Mechanistic insight into photocatalytic CO2 reduction by Z-scheme g-C3N4/TiO2 heterostructure

2021 ◽  
Author(s):  
Shuo Wang ◽  
Ting-Ting Zhao ◽  
Yu Tian ◽  
Li-Kai Yan ◽  
Zhong-Min Su
Keyword(s):  
Solar Energy ◽  
Co2 Reduction ◽  
Value Added ◽  
Reduction Reaction ◽  
Mechanistic Insight ◽  
High Efficient ◽  
Co2 Reduction Reaction ◽  
Insight Into

Developing high-efficient and selectivity catalysts for CO2 reduction reaction (CO2RR) is significant to convert solar energy to value-added chemicals, Z-scheme heterostructures are promising materials for photocatalytic CO2 reduction due to...

Hierarchical three-dimensional copper selenide nanocubes microelectrodes for improved carbon dioxide reduction reaction

2021 ◽  
Author(s):  
Rajasekaran Elakkiya ◽  
Govindhan Maduraiveeran
Keyword(s):  
Carbon Dioxide ◽  
High Performance ◽  
Three Dimensional ◽  
Co2 Reduction ◽  
Value Added ◽  
Carbon Dioxide Reduction ◽  
Reduction Reaction ◽  
Earth Abundant ◽  
Carbon Dioxide Co2 ◽  
Co2 Reduction Reaction

Design of high-performance and Earth-abundant electrocatalysts for electrochemical carbon dioxide (CO2) reduction reaction (CO2RR) into fuels and value-added chemicals offers an emergent pathway for environment and energy sustainable concerns. Herein,...

Engineering conductive network of atomically thin bismuthene with rich defects enables CO2 reduction to formate with industry-compatible current densities and stability

2021 ◽  
Author(s):  
Min Zhang ◽  
Wenbo Wei ◽  
Shenghua Zhou ◽  
Dong-Dong Ma ◽  
Aihui Cao ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Value Added ◽  
Reduction Reaction ◽  
Conductive Network ◽  
Electrochemical Co2 Reduction ◽  
Liquid Products ◽  
Current Densities ◽  
Co2 Reduction Reaction

Electrochemical CO2 reduction reaction (CO2RR) to value-added and readily collectable liquid products is promising but remains a great challenge due to the lack of efficient and robust electrocatalysts. Herein, a...

scholarly journals Copper-Tin Alloys for the Electrocatalytic Reduction of CO2 in an Imidazolium-Based Non-Aqueous Electrolyte

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3132 ◽  
Author(s):  
Robert Sacci ◽  
Stephanie Velardo ◽  
Lu Xiong ◽  
Daniel Lutterman ◽  
Joel Rosenthal
Keyword(s):  
Co2 Reduction ◽  
Value Added ◽  
Catalyst System ◽  
Reduction Reaction ◽  
Technological Advancement ◽  
Imidazolium Cation ◽  
Tin Alloys ◽  
Standard Calomel Electrode ◽  
Reduction Of Co2 ◽  
Co2 Reduction Reaction

The ability to synthesize value-added chemicals directly from CO2 will be an important technological advancement for future generations. Using solar energy to drive thermodynamically uphill electrochemical reactions allows for near carbon-neutral processes that can convert CO2 into energy-rich carbon-based fuels. Here, we report on the use of inexpensive CuSn alloys to convert CO2 into CO in an acetonitrile/imidazolium-based electrolyte. Synergistic interactions between the CuSn catalyst and the imidazolium cation enables the electrocatalytic conversion of CO2 into CO at −1.65 V versus the standard calomel electrode (SCE). This catalyst system is characterized by overpotentials for CO2 reduction that are similar to more expensive Au- and Ag-based catalysts, and also shows that the efficacy of the CO2 reduction reaction can be tuned by varying the CuSn ratio.

scholarly journals CO2 and H2O Coadsorption and Reaction on the Low-Index Surfaces of Tantalum Nitride: A First-Principles DFT-D3 Investigation

