scholarly journals Biomimetic Approach to CO2 Reduction

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Ilaria Gamba
Keyword(s):  
Catalytic Activity ◽  
Transition Metal Complexes ◽  
Co2 Reduction ◽  
Solar Fuels ◽  
Molecular Systems ◽  
Biomimetic Approach ◽  
Artificial Photosynthetic ◽  
Molecular Catalysts ◽  
Structural Aspects

The development of artificial photosynthetic technologies able to produce solar-fuels from CO2 reduction is a fundamental task that requires the employment of specific catalysts being accomplished. Besides, effective catalysts are also demanded to capture atmospheric CO2, mitigating the effects of its constantly increasing emission. Biomimetic transition metal complexes are considered ideal platforms to develop efficient and selective catalysts to be implemented in electrocatalytic and photocatalytic devices. These catalysts, designed according to the inspiration provided by nature, are simple synthetic molecular systems capable of mimic features of the enzymatic activity. The present review aims to focus the attention on the mechanistic and structural aspects highlighted to be necessary to promote a proper catalytic activity. The determination of these characteristics is of interest both for clarifying aspects of the catalytic cycle of natural enzymes that are still unknown and for developing synthetic molecular catalysts that can readily be applied to artificial photosynthetic devices.

Hybrid Artificial Photosynthetic Systems Constructed by Quantum Dots and Molecular Catalysts for Solar Fuels Production: Development and Advances

2021 ◽  
Author(s):  
Feng Wang ◽  
Jing Liu ◽  
Ying-Yi Ren ◽  
Jin Wu ◽  
Wu Xia ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Quantum Dots ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Carbon Dioxide Reduction ◽  
Reduction Reaction ◽  
Solar Fuels ◽  
Production Development ◽  
Artificial Photosynthetic ◽  
Molecular Catalysts

The construction of artificial photosynthetic (AP) systems for hydrogen evolution reaction (HER) and carbon dioxide reduction reaction (CRR) is one of the hottest topics in the field of energy and...

Complexes of transition metals bonded to silica via β-diketonate groups — synthesis, structure, and catalytic activity

2008 ◽  
Vol 62 (3) ◽  
Author(s):  
Iwona Rykowska ◽  
Włodzimierz Urbaniak
Keyword(s):  
Gas Chromatography ◽  
Catalytic Activity ◽  
Transition Metal Complexes ◽  
Silica Surface ◽  
Nickel Complexes ◽  
Complexes Of Transition Metals ◽  
Complexation Gas Chromatography ◽  
Immobilized Complexes ◽  
Metal Complex Catalysts

AbstractTransition metal complexes bonded to silica via silanes with β-diketonate groups can be used as packings for complexation gas chromatography or as immobilized homogenous metal complex catalysts. On basis of elemental analysis and the determination of surface area, possible structures of the complexes formed on the silica surface have been proposed. The possibility of using the immobilized complexes as catalysts has been indicated. Especially nickel complexes were taken into consideration. These immobilized complexes were used previously as packings for complexation gas chromatography.

An NADH-Inspired Redox Mediator Strategy to Promote Second-Sphere Electron and Proton Transfer for Cooperative Electrochemical CO2 Reduction Catalyzed by Iron Porphyrin

2020 ◽  
Author(s):  
Peter T. Smith ◽  
Sophia Weng ◽  
Christopher Chang
Keyword(s):  
Proton Transfer ◽  
Co2 Reduction ◽  
Iron Porphyrin ◽  
Redox Mediators ◽  
Reservoir Properties ◽  
Proton Reduction ◽  
Electrochemical Co2 Reduction ◽  
Starting Point ◽  
Rate Improvement ◽  
Molecular Catalysts

We present a bioinspired strategy for enhancing electrochemical carbon dioxide reduction catalysis by cooperative use of base-metal molecular catalysts with intermolecular second-sphere redox mediators that facilitate both electron and proton transfer. Functional synthetic mimics of the biological redox cofactor NADH, which are electrochemically stable and are capable of mediating both electron and proton transfer, can enhance the activity of an iron porphyrin catalyst for electrochemical reduction of CO<sub>2</sub> to CO, achieving a 13-fold rate improvement without altering the intrinsic high selectivity of this catalyst platform for CO<sub>2</sub> versus proton reduction. Evaluation of a systematic series of NADH analogs and redox-inactive control additives with varying proton and electron reservoir properties reveals that both electron and proton transfer contribute to the observed catalytic enhancements. This work establishes that second-sphere dual control of electron and proton inventories is a viable design strategy for developing more effective electrocatalysts for CO<sub>2</sub> reduction, providing a starting point for broader applications of this approach to other multi-electron, multi-proton transformations.

