scholarly journals Effect of the Nanostructured Zn/Cu Electrocatalyst Morphology on the Electrochemical Reduction of CO2 to Value-Added Chemicals

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1671
Author(s):  
Piriya Pinthong ◽  
Phongsathon Klongklaew ◽  
Piyasan Praserthdam ◽  
Joongjai Panpranot

Zn/Cu electrocatalysts were synthesized by the electrodeposition method with various bath compositions and deposition times. X-ray diffraction results confirmed the presence of (101) and (002) lattice structures for all the deposited Zn nanoparticles. However, a bulky (hexagonal) structure with particle size in the range of 1–10 μm was obtained from a high-Zn-concentration bath, whereas a fern-like dendritic structure was produced using a low Zn concentration. A larger particle size of Zn dendrites could also be obtained when Cu2+ ions were added to the high-Zn-concentration bath. The catalysts were tested in the electrochemical reduction of CO2 (CO2RR) using an H-cell type reactor under ambient conditions. Despite the different sizes/shapes, the CO2RR products obtained on the nanostructured Zn catalysts depended largely on their morphologies. All the dendritic structures led to high CO production rates, while the bulky Zn structure produced formate as the major product, with limited amounts of gaseous CO and H2. The highest CO/H2 production rate ratio of 4.7 and a stable CO production rate of 3.55 μmol/min were obtained over the dendritic structure of the Zn/Cu–Na200 catalyst at −1.6 V vs. Ag/AgCl during 4 h CO2RR. The dissolution and re-deposition of Zn nanoparticles occurred but did not affect the activity and selectivity in the CO2RR of the electrodeposited Zn catalysts. The present results show the possibilities to enhance the activity and to control the selectivity of CO2RR products on nanostructured Zn catalysts.

2019 ◽  
Vol 7 (34) ◽  
pp. 19977-19983 ◽  
Author(s):  
Wei Xiong ◽  
Zheng Guo ◽  
Shijun Zhao ◽  
Qian Wang ◽  
Qiyong Xu ◽  
...  

A non-precious, self-supportive FeSx NRR electrocatalyst was synthesized by a simple H2S-plasma treatment on low-cost Fe foam, which shows a remarkable NH3 production rate of 4.13 × 10−10 mol s−1 cm−2 and a high faradaic efficiency of 17.6%.


Nanoscale ◽  
2021 ◽  
Author(s):  
Shuo Liu ◽  
Yu Cao ◽  
Hai Liu ◽  
HuiLi Wang ◽  
Baoshan Zhang ◽  
...  

Coupled with renewable electricity, electrochemical reduction of CO2 (CO2RR) is one of the sustainable strategies for the production of value-added carbon-containing chemicals. Cu-based catalysts are by far the most widely...


2021 ◽  
Vol 6 (4) ◽  
pp. 612-628
Author(s):  
Xianbiao Fu ◽  
Jiahao Zhang ◽  
Yijin Kang

The two-step electroreduction of CO2 to multi-carbon products with a high selectivity and production rate of industrial relevance provides an alternative route for converting CO2 to fuels and chemicals.


Electrochem ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 56-59
Author(s):  
Ana Cristina Perez ◽  
Manuel Antonio Diaz-Perez ◽  
Juan Carlos Serrano-Ruiz

Electroreduction allows for the transformation of a chemically inert molecule such as CO2 into a wide variety of useful carbon products. Unlike other approaches operating at higher temperatures, electrochemical reduction holds great promise since it achieves reduction under ambient conditions, thereby providing more control over the reaction selectivity. By controlling basic parameters such as the potential and the composition of the electrode, CO2 can be transformed into a variety of products including carbon monoxide, syngas (CO/H2), methane, and methanol. This reduction process takes place without external hydrogen, since water can be used as a source of both electrons and protons. Furthermore, this technology, when combined with renewable wind- or solar-derived electricity, has the potential to serve as a storage system for excess electricity. Despite these advantages, a number of challenges need to be overcome before reaching commercialization. New (and cheaper) electrocatalyst formulations with high faradaic selectivities are required. Impressive progress has been made on carbon-doped materials, which, in certain cases, have outperformed expensive noble metal-based materials. Research is also needed on new electrochemical reactor configurations able to overcome kinetic/mass transport limitations, which are crucial to reduce overpotentials. Fine control over the nature of the active sites and the reaction conditions is important to avoid parasitic reactions such as the hydrogen evolution reaction (HER), and therefore increases the faradaic efficiency towards the desired products.


Author(s):  
Eman A. Mohamed ◽  
Zaki Zahran ◽  
Yoshinori Naruta

Efficient and selective electrochemical reduction of CO2 is a promising approach for its conversion to high value-added chemicals and reducing its green-house effect. Unless a suitable catalyst, the reduction occurs...


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