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1217 ◽  
Author(s):  
Nelson Y. Dzade
Keyword(s):  
First Principles ◽  
Vibrational Frequency ◽  
Co2 Reduction ◽  
Value Added ◽  
Tantalum Nitride ◽  
Mechanistic Insight ◽  
Narrow Bandgap ◽  
The Stability ◽  
Reduction Of Co2 ◽  
Insight Into

A comprehensive mechanistic insight into the photocatalytic reduction of CO2 by H2O is indispensable for the development of highly efficient and robust photocatalysts for artificial photosynthesis. This work presents first-principles mechanistic insights into the adsorption and activation of CO2 in the absence and presence of H2O on the (001), (010), and (110) surfaces of tantalum nitride (Ta3N5), a photocatalysts of significant technological interest. The stability of the different Ta3N surfaces is shown to dictate the strength of adsorption and the extent of activation of CO2 and H2O species, which bind strongest to the least stable Ta3N5(001) surface and weakest to the most stable Ta3N5(110) surface. The adsorption of the CO2 on the Ta3N5(001), (010), and (110) surfaces is demonstrated to be characterized by charge transfer from surface species to the CO2 molecule, resulting in its activation (i.e., forming negatively charged bent CO2−δ species, with elongated C–O bonds confirmed via vibrational frequency analyses). Compared to direct CO2 dissociation, H2O dissociates spontaneously on the Ta3N5 surfaces, providing the necessary hydrogen source for CO2 reduction reactions. The coadsorption reactions of CO2 and H2O are demonstrated to exhibit the strongest attractive interactions on the (010) surface, giving rise to proton transfer to the CO2 molecule, which causes its spontaneous dissociation to form CO and 2OH− species. These results demonstrate that Ta3N5, a narrow bandgap photocatalyst able to absorb visible light, can efficiently activate the CO2 molecule and photocatalytically reduce it with water to produce value-added fuels.

scholarly journals Materials and system design for direct electrochemical CO2 conversion in capture media

2021 ◽  
Author(s):  
Shuzhen Zhang ◽  
Celia Chen ◽  
Kangkang Li ◽  
Hai Yu ◽  
Fengwang Li
Keyword(s):  
System Design ◽  
Co2 Reduction ◽  
Value Added ◽  
Reduction Reaction ◽  
Co2 Conversion ◽  
Renewable Electricity ◽  
Electrochemical Co2 Reduction ◽  
Co2 Reduction Reaction

Electrochemical CO2 reduction reaction (eCO2RR) has been regarded as a promising means to store renewable electricity in the form of value-added chemicals or fuels. However, most of present eCO2RR studies...

scholarly journals Bioelectrosynthetic Conversion of CO2 Using Different Redox Mediators: Electron and Carbon Balances in a Bioelectrochemical System

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2572 ◽  
Author(s):  
Shuwei Li ◽  
Young Eun Song ◽  
Jiyun Baek ◽  
Hyeon Sung Im ◽  
Mutyala Sakuntala ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Reducing Power ◽  
Value Added ◽  
Neutral Red ◽  
Reduction Reaction ◽  
Redox Mediators ◽  
Acetate Production ◽  
Electrochemically Active ◽  
Carbon Balances ◽  
Co2 Reduction Reaction

Microbial electrosynthesis (MES) systems can convert CO2 to acetate and other value-added chemicals using electricity as the reducing power. Several electrochemically active redox mediators can enhance interfacial electron transport between bacteria and the electrode in MES systems. In this study, different redox mediators, such as neutral red (NR), 2-hydroxy-1,4-naphthoquinone (HNQ), and hydroquinone (HQ), were compared to facilitate an MES-based CO2 reduction reaction on the cathode. The mediators, NR and HNQ, improved acetate production from CO2 (165 mM and 161 mM, respectively) compared to the control (without a mediator = 149 mM), whereas HQ showed lower acetate production (115 mM). On the other hand, when mediators were used, the electron and carbon recovery efficiency decreased because of the presence of bioelectrochemical reduction pathways other than acetate production. Cyclic voltammetry of an MES with such mediators revealed CO2 reduction to acetate on the cathode surface. These results suggest that the addition of mediators to MES can improve CO2 conversion to acetate with further optimization in an operating strategy of electrosynthesis processes.

