the electrode–electrolyte interface region on the reaction mechanism. However, in this work, new insights are presented for the CO2ER reaction mechanism that are based on the molecular interactions of the ILs and their physicochemical properties. This new insight will open possibilities for the utilization of new types of ionic liquids. Additionally, the roles of anions, cations, and the electrodes in the CO2ER reactions are also reviewed.

Constructing single Cu-N3 sites for CO2 electrochemical reduction over a wide potential range

2021 ◽  
Author(s):  
Jiaqi Feng ◽  
Lirong Zheng ◽  
Chongyang Jiang ◽  
Zhipeng Chen ◽  
Lei Liu ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electrochemical Reduction ◽  
Potential Range ◽  
Faradaic Efficiency ◽  
Wide Potential

Cu-N-doped carbon nanotube with unsaturated coordination Cu atom (Cu-N3) was fabricated and exhibited over 90% CO faradaic efficiency (FE) in a wide potential range from -0.42 to -0.92 V. The...

Electrochemical Reduction of Carbon Dioxide to Hydrocarbons with High Faradaic Efficiency in LiOH/Methanol

1999 ◽  
Vol 103 (35) ◽  
pp. 7456-7460 ◽  
Author(s):  
Satoshi Kaneco ◽  
Kenji Iiba ◽  
Syo-ko Suzuki ◽  
Kiyohisa Ohta ◽  
Takayuki Mizuno
Keyword(s):  
Carbon Dioxide ◽  
Electrochemical Reduction ◽  
Faradaic Efficiency

scholarly journals Highly efficient binary copper−iron catalyst for photoelectrochemical carbon dioxide reduction toward methane

2020 ◽  
Vol 117 (3) ◽  
pp. 1330-1338 ◽  
Author(s):  
Baowen Zhou ◽  
Pengfei Ou ◽  
Nick Pant ◽  
Shaobo Cheng ◽  
Srinivas Vanka ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Density Functional ◽  
Rational Design ◽  
Iron Catalyst ◽  
High Current Density ◽  
Density Functional Theory Calculations ◽  
High Energy ◽  
Faradaic Efficiency ◽  
High Energy Barrier ◽  
Linear Configuration

A rational design of an electrocatalyst presents a promising avenue for solar fuels synthesis from carbon dioxide (CO2) fixation but is extremely challenging. Herein, we use density functional theory calculations to study an inexpensive binary copper−iron catalyst for photoelectrochemical CO2 reduction toward methane. The calculations of reaction energetics suggest that Cu and Fe in the binary system can work in synergy to significantly deform the linear configuration of CO2 and reduce the high energy barrier by stabilizing the reaction intermediates, thus spontaneously favoring CO2 activation and conversion for methane synthesis. Experimentally, the designed CuFe catalyst exhibits a high current density of −38.3 mA⋅cm−2 using industry-ready silicon photoelectrodes with an impressive methane Faradaic efficiency of up to 51%, leading to a distinct turnover frequency of 2,176 h−1 under air mass 1.5 global (AM 1.5G) one-sun illumination.

scholarly journals Synthesis and Evaluation of Copper-Supported Titanium Oxide Nanotubes as Electrocatalyst for the Electrochemical Reduction of Carbon Oxide to Organics

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 298 ◽  
Author(s):  
SK Hossain ◽  
Junaid Saleem ◽  
SleemUr Rahman ◽  
Syed Zaidi ◽  
Gordon McKay ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Titanium Oxide ◽  
Hydrothermal Process ◽  
Gas Diffusion ◽  
Solid Polymer ◽  
Precipitation Method ◽  
Cathode Side ◽  
Faradaic Efficiency ◽  
Support Materials ◽  
Titanium Oxide Nanotubes

Carbon dioxide (CO2) is considered as the prime reason for the global warming effect and one of the useful ways to transform it into an array of valuable products is through electrochemical reduction of CO2 (ERC). This process requires an efficient electrocatalyst with high faradaic efficiency at low overpotential and enhanced reaction rate. Herein, we report an innovative way of reducing CO2 using copper-metal supported on titanium oxide nanotubes (TNT) electrocatalysts. The TNT support material was synthesized using alkaline hydrothermal process with Degussa (P-25) as a starting material. Copper nanoparticles were anchored on the TNT by homogeneous deposition-precipitation method (HDP) with urea as precipitating agent. The prepared catalysts were tested in a home-made H-cell with 0.5 M NaHCO3 aqueous solution in order to examine their activity for ERC and the optimum copper loading. Continuous gas-phase ERC was carried out in a solid polymer electrolyte (SPE) reactor. The 10% Cu/TNT catalysts were employed in the gas diffusion layer (GDL) on the cathode side with Pt-Ru/C on the anode side. Faradaic efficiencies for the three major products namely methanol, methane, and CO were found to be 4%, 3%, and 10%, respectively at −2.5 V with an overall current density of 120 mA/cm2. The addition of TNT significantly increased the catalytic activity of electrocatalyst for ERC. It is mainly attributed to their better stability towards oxidation, increased CO2 adsorption capacity and stabilization of the reaction intermediate, layered titanates, and larger surface area (400 m2/g) as compared with other support materials. Considering the low cost of TNT, it is anticipated that TNT support electrocatalyst for ECR will gain popularity.

