Water nanodomain for efficient photocatalytic CO2 reduction to CO

2021 ◽  
Author(s):  
Gang Chen ◽  
Xiuyan Cheng ◽  
Jianling Zhang ◽  
Qiang Wan ◽  
Ran Duan ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Evolution Rate ◽  
Co2 Conversion ◽  
Photocatalytic Co2 Conversion

Herein we propose the utilization of nanosized water domain for photocatalytic CO2 conversion, by which CO2 can be efficiently reduced to CO with CO evolution rate of 682 µmol g-1...

scholarly journals Investigation of Gas Diffusion Electrode Systems for the Electrochemical CO2 Conversion

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 482
Author(s):  
Hilmar Guzmán ◽  
Federica Zammillo ◽  
Daniela Roldán ◽  
Camilla Galletti ◽  
Nunzio Russo ◽  
...  
Keyword(s):  
Carbon Capture ◽  
Active Sites ◽  
Co2 Reduction ◽  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
Catalyst Loading ◽  
Co2 Conversion ◽  
Atmospheric Conditions ◽  
Electrochemical Co2 Reduction ◽  
Liquid Products

Electrochemical CO2 reduction is a promising carbon capture and utilisation technology. Herein, a continuous flow gas diffusion electrode (GDE)-cell configuration has been studied to convert CO2 via electrochemical reduction under atmospheric conditions. To this purpose, Cu-based electrocatalysts immobilised on a porous and conductive GDE have been tested. Many system variables have been evaluated to find the most promising conditions able to lead to increased production of CO2 reduction liquid products, specifically: applied potentials, catalyst loading, Nafion content, KHCO3 electrolyte concentration, and the presence of metal oxides, like ZnO or/and Al2O3. In particular, the CO productivity increased at the lowest Nafion content of 15%, leading to syngas with an H2/CO ratio of ~1. Meanwhile, at the highest Nafion content (45%), C2+ products formation has been increased, and the CO selectivity has been decreased by 80%. The reported results revealed that the liquid crossover through the GDE highly impacts CO2 diffusion to the catalyst active sites, thus reducing the CO2 conversion efficiency. Through mathematical modelling, it has been confirmed that the increase of the local pH, coupled to the electrode-wetting, promotes the formation of bicarbonate species that deactivate the catalysts surface, hindering the mechanisms for the C2+ liquid products generation. These results want to shine the spotlight on kinetics and transport limitations, shifting the focus from catalytic activity of materials to other involved factors.

scholarly journals Improving the Catalytic CO2 Reduction on Cs2AgBiBr6 by Halide Defect Engineering: A DFT Study

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2469
Author(s):  
Pengfei Chen ◽  
Yiao Huang ◽  
Zuhao Shi ◽  
Xingzhu Chen ◽  
Neng Li
Keyword(s):  
Gas Adsorption ◽  
Catalytic Reduction ◽  
Deep Level ◽  
Critical Role ◽  
Co2 Reduction ◽  
First Principles Calculation ◽  
Bandgap Energy ◽  
Practical Implementation ◽  
Co2 Conversion ◽  
Defect Engineering

Pb-free double halide perovskites have drawn immense attention in the potential photocatalytic application, due to the regulatable bandgap energy and nontoxicity. Herein, we first present a study for CO2 conversion on Pb-free halide perovskite Cs2AgBiBr6 under state-of-the-art first-principles calculation with dispersion correction. Compared with the previous CsPbBr3, the cell parameter of Cs2AgBiBr6 underwent only a small decrease of 3.69%. By investigating the adsorption of CO, CO2, NO, NO2, and catalytic reduction of CO2, we found Cs2AgBiBr6 exhibits modest adsorption ability and unsatisfied potential determining step energy of 2.68 eV in catalysis. We adopted defect engineering (Cl doping, I doping and Br-vacancy) to regulate the adsorption and CO2 reduction behavior. It is found that CO2 molecule can be chemically and preferably adsorbed on Br-vacancy doped Cs2AgBiBr6 with a negative adsorption energy of −1.16 eV. Studying the CO2 reduction paths on pure and defect modified Cs2AgBiBr6, Br-vacancy is proved to play a critical role in decreasing the potential determining step energy to 1.25 eV. Finally, we probe into the electronic properties and demonstrate Br-vacancy will not obviously promote the process of catalysis deactivation, as there is no formation of deep-level electronic states acting as carrier recombination center. Our findings reveal the process of gas adsorption and CO2 reduction on novel Pb-free Cs2AgBiBr6, and propose a potential strategy to improve the efficiency of catalytic CO2 conversion towards practical implementation.