Host-Guest Interactions on Electrode Surfaces for Immobilization of Molecular Catalysts

2020 ◽  
Author(s):  
Laurent Sévery ◽  
Jacek Szczerbiński ◽  
Mert Taskin ◽  
Isik Tuncay ◽  
Fernanda Brandalise Nunes ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Heterogeneous Systems ◽  
Catalytic Systems ◽  
New Approach ◽  
Molecular Systems ◽  
Electrode Surfaces ◽  
Catalytic Surfaces ◽  
Oxide Electrodes ◽  
The Stability ◽  
Molecular Catalysts

The strategy of anchoring molecular catalysts on electrode surfaces combines the high selectivity and activity of molecular systems with the practicality of heterogeneous systems. The stability of molecular catalysts is, however, far less than that of traditional heterogeneous electrocatalysts, and therefore a method to easily replace anchored molecular catalysts that have degraded could make such electrosynthetic systems more attractive. Here, we apply a non-covalent “click” chemistry approach to reversibly bind molecular electrocatalysts to electrode surfaces via host-guest complexation with surface-anchored cyclodextrins. The host-guest interaction is remarkably strong and allows the flow of electrons between the electrode and the guest catalyst. Electrosynthesis in both organic and aqueous media was demonstrated on metal oxide electrodes, with stability on the order of hours. The catalytic surfaces can be recycled by controlled release of the guest from the host cavities and readsorption of fresh guest. This strategy represents a new approach to practical molecular-based catalytic systems.

scholarly journals Powering the next industrial revolution: transitioning from nonrenewable energy to solar fuels via CO2 reduction

RSC Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 87-113
Author(s):  
Rami J. Batrice ◽  
John C. Gordon
Keyword(s):  
Solar Energy ◽  
Fossil Fuels ◽  
Industrial Revolution ◽  
Co2 Reduction ◽  
Solar Fuels ◽  
Chemical Bonds ◽  
Direct Production ◽  
Promising Alternative ◽  
Nonrenewable Energy

Solar energy has been used for decades for the direct production of electricity in various industries and devices. However, harnessing and storing this energy in the form of chemical bonds has emerged as a promising alternative to fossil fuels.

Determination of surface composition of alloy nanoparticles and relationships with catalytic activity in Pd–Cu/SiO2 cogelled xerogel catalysts

2004 ◽  
Vol 270 (1-2) ◽  
pp. 201-208 ◽  
Author(s):  
Stéphanie Lambert ◽  
Benoı̂t Heinrichs ◽  
Alain Brasseur ◽  
André Rulmont ◽  
Jean-Paul Pirard
Keyword(s):  
Catalytic Activity ◽  
Surface Composition ◽  
Alloy Nanoparticles

CO2 reduction catalysis by tunable square-planar transition-metal complexes: a theoretical investigation using nitrogen-substituted carbon nanotube models

2017 ◽  
Vol 19 (43) ◽  
pp. 29068-29076 ◽  
Author(s):  
Yu-Te Chan ◽  
Ming-Kang Tsai
Keyword(s):  
Density Functional Theory ◽  
Carbon Nanotube ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Density Functional ◽  
Co2 Reduction ◽  
Functional Theory ◽  
Square Planar ◽  
Planar Transition

The CO2 reduction capabilities of transition-metal-chelated nitrogen-substituted carbon nanotube models (TM-4N2v-CNT, TM = Fe, Ru, Os, Co, Rh, Ir, Ni, Pt or Cu) are characterized by density functional theory.

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