Zn(II) porphyrin-based photocatalytic synthesis of Cu nanoparticles for electrochemical reduction of CO2

2018 ◽  
Vol 22 (05) ◽  
pp. 406-412 ◽  
Author(s):  
Siyu Zhang ◽  
Xue Zhang ◽  
Huiyuan Liu ◽  
Yang Lv ◽  
Zhongjun Hou ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Gas Chromatography ◽  
Electrochemical Reduction ◽  
Copper Nanoparticles ◽  
Linear Sweep Voltammetry ◽  
Cu Nanoparticles ◽  
Linear Sweep ◽  
Acid Sodium Salt ◽  
Reduction Of Co2 ◽  
Photocatalytic Synthesis

Copper nanoparticles frequently exhibit unique electrocatalytic activity for the electrochemical reduction of carbon dioxide. However, the synthesis of Cu nanoparticles in aqueous systems remains rare. Herein, we report the synthesis of copper nanoparticles by using a zinc(II) porphyrin-based photocatalytic method in the presence of polyacrylic acid sodium salt (PAA) in water under visible light irradiation, leading to a series of Cu nanoparticles with relatively small average sizes ranging from 69 to 97 nm. PAA molecules adsorbed on Cu nanoparticles were simply removed by washing with copious amount of water. The purified Cu nanoparticles show some activity toward the electrochemical reduction of carbon dioxide as evidenced by linear sweep voltammetry (LSV) and gas chromatography (GC).

scholarly journals Computational studies of ionic liquids as co-catalyst for CO2 electrochemical reduction to produce syngas using COSMO-RS

2021 ◽  
Vol 287 ◽  
pp. 02016
Author(s):  
Sulafa Abdalmageed Saadaldeen Mohammed ◽  
Wan Zaireen Nisa Yahya ◽  
Mohamad Azmi Bustam
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Electrochemical Reduction ◽  
High Current Density ◽  
Value Added ◽  
Chemical Calculation ◽  
Hydrogen Bond Energy ◽  
Faradaic Efficiency ◽  
Co Catalyst ◽  
Main Challenge

Transforming carbon dioxide (CO2) into value-added products through electrochemical reduction reaction (CO2ERR) is a promising technique due to its potential advantages using renewable energy. The main challenge is to find a stable catalytic system that could minimize the reaction overpotential with high faradaic efficiency and high current density. Ionic liquids (ILs) as electrolyte in CO2ERR have attracted attention due to the advantages of their unique properties in enhancing catalytic efficiency. For better performance, a systematic understanding of the role of ILs as electrocatalyst is needed. Therefore, this paper aims to correlate the performance of ILs as co-catalyst in (CO2ERR) with the lowest unoccupied molecular orbital (LUMO) energy level and the interaction energy as predicted by quantum chemical calculation using Conductor like Screening Model for Real Solvents (COSMO-RS) and Turbomole. The results show strong linearity (R2=0.98) between hydrogen bond energy (HB) and LUMO values. It is demonstrated that as HB increases, the LUMO value decreases, and the catalytic activity for CO2ERR also increases. This result allows further understanding on the correlation between the molecular structure and the catalytic activity for CO2ERR. It can serve as a priori prediction to aid in the design of new effective catalysts.

Comparison of Au, Ag Electrode in Carbon Dioxide Electrochemical Reduction under the same Condition

2013 ◽  
Vol 781-784 ◽  
pp. 362-366
Author(s):  
Xiao Chun Wang ◽  
You Jian Jia ◽  
Feng Shi ◽  
Jin Shi
Keyword(s):  
Carbon Dioxide ◽  
Aqueous Solution ◽  
Catalytic Activity ◽  
Electrochemical Reduction ◽  
Electrolysis Cell ◽  
Electrochemical System ◽  
Transition Elements ◽  
Metal Electrodes ◽  
Faradaic Efficiency ◽  
Ag Electrode

The electrochemical reduction of carbon dioxide (CO2) has been studied on various metal electrodes including main group and transition elements in aqueous solution. Of these electrodes, silver and gold are found to have catalytic activity for the conversion of CO2 to CO with considerably high Faradaic efficiencies. However, no work has been done to evaluate the electrocatalytical property of these two electrodes in the same electrochemical system under the same condition. In present work, we investicate the electrocatalytical property of Ag and Au electrodes in the same electrolysis cell and under the same condition. We found Au electrode exhibits higher current density and higher faradaic efficiency for CO formation than Ag electrode.

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