Related references
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Review
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Xinning Song et al.
Summary: Utilizing CO2 for producing fuels and chemicals has advantages of abundance, non-toxicity, and economy. However, the complex reaction process of multi-electronic products makes it challenging to achieve high selectivity, current density, overpotential, and stability simultaneously. In situ/operando characterization techniques have played an important role in understanding the reaction pathway of CO2RR. This mini-review discusses recent progress on in situ/operando characterizations, including microscopy, infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, and X-ray absorption fine spectroscopy, and addresses the capabilities and challenges of these techniques.
SCIENCE CHINA-CHEMISTRY
(2023)
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Xupeng Yan et al.
Summary: Electrochemical reduction of CO2 by renewable electricity is a promising method for reducing greenhouse gases and achieving carbon neutrality. Cu-based catalysts have unique catalytic activity in CO2 electroreduction, and F-doped Cu catalysts can improve C2+ products.
Review
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Quansong Zhu et al.
Summary: This perspective summarizes recent advances and opportunities using surface ligands to enhance the performance of nanocatalysts for electrochemical CO2 reduction. Several mechanisms are discussed, including selective permeability, modulating interfacial solvation structure and electric fields, chemical activation, and templating active site selection.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
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Yongzhi Zhong et al.
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Article
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Yabo Wang et al.
Summary: In this study, a method for achieving selective CO2 reduction reaction in aqueous solutions was reported, using covalent cobalt porphyrin polymers with electronically fine-tuned structures. Experimental results showed that the CO2 reduction reaction selectivity of the cobalt porphyrin polymers was significantly improved by tuning the electronic structures.
Article
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Yuan Zhao et al.
Summary: The study utilized an anti-swelling anion exchange ionomer (AEI) to optimize the local environment for CO2 electroreduction to C2+ products, achieving higher C2+ selectivity. In situ measurements showed that the anti-swelling backbone and N(CH3)(3)(+) groups synergistically regulated the local pH level and water content, leading to enhanced C2+ production. The anti-swelling AEI-modified catalyst demonstrated improved Faradaic efficiency and power conversion efficiency compared to most reported powder catalysts.
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Wei Liu et al.
Summary: In this study, a facile and scalable anodic corrosion method was used to synthesize oxygen-rich CuO nanoplate arrays. The self-evolution process led to the formation of stable Cu/Cu2O heterogeneous interfaces, which significantly improved the C2H4 production and stability in CO2 electroreduction.
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Janis Timoshenko et al.
Summary: This study reveals the complexity of CO2RR catalysts under dynamic reaction conditions using operando X-ray absorption and X-ray diffraction methods. By employing a pulsed reaction protocol, the effect of copper species on product distribution is decoupled, resulting in an increase in ethanol production.
Article
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Hao-Lin Zhu et al.
Summary: In this study, a stable pi-pi stacking framework was reported for electrochemical CO2 reduction, showing impressive performance with high Faradaic efficiency for C2+ products. In-situ infrared spectroscopy, density functional theory calculations, and control experiments revealed the mechanism of hydrogenation and C-C coupling in this framework.
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(2022)
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Yu Zhang et al.
Summary: Tandem electrocatalysis is an effective approach for CO2 conversion to multicarbon products. However, the mass-transport limitation of CO hampers high-rate production of C2+ products. In this study, a CuO/Ni single atoms tandem catalyst was designed, enabling in-situ generation and rapid consumption of CO, leading to high partial current density and excellent selectivities for C2+ products.
Article
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Fei Hu et al.
Summary: A unique catalyst based on CuTi alloy has been developed for efficient electrocatalytic CO2 reduction to multicarbon liquid fuels, achieving high C2-4 Faradaic efficiency and long-term stability. Subsurface Ti atoms increase the electron density of surface Cu sites, enhancing the adsorption of CO intermediates and reducing energy barriers for CO dimerization and trimerization.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
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Yong Yang et al.
