Role of small Cu nanoparticles in the behaviour of nanocarbon-based electrodes for the electrocatalytic reduction of CO2

Marepally, Bhanu Chandra; Ampelli, Claudio; Genovese, Chiara; Tavella, Francesco; Veyre, Laurent; Quadrelli, Elsje Alessandra; Perathoner, Siglinda; Centi, Gabriele

doi:10.1016/j.jcou.2017.08.008

Cited by 56 publications

(45 citation statements)

References 29 publications

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“…Mathematically, the ECSA can be described as Equation

ECSA = R_{normalf} \times A_{normals}

where A s is a specific surface area of the smooth surface electrode; R f is roughness factor estimated from the ratio of double‐layer capacitance ( C dl ) for the working electrode. C dl is determined by evaluating the capacitive current related with double‐layer charging at various scanning rates of cyclic voltammetry in electrochemical analysis …”

Section: Intrinsic Factors Of Co2er On Cu‐based Electrocatalystsmentioning

confidence: 99%

Copper and Copper‐Based Bimetallic Catalysts for Carbon Dioxide Electroreduction

Birhanu

Tsai

Kahsay

et al. 2018

Adv Materials Inter

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Among many alternatives, CO2 electroreduction (CO2ER) is an emerging technology to alleviate its level in the atmosphere and simultaneously to produce essential products containing high energy density using various electrocatalysts. Cu‐based mono‐ and bimetallics are electrocatalysts of concerns in this work due to the material's abundance and versatility. Intrinsic factors affecting the CO2ER are first analyzed, whereby understanding and characterizing the surface features of electrocatalysts are addressed. An X‐ray absorption spectroscopy‐based methodology is discussed to determine electronic and structural properties of electrocatalyst surface which allows the prediction of reaction mechanism and establishing the correlation with reduction products. The selectivity and faradaic efficiency of products highly depend on the quality of surface modification. Preparation and modification of electrocatalyst surfaces through various techniques are critical to increase the number of activity sites and the corresponding site activity. Mechanisms of CO2ER are complicate and thus are discussed in accordance with main products of interests. The authors try to concisely compile the most interesting, recent, and reasonable ideas that are agreeable to experimental results. Finally, this review provides an outlook for designing better Cu and Cu‐based bimetallic catalysts to obtain selective products through CO2ER.

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“…Mathematically, the ECSA can be described as Equation

ECSA = R_{normalf} \times A_{normals}

Section: Intrinsic Factors Of Co2er On Cu‐based Electrocatalystsmentioning

confidence: 99%

Copper and Copper‐Based Bimetallic Catalysts for Carbon Dioxide Electroreduction

Birhanu

Tsai

Kahsay

et al. 2018

Adv Materials Inter

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“…These findings may be attributed to the fact that the increasing amount of active sites can produce more hydroxyl groups. 47,48 As the loads of Cu increased, the size of the nanoparticles continued to increase (Fig. S1).…”

Section: Resultsmentioning

confidence: 97%

Biosynthesis of Cu nanoparticles supported on carbon nanotubes and its catalytic performance under different test conditions

Huang

Shi

2020

J of Chemical Tech & Biotech

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BACKGROUND 4‐Nitrophenol (4‐NP) is used widely in pesticides and other areas, but it can cause adverse environmental effects. Thus, it is desirable to convert it to 4‐aminophenol (4‐AP). Microbial synthesis of nanomaterials has the characteristics of low cost and effective control of secondary pollution. The catalytic performance of biosynthesized nanocomposites of copper (Cu) and carbon nanotubes (CNTs) in reducing 4‐NP to 4‐AP was evaluated. RESULTS Here, Cu nanoparticles were supported in situ on CNT nanocomposites via Shewanella oneidensis MR‐1 to form Cu/CNT nanocomposites. The prepared Cu/CNTs nanocomposites were characterized by transmission electron microscopy, X‐ray photoelectron spectroscopy, Raman spectrometry, and energy dispersed X‐ray spectroscopy. The findings showed that the Cu nanoparticles were successfully synthesized on the surface of the CNTs and that they had a typical diameter of 4 to 10 nm and high crystallinity. The catalytic performance of the nanocomposites for the reduction of 4‐NP was evaluated under different initial concentrations of Cu/CNT, pH, and temperatures. The best catalytic performance, in which 99.5% 4‐NP was reduced, was obtained with 3 wt% Cu/CNT at 45 °C and pH of 10 within 80 min. Accordingly, 4‐NP degradation followed first‐order kinetics, and the rate constant (k) has been calculated to be 0.0532 min−1. The Cu/CNT nanocomposite exhibited high stability catalytic efficiency at 95.2% even after six reaction cycles. CONCLUSION The study demonstrates an environmentally friendly method for synthesizing non‐noble metal nanocomposites and using them for the catalytic reduction of 4‐NP. The method could be applied to prepare other efficient and reusable metallic nanocatalysts. © 2020 Society of Chemical Industry

