scholarly journals Operando surface chemistry of micro- and nanocubic copper catalysts for electrochemical CO2 reduction

2021 ◽  
Author(s):  
Karla Banjac ◽  
Thanh Hai Phan ◽  
Fernando P. Cometto ◽  
Patrick Alexa ◽  
Yunchang Liang ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Copper Catalysts ◽  
Product Formation ◽  
Atomic Processes ◽  
Renewable Chemicals ◽  
Electrochemical Co2 Reduction ◽  
Tunnelling Microscopy ◽  
Reduction Of Co2 ◽  
Cu Nanostructures

The electrochemical reduction of CO2 (CO2RR) into multicarbon compounds is a promising pathway towards renewable chemicals. Structure-product selectivity studies highlight that copper (100) facets favour C2+ product formation. However, the atomic processes leading to the formation of (100)-rich Cu cubes remains elusive. Herein, we use Cu and graphene-protected Cu surfaces to reveal the differences in structure and composition of common Cu-based electrocatalysts, from nano to micrometer scales. We show that stripping/electrodeposition cycles lead to thermodynamically controlled growth of Cu2O micro/nanocubes, while multi-layered Cu nanocuboids form universally during CO2RR upon polarization-driven re-organization of Cu0 atoms. A synergy of electrochemical characterization by scanning tunnelling microscopy (EC-STM), operando EC-Raman and quasi-operando X-Ray Photoemission spectroscopy (XPS) allows us to shed light on the role of oxygen on the dynamic interfacial processes of Cu, and to demonstrate that chloride is not needed for the stabilization of cubic Cu nanostructures.

Understanding the role of axial O in CO2 electroreduction on NiN4 single-atom catalysts via simulations in realistic electrochemical environment

2021 ◽  
Author(s):  
Xu Hu ◽  
Sai Yao ◽  
Letian Chen ◽  
Xu Zhang ◽  
Menggai Jiao ◽  
...  
Keyword(s):  
Sustainable Development ◽  
Heterogeneous Catalysis ◽  
Co2 Reduction ◽  
Reduction Reaction ◽  
Single Atom ◽  
Electrochemical Co2 Reduction ◽  
Co2 Electroreduction ◽  
Important Approach ◽  
Co2 Reduction Reaction

Electrochemical CO2 reduction reaction (CO2RR) is a very important approach to realize sustainable development. Single-atom catalysts show advantages in both homogeneous and heterogeneous catalysis, and considerable progress has been made...

scholarly journals Optimizing the use of a “Zero-Gap” Gas Diffusion Electrode Setup for Electrochemical Reduction of CO2

2021 ◽  
Author(s):  
Shima Alinejad ◽  
Jonathan Quinson ◽  
Yao Li ◽  
Ying Kong ◽  
Sven Reichenberger ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Catalyst Layer ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Gas Diffusion Electrode ◽  
Test Bed ◽  
Catalyst Screening ◽  
Electrochemical Co2 Reduction ◽  
Reduction Of Co2 ◽  
Co2 Reduction Reaction

The lack of a robust and standardized experimental test bed to investigate the performance of catalyst materials for the electrochemical CO2 reduction reaction (ECO2RR) is one of the major challenges in this field of research. To best reproduce and mimic commercially relevant conditions for catalyst screening and testing, gas diffusion electrode (GDE) setups attract a rising attention as an alternative to conventional aqueous-based setups such as the H-cell configuration. In particular a zero-gap design shows promising features for upscaling to the commercial scale. In this study, we develop further our recently introduced zero-gap GDE setup for the CO2RR using an Au electrocatalyst as model system and identify/report the key experimental parameters to control in the catalyst layer preparation in order to optimize the activity and selectivity of the catalyst.

scholarly journals Solar-Driven Simultaneous Electrochemical CO2 Reduction and Water Oxidation Using Perovskite Solar Cells

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 270
Author(s):  
Jaehoon Chung ◽  
Nam Joong Jeon ◽  
Jun Hong Noh
Keyword(s):  
Solar Cells ◽  
Water Oxidation ◽  
Fuel Efficiency ◽  
Perovskite Solar Cells ◽  
Co2 Reduction ◽  
Electrode System ◽  
Efficient Reduction ◽  
Electrochemical Co2 Reduction ◽  
Products Analysis ◽  
Reduction Of Co2

The utilization of solar energy into electrochemical reduction systems has received considerable attention. Most of these attempts have been conducted in a single electrolyte without a membrane. Here, we report the system combined by the electrochemical CO2 reduction on the Au dendrite electrode and the water oxidation on the Co-Pi electrode with a Nafion membrane. An efficient reduction of CO2 to CO in the cathode using the proton from water oxidation in the anode is conducted using perovskite solar cells under 1 sun condition. The sustainable reaction condition is secured by balancing each reaction rate based on products analysis. Through this system, we collect reduction products such as CO and H2 and oxidation product, O2, separately. Employing separation of each electrode system and series-connected perovskite solar cells, we achieve 8% of solar to fuel efficiency with 85% of CO selectivity under 1 sun illumination.