Summary: In this study, a Re-based tricarbonyl catalyst Re1 with a spiro center and a phenol group was reported, which showed improved stability due to the large steric spiro group. The phenol group in the second coordination sphere promoted the protonation of CO2 reduction intermediates, enhancing the electrocatalytic CO2 reduction activity of Re1. Mechanistic studies revealed that the doubly reduced complex Re1b was active for CO2 addition.
CHINESE JOURNAL OF CHEMISTRY
(2021)
Review
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Jiali Wang et al.
Summary: Research has revealed the critical impact of dynamic chemical states on CO2RR selectivity, providing new insights for fundamental understanding and efficient electrocatalyst design.
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(2021)
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Lei Zhang et al.
Summary: Cu(I)-based catalysts are essential for the electrocatalytic CO2 reduction, and in this study, two stable copper(I)-based catalysts with inherent cuprophilic interactions were synthesized for highly selective CO2-to-CH4 conversion. The substitution of sulfate radicals with hydroxyl radicals led to a dynamic crystal structure transition, enhancing the cuprophilic interactions inside the catalyst structure. The enhanced cuprophilic interactions in NNU-33(H) showed outstanding CH4 selectivity, representing the best crystalline catalyst for electrocatalytic CO2-to-CH4 conversion.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
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Jian-Heng Ye et al.
Summary: Carbon dioxide is a valuable carbon resource in organic synthesis, but its utilization is challenging due to stability and inertness. Researchers have developed radical-type carboxylations and cyclizations using visible-light photoredox catalysis and copper catalysis. These strategies have expanded the scope of CO2 transformations and provided new methods for selective organic synthesis.
ACCOUNTS OF CHEMICAL RESEARCH
(2021)
Review
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Changlong Xiao et al.
Summary: Electrochemical conversion of CO2 to value-added chemicals and fuels using Cu catalysts has shown promising potential, but poor product selectivity remains a major technical challenge for global applications. Tailoring the electrocatalyst architecture through nanotechnology principles can significantly impact the adsorption energetics of key intermediates and reaction pathways.
Review
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Manoj B. Kale et al.
Summary: Extensive research has been conducted in synthesizing catalysts for energy conversion applications due to the conventional environment polluting energy sources and the continuous growing energy demand. This review focuses on the application of various electrodeposition methods in the synthesis of energy-related electrocatalyst and discusses different electrocatalyst characterization techniques briefly. The influence of various parameters on the electrocatalyst activity and stability is highlighted.
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(2021)
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Yuhang Wang et al.
Summary: The review highlights the recent advances in Cu-catalyzed CO2 electroreduction, focusing on catalyst design and strategies to promote key steps. Challenges in understanding reaction mechanisms and real-time investigations are also addressed.
ADVANCED MATERIALS
(2021)
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Xintong Yuan et al.
Summary: This study aims to enhance the CO2ER performance by increasing the synergism of Cu-0-Cu+ pairs, where Cu-0 activates CO2 molecules and facilitates electron transfer, while Cu+ strengthens *CO adsorption to further promote C-C coupling.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
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Chanyeon Kim et al.
Summary: The authors investigated and optimized the microenvironment near the copper catalyst surface using bilayer ionomer coatings to improve the efficiency of CO2 reduction. By tailoring the microenvironment and coupling it with pulsed electrolysis, higher local CO2/H2O ratio and pH values are achieved, leading to selective C2+ production.
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Xiao-Feng Qiu et al.
Summary: In this study, a metal-organic framework (PcCu-Cu-O) was reported as an electrocatalyst for converting CO2 to C2H4, showing higher efficiency compared to discrete molecular copper-phthalocyanine. In-situ infrared spectroscopy and control experiments indicated that the synergistic effect between the CuPc unit and the CuO4 unit contributes to lowering the energy barrier for C-C dimerization.
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Hyo Sang Jeon et al.