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“…The decreasing FE to methanol with increasing potential and current density at higher overpotentials can be allocated to the HER as the dominating reaction. [48] After Ru-based CCM [53] Gas phase 0.46 0.90 0.93 CuÀ TiO 2 /NG based GDE [54] Near neutral (pH = 6.8) À 0.20 À 0.06 19.5 Cu-doped CNTs based GDE [55] Alkaline (pH = 9) 0.28 À 4.75 47.4 CuÀ Bi MOFs based GDE [15] Near neutral (pH = 6.8) blend solution causing densification of the membrane overlayer upon casting and solvent evaporation, as well as the largest water transport reported elsewhere. These results are attributed to the higher accessibility of CO 2 to the catalyst in the uncoated GDE, and confirmed that the membrane over-layer was posing an additional resistance to transport.…”

Section: Electrochemical Reduction Of Comentioning

confidence: 99%

“…Ru-based CCM [53] Gas phase 0.46 0.90 0.93 CuÀ TiO 2 /NG based GDE [54] Near neutral (pH = 6.8) À 0.20 À 0.06 19.5 Cu-doped CNTs based GDE [55] Alkaline (pH = 9) 0.28 À 4.75 47.4 CuÀ Bi MOFs based GDE [15] Near neutral (pH = blend solution causing densification of the membrane overlayer upon casting and solvent evaporation, as well as the largest water transport reported elsewhere. [48] Therefore, this Cu/CS : PVA membrane layer generated the highest current densities generated of all MCE in Table 2, but the catalyst in metallic form seemed to be less accessible for CO 2 and its ionic forms, so the methanol production dropped, in favor of HER as dominant reaction.…”

Section: Electrodementioning

confidence: 99%

Sustainable Membrane‐Coated Electrodes for CO₂ Electroreduction to Methanol in Alkaline Media

2019

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CO 2 electroreduction has high potential to combine carbon capture utilization and energy storage from renewable sources. The key challenge is the construction of highly efficient electrodes giving optimal CO 2 conversion to high-value products. In this regard, research on electrode structures remains as an important task to face. Despite the advancements in gas diffusion electrodes (GDEs) to facilitate CO 2 transfer and electrode efficiency, the catalyst is still vulnerable to be swept by the gas and liquid electrolyte, reducing the stability. We report the fabrication of novel membrane-coated electrodes (MCEs), by coating an anion exchange membrane over a copper (Cu) : chitosan (CS) catalyst layer onto the carbon paper. CS and poly(vinyl) alcohol (PVA) were chosen for membrane preparation and catalyst binder, where Cu was embedded in the polymer matrix as nanoparticles or ion-exchanged in a layered stannosilicate or zeolite Y, to improve their hydrophilic, conductive, mechanical, and environmentally-friendly properties considered relevant to the sustainability of the electrode fabrication and performance. The intimate connection between the CS : PVA polymer membrane over-layer and the CS/Cu catalytic layer protects the MCEs from material losses, enhancing the CO 2 conversion to methanol, even in high alkaline medium. A maximum Faraday Efficiency to methanol of 68.05 % was achieved for the 10CuY/CS : PVA membrane over-layer.

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Role of small Cu nanoparticles in the behaviour of nanocarbon-based electrodes for the electrocatalytic reduction of CO2

Cited by 56 publications

References 29 publications

Copper and Copper‐Based Bimetallic Catalysts for Carbon Dioxide Electroreduction

Copper and Copper‐Based Bimetallic Catalysts for Carbon Dioxide Electroreduction

Biosynthesis of Cu nanoparticles supported on carbon nanotubes and its catalytic performance under different test conditions

Sustainable Membrane‐Coated Electrodes for CO₂ Electroreduction to Methanol in Alkaline Media

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Role of small Cu nanoparticles in the behaviour of nanocarbon-based electrodes for the electrocatalytic reduction of CO2

Cited by 56 publications

References 29 publications

Copper and Copper‐Based Bimetallic Catalysts for Carbon Dioxide Electroreduction

Copper and Copper‐Based Bimetallic Catalysts for Carbon Dioxide Electroreduction

Biosynthesis of Cu nanoparticles supported on carbon nanotubes and its catalytic performance under different test conditions

Sustainable Membrane‐Coated Electrodes for CO2 Electroreduction to Methanol in Alkaline Media

Contact Info

Product

Resources

About

Sustainable Membrane‐Coated Electrodes for CO₂ Electroreduction to Methanol in Alkaline Media