scholarly journals Generation of Fuel and Value-Added Chemicals from Carbon Dioxide (CO2)

2020 ◽  
Vol 12 (01) ◽  
pp. 41-44
Author(s):  
Pooja Srivastava
Keyword(s):  
Carbon Dioxide ◽  
Transition Metal ◽  
Co2 Reduction ◽  
Value Added ◽  
Reduction Reaction ◽  
Long Term Effects ◽  
Industrial Chemicals ◽  
Continuous Increase ◽  
Carbon Dioxide Co2 ◽  
Co2 Reduction Reaction

Despite its life-threatening long term effects, the continuous increase of carbon dioxide (CO2) in the environment requires immediate actions to control the accelerating climate change. An appealing solution to this problem is to utilize CO2 as feedstock to generate useful chemicals, e.g., fuel, hydrocarbons, and valuable chemicals. The chemical inertness of CO2 needs considerably large energy for its conversion into useful chemicals. Therefore, CO2 reduction reaction requires an effective catalyst for its conversion into fuel (methanol, methane) and industrial chemicals (syngas, formic acid). Recently, two-dimensional layers of early transition metal carbides and nitrides, called MXene, have shown potential for catalysis due to its exposed transition metal sites, and mechanical and chemical stability at high temperatures. Herein, the author presents the MXene as a potential heterogeneous catalyst for the CO2 reduction reaction (CRR), and the future scope in this currently developing field.

Support-based modulation strategies in single-atom catalysts for electrochemical CO2 reduction: graphene and conjugated macrocyclic complexes

2021 ◽  
Author(s):  
Zhanzhao Fu ◽  
Mingliang Wu ◽  
Yipeng Zhou ◽  
Zhiyang Lyu ◽  
Yixin Ouyang ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Value Added ◽  
Co2 Concentration ◽  
Reduction Reaction ◽  
Macrocyclic Complexes ◽  
Promising Method ◽  
Single Atom ◽  
Electrochemical Co2 Reduction ◽  
Co2 Reduction Reaction

Electrochemical CO2 reduction reaction (CO2RR) is a promising method to decrease the CO2 concentration in the atmosphere and produce high value-added chemicals simultaneously. Catalysts play a central role in the...

scholarly journals Investigation of Zn/Ni-Based Electrocatalysts for Electrochemical Conversion of CO2 to SYNGAS

2021 ◽  
Author(s):  
Mohammadali Beheshti ◽  
Saeid Kakooei ◽  
Mokhtar Che Ismail ◽  
Shohreh Shahrestani
Keyword(s):  
Large Scale ◽  
Steel Substrate ◽  
Renewable Energy Sources ◽  
Coke Formation ◽  
Co2 Reduction ◽  
Value Added ◽  
Reduction Reaction ◽  
Electrochemical Tests ◽  
Reduction Of Co2 ◽  
Co2 Reduction Reaction

In the last decade, there is some research on the conversion of CO2 to energy form. CO2 can be converted to value-added chemicals including HCOOH, CO, CH4, C2H4, and liquid hydrocarbons that can be used in various industries. Among the methods, electrochemical methods are of concern regarding their capability to operate with an acceptable reaction rate and great efficiency at room temperature and can be easily coupled with renewable energy sources. Besides, electrochemical cell devices have been manufactured in a variety of sizes, from portable to large-scale applications. Catalysts that optionally reduce CO2 at low potential are required. Therefore, choosing a suitable electrocatalyst is very important. This chapter focused on the electrochemical reduction of CO2 by Zn-Ni bimetallic electrocatalyst. The Zn-Ni coatings were deposited on the low-carbon steel substrate. Electrochemical deposition parameters such as temperature in terms of LPR corrosion rate, microstructure, microcracks, and its composition have been investigated. Then, the electrocatalyst stability and activity, as well as gas intensity and selectivity, were inspected by SEM/EDX analysis, GC, and electrochemical tests. Among the electrocatalysts for CO2 reduction reaction, the Zn65%-Ni35% electrode with cluster-like microstructure had the best performance for CO2 reduction reaction according to minimum coke formation (<10%) and optimum CO and H2 faradaic efficiencies (CO FE% = 55% and H2 FE% = 45%).

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