Summary: This study utilized a pulsed CO2 electroreduction reaction approach to adjust product distribution in a gas-fed flow cell for industrially relevant current densities. By comparing the selectivity of Cu catalysts under potentiostatic and pulsed electrolysis conditions, it was found that the enhanced product selectivity in the latter case can be attributed to structural modifications and local pH effects. The differences in catalyst selectivity were observed to influence the formation of specific products, such as C-2 and CH4, through morphological reconstruction and consumption of OH - species near the catalyst surface.
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Weiwei Guo et al.
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Jianan Erick Huang et al.
Summary: Carbon dioxide electroreduction (CO2R) is being actively studied as a promising route to convert carbon emissions to valuable chemicals and fuels. A study found that concentrating potassium cations in the vicinity of electrochemically active sites accelerates CO2 activation to enable efficient CO2R in acid. The research achieved a high CO2R efficiency on copper at pH <1 with a single-pass CO2 utilization of 77%.
Review
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Chang Liu et al.
Summary: This review discusses recent progress in enhancing Cu-based electrocatalysts for CO2 electroreduction. Strategies such as oxidation pre-treatment, heteroatom doping, morphological control, and surface modification have been explored to improve the performance of Cu-based catalysts. By rational design, practical CO2 electrolyzer development can be advanced for a sustainable future.
SCIENCE CHINA-CHEMISTRY
(2021)
Article
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Ji-Yong Kim et al.
Summary: Surface reconstruction of electrocatalysts is important for converting carbon dioxide to value-added chemical products. In this study, stable CO2 to C2H4 conversion is achieved by using copper nanoparticles protected by self-formed quasi-graphitic carbon shell.
NATURE COMMUNICATIONS
(2021)
Article
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Hao-Lin Zhu et al.
Summary: In this study, a Cu-based metal-organic framework was introduced as a catalyst for the efficient and selective reduction of CO2 to CH4. The in situ-generated trigonal pyramidal Cu(I)N-3 was identified as the electrochemical active site, while the hydrogen-bonding interactions of adjacent aromatic hydrogen atoms played a key role in stabilizing key intermediates of carbon dioxide reduction and inhibiting the hydrogen evolution reaction, demonstrating a high performance in electroreduction of CO2 to CH4.
Article
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Qikui Fan et al.
Summary: A seed-assisted strategy for preparing Cu nanoparticles with PVP capping is presented in this study. The Cu NPs with sufficient PVP exhibit Cu-0 species, while those with deficient PVP form an oxide structure. Utilizing a flow cell configuration, Cu NPs deliver high Faradaic efficiencies for the CO2 reduction to CH4, outperforming many reported CO2 electrocatalysts. The presence of multicarbon products also demonstrates the crucial role of surface oxidation of Cu species in the CO2RR.
ADVANCED ENERGY MATERIALS
(2021)
Review
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Rileigh Casebolt et al.
Summary: Research has shown that pulsed potential electrochemical CO2 reduction is crucial in increasing electrolyzer durability and product selectivity, providing scientific and technological opportunities for electrochemical technologies beyond CO2 reduction.
Review
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Wenchao Ma et al.
Summary: This tutorial review explores the electrocatalytic reduction of CO2 with H2O to multi-carbon (C2+) compounds, focusing on the similarities and differences in the electrocatalytic CO2 and CO reduction reactions (CO2RR and CORR) into C2+ compounds over Cu-based catalysts. It discusses fundamental aspects, reaction mechanisms, efficient catalysts, and key factors determining selectivity, activity, and stability. Opportunities, challenges, and future trends in the electrocatalytic CO2RR and CORR are also highlighted for the synthesis of C2+ olefins and oxygenates.
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(2021)
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Summary: Researchers are exploring the use of metal-organic frameworks (MOFs) as catalysts for CO2 conversion, investigating the relationship between structure and properties, and proposing design strategies to improve catalytic performance. They emphasize pathways to enrich catalytic active sites in MOF structures and discuss synergistic effects between active sites.
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