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...

Electrocatalytic reduction of CO2to CO with 100% faradaic efficiency by using pyrolyzed zeolitic imidazolate frameworks supported on carbon nanotube networks

2017 ◽  
Vol 5 (47) ◽  
pp. 24867-24873 ◽  
Author(s):  
Ying Guo ◽  
Huijuan Yang ◽  
Xin Zhou ◽  
Kunlong Liu ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electrochemical Reduction ◽  
Electrocatalytic Reduction ◽  
Zeolitic Imidazolate Frameworks ◽  
Faradaic Efficiency ◽  
Carbon Nanotube Networks

100% faradaic efficiency is achieved in electrochemical reduction of CO2to COviacoupling between ZIFs and CNTs.

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%.

scholarly journals Promoting ethylene production over a wide potential window on Cu crystallites induced and stabilized via current shock and charge delocalization

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hao Sun ◽  
Ling Chen ◽  
Likun Xiong ◽  
Kun Feng ◽  
Yufeng Chen ◽  
...  
Keyword(s):  
Metal Ion ◽  
Density Functional ◽  
Metal Organic Framework ◽  
Density Functional Theory Calculations ◽  
Catalyst Design ◽  
Potential Range ◽  
Efficient Manner ◽  
Faradaic Efficiency ◽  
Charge Delocalization ◽  
Wide Potential

AbstractElectrochemical CO2 reduction (CO2RR) in a product-orientated and energy-efficient manner relies on rational catalyst design guided by mechanistic understandings. In this study, the effect of conducting support on the CO2RR behaviors of semi-conductive metal-organic framework (MOF) — Cu3(HITP)2 are carefully investigated. Compared to the stand-alone MOF, adding Ketjen Black greatly promotes C2H4 production with a stabilized Faradaic efficiency between 60-70% in a wide potential range and prolonged period. Multicrystalline Cu nano-crystallites in the reconstructed MOF are induced and stabilized by the conducting support via current shock and charge delocalization, which is analogous to the mechanism of dendrite prevention through conductive scaffolds in metal ion batteries. Density functional theory calculations elucidate that the contained multi-facets and rich grain boundaries promote C–C coupling while suppressing HER. This study underlines the key role of substrate-catalyst interaction, and the regulation of Cu crystalline states via conditioning the charge transport, in steering the CO2RR pathway.

scholarly journals Colloidal ReO3 Nanocrystals: Extra Re d-Electron Instigating a Plasmonic Response

2019 ◽  
Author(s):  
Sandeep Ghosh ◽  
Hsin-Che Lu ◽  
Shin Hum Cho ◽  
Thejaswi Maruvada ◽  
Murphie C. Price ◽  
...  
Keyword(s):  
Ligand Exchange ◽  
Bulk Material ◽  
Optical Modulation ◽  
Colloidal Synthesis ◽  
Localized Surface Plasmon ◽  
Potential Range ◽  
Absorption Bands ◽  
Polar Solvents ◽  
Free Electron Density ◽  
Wide Potential

<div><div><div><p>Rhenium (+6) oxide (ReO3) is metallic in nature, which means it can sustain localized surface plasmon resonance (LSPR) in its nanocrytalline form. Herein, we describe the colloidal synthesis of nanocrystals (NCs) of this compound, through a hot-injection route entail- ing the reduction of rhenium (+7) oxide with a long chain ether. This synthetic protocol is fundamentally different from the more widely em- ployed nucleophilic lysing of metal alkylcarboxylates for other metal oxide NCs. Owing to this difference, the NC surfaces are populated by ether molecules through an L-type coordination along with covalently bound (X-type) hydroxyl moieties, which enables easy switching from nonpolar to polar solvents without resorting to cumbersome ligand exchange procedures. These as-synthesized NCs exhibit absorption bands at around 590 nm (≈2.1 eV) and 410 nm (≈3 eV), which were respectively ascribed to their LSPR and interband absorptions by Mie theory simulations and Drude modeling. The LSPR response arises from the oscillation of free electron density created by the extra Re d-electron per ReO3 unit in the NC lattice, which resides in the conduction band. Further, the LSPR contribution facilitates the observation of dynamic optical modulation of the NC films as they undergo progressive electrochemical charging via ion (de)insertion. Ion (de)insertion leads to distinct dynamic optical signatures, and these changes are reversible in a wide potential range depending on the choice of the ion (lithium or tetrabu- tylammonium). Nanostructuring in ReO3 and the description of the associated plasmonic properties of these NCs made this optical modulation feasible, which were hitherto not reported for the bulk material. We envisage that the synthetic protocol described here will facilitate further exploration of such applications and fundamental studies of these plasmonic NCs</p></div></div></div>

Ambient NH3 synthesis via electrochemical reduction of N2 over cubic sub-micron SnO2 particles

2018 ◽  
Vol 54 (92) ◽  
pp. 12966-12969 ◽  
Author(s):  
Ling Zhang ◽  
Xiang Ren ◽  
Yonglan Luo ◽  
Xifeng Shi ◽  
Abdullah M. Asiri ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Carbon Cloth ◽  
Faradaic Efficiency ◽  
Ambient Nh3

Cubic sub-micron SnO2 particles on carbon cloth (SnO2/CC) are active for electrocatalytic N2 reduction, with a large NH3 yield of 1.47 × 10−10 mol s−1 cm−2 and a high Faradaic efficiency of 2.17%.

Facile, cost-effective plasma synthesis of self-supportive FeSx on Fe foam for efficient electrochemical reduction of N2 under ambient conditions

2019 ◽  
Vol 7 (34) ◽  
pp. 19977-19983 ◽  
Author(s):  
Wei Xiong ◽  
Zheng Guo ◽  
Shijun Zhao ◽  
Qian Wang ◽  
Qiyong Xu ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Electrochemical Reduction ◽  
Production Rate ◽  
Low Cost ◽  
Cost Effective ◽  
Plasma Synthesis ◽  
Ambient Conditions ◽  
Faradaic Efficiency

A non-precious, self-supportive FeSx NRR electrocatalyst was synthesized by a simple H2S-plasma treatment on low-cost Fe foam, which shows a remarkable NH3 production rate of 4.13 × 10−10 mol s−1 cm−2 and a high faradaic efficiency of 17.6%.

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.

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