Photocatalytic CO2 conversion over single-atom MoN2 sites of covalent organic framework

2021 ◽  
Vol 291 ◽  
pp. 120146
Author(s):  
Mingpu Kou ◽  
Wei Liu ◽  
Yongye Wang ◽  
Jindi Huang ◽  
Yanli Chen ◽  
...  
Keyword(s):  
Single Atom ◽  
Co2 Conversion ◽  
Covalent Organic Framework ◽  
Photocatalytic Co2 Conversion ◽  
Organic Framework

Enhancing CO2 photoreduction over ZIF-based reticular materials by morphology control of Au plasmonic nanoparticles

2022 ◽  
Author(s):  
Jorge Becerra ◽  
Vishnu Nair Gopalakrishnan ◽  
Toan-Anh Quach ◽  
Trong-On Do
Keyword(s):  
Band Structure ◽  
Energy Band ◽  
Co2 Reduction ◽  
Morphology Control ◽  
Energy Band Structure ◽  
Plasmonic Nanoparticles ◽  
Co2 Conversion ◽  
Zeolitic Imidazolate Frameworks ◽  
Co2 Photoreduction ◽  
Proper Energy

Zeolitic imidazolate frameworks (ZIFs) are promising photocatalysts for CO2 reduction due to their proper energy band structure and crystalline properties. However, CO2 conversion is still low due to the serious...

Is water more reactive than H2 in photocatalytic CO2 conversion into fuels using semiconductor catalysts under high reaction pressures?

2017 ◽  
Vol 352 ◽  
pp. 452-465 ◽  
Author(s):  
Hongwei Zhang ◽  
Shogo Kawamura ◽  
Masayuki Tamba ◽  
Takashi Kojima ◽  
Mao Yoshiba ◽  
...  
Keyword(s):  
Co2 Conversion ◽  
High Reaction ◽  
Photocatalytic Co2 Conversion

Photocatalytic CO2 conversion to methanol by Cu2O/graphene/TNA heterostructure catalyst in a visible-light-driven dual-chamber reactor

Nano Energy ◽  
2016 ◽  
Vol 27 ◽  
pp. 320-329 ◽  
Author(s):  
Fei Li ◽  
Li Zhang ◽  
Jincheng Tong ◽  
Yingliang Liu ◽  
Shengang Xu ◽  
...  
Keyword(s):  
Visible Light ◽  
Co2 Conversion ◽  
Dual Chamber ◽  
Visible Light Driven ◽  
Photocatalytic Co2 Conversion

scholarly journals Plasmon-Enhanced Photocatalytic CO2 Conversion within Metal–Organic Frameworks under Visible Light

2016 ◽  
Vol 139 (1) ◽  
pp. 356-362 ◽  
Author(s):  
Kyung Min Choi ◽  
Dohyung Kim ◽  
Bunyarat Rungtaweevoranit ◽  
Christopher A. Trickett ◽  
Jesika Trese Deniz Barmanbek ◽  
...  
Keyword(s):  
Visible Light ◽  
Metal Organic Frameworks ◽  
Co2 Conversion ◽  
Metal Organic ◽  
Photocatalytic Co2 Conversion

scholarly journals Effects of Cr Doping and Water Content on the Crystal Structure Transitions of Ba2In2O5

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1548
Author(s):  
Raphael Finger ◽  
Marc Widenmeyer ◽  
Thomas C. Hansen ◽  
Dirk Wallacher ◽  
Stanislav Savvin ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Water Content ◽  
Structural Changes ◽  
Equimolar Amount ◽  
Co2 Conversion ◽  
Temperature Dependent ◽  
X Ray ◽  
Photocatalytic Co2 Conversion ◽  
Cr Doping

Temperature-dependent crystal structure alterations in the brownmillerite-type material Ba2In2O5 play a fundamental role in its applications: i) photocatalytic CO2 conversion; ii) oxygen transport membranes; and iii) proton conduction. This is connected to a reversible uptake of up an equimolar amount of water. In this study, in situ X-ray and neutron diffraction were combined with Raman spectroscopy and solid-state nuclear magnetic resonance experiments to unravel the effects of Cr doping and water content on the crystal structure transitions of Ba2In2O5(H2O)x over a wide temperature range (10 K ≤ T ≤ 1573 K, x < 1). A mixture of isolated and correlated protons was identified, leading to a highly dynamic situation for the protons. Hence, localisation of the protons by diffraction techniques was not possible. Cr doping led to an overall higher degree of disorder and stabilisation of the tetragonal polymorph, even at 10 K. In contrast, a further disordering at high temperatures, leading to a cubic polymorph, was found at 1123 K. Cr doping in Ba2In2O5 resulted in severe structural changes and provides a powerful way to adjust its physical properties to the respective application.

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