Understanding the role of functional groups of thiolate ligands in electrochemical CO2 reduction over Au(111) from first-principles

2019 ◽  
Vol 7 (34) ◽  
pp. 19872-19880 ◽  
Author(s):  
Fuhua Li ◽  
Qing Tang
Keyword(s):  
Catalytic Activity ◽  
Functional Groups ◽  
First Principles ◽  
Co2 Reduction ◽  
Product Selectivity ◽  
Thiolate Ligands ◽  
Electrochemical Co2 Reduction

The functional groups of thiolates strongly affect the catalytic activity and product selectivity of CO2 electroreduction on Au(111).

scholarly journals In situ study of surface species and structure over Oxide-Derived Copper Catalysts for Electrochemical CO2 Reduction

2021 ◽  
Author(s):  
Chunjun Chen ◽  
Xupeng Yan ◽  
Yahui Wu ◽  
Shoujie Liu ◽  
Xiaofu Sun ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Copper Catalysts ◽  
Reaction Process ◽  
Real Structure ◽  
Surface Species ◽  
The Real ◽  
Effective Catalyst ◽  
In Situ Study ◽  
Electrochemical Co2 Reduction

The oxide-derived copper (OD-Cu) has been discovered as effective catalyst for electroreduction of CO2 to C2+ products. The real structure of the OD-Cu and surface species in the reaction process...

scholarly journals Metal–Ligand Exchange Coupling Promotes Iron-Catalyzed Electrochemical CO2 Reduction at Low Overpotentials

2020 ◽  
Author(s):  
Jeffrey Derrick ◽  
Matthias Loipersberger ◽  
Diana Iovan ◽  
Peter T. Smith ◽  
Khetpakorn Chakarawet ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Ligand Exchange ◽  
Exchange Coupling ◽  
Co2 Reduction ◽  
Open Shell ◽  
Electronic Delocalization ◽  
Electrochemical Co2 Reduction ◽  
Reduction Of Co2 ◽  
High Degree ◽  
Metal Ligand

Biological and heterogenous catalysts for electrochemical CO2 reduction often exhibit a high degree of electronic delocalization that serves to minimize overpotential and maximize selectivity over hydrogen evolution. Here, we report a molecular iron(II) complex that achieves a similar feat as a result of strong metal–ligand exchange coupling. This interaction promotes an open-shell singlet electronic structure that drives the electrochemical reduction of CO2 to CO with over 90% selectivity and turnover frequencies of 100,000 s−1 at low overpotentials, with no degradation over 20 hours. The decrease in the thermodynamic barrier engendered by this strong metal–ligand exchange coupling enables homogeneous CO2 reduction catalysis in water without compromising reaction selectivity.

Electropolymerized Metal-Protoporphyrin electrodes for Selective Electrochemical Reduction of CO2

2021 ◽  
Author(s):  
Nael Yasri ◽  
Tareq Al-Attas ◽  
Jinguang Hu ◽  
Md Golam Kibria
Keyword(s):  
Electrochemical Reduction ◽  
Aqueous Media ◽  
Co2 Reduction ◽  
Reduction Reaction ◽  
Practical Implementation ◽  
Electrochemical Co2 Reduction ◽  
Reduction Of Co2 ◽  
Co2 Reduction Reaction

Developing catalysts that exhibit high efficiencies for the electrochemical CO2 reduction reaction (CO2RR) in aqueous media is vital in both aspects of the healthier environment and for the practical implementation...

scholarly journals Photo-Reduction of CO2 by VIS Light on Polythiophene-ZSM-5 Zeolite Hybrid Photo-Catalyst

Molecules ◽  
2019 ◽  
Vol 24 (5) ◽  
pp. 992 ◽  
Author(s):  
Jana Kianička ◽  
Gabriel Čík ◽  
František Šeršeň ◽  
Ivan Špánik ◽  
Robert Sokolík ◽  
...  
Keyword(s):  
Aqueous Suspension ◽  
Oxidative Polymerization ◽  
Co2 Reduction ◽  
Product Formation ◽  
Photo Catalyst ◽  
Radical Intermediates ◽  
Reactive Radicals ◽  
Reduction Of Co2 ◽  
Epr Spin Trapping ◽  
Spin Trapping Technique

A new hybrid photo-catalyst based on ZSM-5 zeolite suitable for reduction of carbon dioxide was synthesized. The photo-catalyst was prepared by oxidative polymerization of thiophene with FeCl3 in the presence of ZSM-5 with participation of ultrasound. The synthesized photo-catalyst strongly absorbs light radiation up to approx. 650 nm, with the absorption edge in the NIR region. Reactive radicals were generated by VIS light irradiation in an aqueous suspension consisting of the photo-catalyst with CO2. Formic acid and acetic acid were generated as the main products of the CO2 reduction. EPR spin trapping technique was applied to identify the reactive radical intermediates. In this work, the mechanism of product formation is also discussed.

Sign in / Sign up

Export Citation Format

Share Document