A Comprehensive Review on Graphitic Carbon Nitride for Carbon Dioxide Photoreduction

Small Methods, Journal Year: 2022, Volume and Issue: 6(12)

Published: Nov. 6, 2022

Inspired by natural photosynthesis, harnessing the wide range of solar energy and utilizing appropriate semiconductor-based catalysts to convert carbon dioxide into beneficial species, for example, CO, CH4 , HCOOH, CH3 COH have been shown be a sustainable more environmentally friendly approach. Graphitic nitride (g-C3 N4 ) has regarded as highly effective photocatalyst CO2 reduction reaction, owing its cost-effectiveness, high thermal chemical stability, visible light absorption capability, low toxicity. However, weaker electrical conductivity, fast recombination rate, smaller window, reduced surface area make this catalytic material unsuitable commercial photocatalytic applications. Therefore, certain procedures, including elemental doping, structural modulation, functional group adjustment g-C3 addition metal complex motif, others, may used improve activity towards reduction. This review investigated scientific community's perspectives on synthetic pathways optimization approaches increase selectivity efficiency -based hybrid structures, well their benefits drawbacks Finally, concludes comparative discussion presents promising picture future scope improvements.

Language: Английский

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Tandem Electrocatalytic–Thermocatalytic Reaction Scheme for CO₂ Conversion to C₃ Oxygenates

ACS Energy Letters, Journal Year: 2022, Volume and Issue: 7(9), P. 2904 - 2910

Published: Aug. 10, 2022

A two-step tandem electrochemical–thermochemical reaction scheme is demonstrated to convert CO2 into value-added C3 oxygenate molecules: was electrochemically reduced ethylene, CO, and H2, followed by the thermochemical hydroformylation produce 1-propanol propanal. The electrolyzer evaluated with Cu catalysts containing different oxidation states modifications gas diffusion layer hydrophobicity, while reactor tested over a Rh1Co3/MCM-41 catalyst. In situ X-ray absorption spectroscopy showed minimal changes Rh in electrochemical reactions, respectively. configuration achieved total product selectivity (on basis of CO2) ∼18%, representing 4-fold improvement compared direct conversion flow cells. Additionally, scaled 25 cm2 device enhance production rate up 11.8 μmol min–1 demonstrate potential scalability system.

Language: Английский

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Porous carbon materials for CO2 capture, storage and electrochemical conversion

Materials Reports Energy, Journal Year: 2023, Volume and Issue: 3(2), P. 100199 - 100199

Published: April 28, 2023

Continuous accumulation and emission into the atmosphere of anthropogenic carbon dioxide (CO2), a major greenhouse gas, has been recognized as primary contributor to climate change associated with global warming acidification oceans. This led drastic changes in natural ecosystem, hence an unhealthy ecological environment for human society. Thus, effective mitigation ever increasing CO2 most important challenge. To achieve zero footprint, novel materials approaches are required potentially reducing release, while our current fossil-fuel-based energy must be replaced by renewable free from emissions. In this paper, porous carbons hierarchical pore structures promising adsorption electrochemical reduction owing their high specific surface area, excellent catalytic performance, low cost long-term stability. Since efficient gas-phased (electro)catalysis involves access reactants active sites at gas-liquid-solid triple phase, possess multiple advantages various CO2-related applications enhanced volumetric gravimetric activities (e.g., uptake density) practical operations. Recent studies have demonstrated that exhibited notable adsorbents provided facile conducting pathways mass diffusion channels even under operation conditions. Herein, we summarize recent advances capture, storage, conversion. Prospectives challenges on rational design scalable capture conversion also discussed.

Language: Английский

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Promoting Electrocatalytic CO₂ Reduction to CH₄ by Copper Porphyrin with Donor–Acceptor Structures

Small, Journal Year: 2022, Volume and Issue: 19(4)

Published: Nov. 24, 2022

Molecular catalysts have been receiving increasingly attention in the electrochemical CO2 reduction reaction (CO2 RR) with attractive features such as precise catalytic sites and tunable ligands. However, insufficient activity low selectivity of deep products restrain utilization molecular RR. Herein, a donor-acceptor modified Cu porphyrin (CuTAPP) is developed, which amino groups are linked to donate electrons toward central CuN4 site enhance RR activity. The CuTAPP catalyst exhibited an excellent -to-CH4 electroreduction performance, including high CH4 partial current density 290.5 mA cm-2 corresponding Faradaic efficiency 54.8% at -1.63 V versus reversible hydrogen electrode flow cells. Density functional theory calculations indicated that presented much lower energy gap pathway producing *CHO than without group modification. This work suggests useful strategy introducing designed structures into for enhancing conversion products.

Language: Английский

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Advanced Catalyst Design and Reactor Configuration Upgrade in Electrochemical Carbon Dioxide Conversion

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(52)

Published: Aug. 20, 2023

Abstract Electrochemical carbon dioxide reduction reaction (CO 2 RR) driven by renewable energy shows great promise in mitigating and potentially reversing the devastating effects of anthropogenic climate change environmental degradation. The simultaneous synthesis energy‐dense chemicals can meet global demand while decoupling emissions from economic growth. However, development CO RR technology faces challenges catalyst discovery device optimization that hinder their industrial implementation. In this contribution, a comprehensive overview current state research is provided, starting with background motivation for technology, followed fundamentals evaluated metrics. Then underlying design principles electrocatalysts are discussed, emphasizing structure–performance correlations advanced electrochemical assembly cells increase selectivity throughput. Finally, review looks to future identifies opportunities innovation mechanism discovery, material screening strategies, assemblies move toward carbon‐neutral society.

Language: Английский

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