Synthesis and testing of cobalt leaf-like nanomaterials as an active catalyst for ethanol oxidation

Abdelkareem, Mohammad Ali; Sayed, Enas Taha; Alawadhi, Hussain; Alami, Abdul Hai

doi:10.1016/j.ijhydene.2020.04.156

Cited by 41 publications

(9 citation statements)

References 45 publications

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“…Copper or cobalt are also among the materials used for the electrochemical oxidation of ethanol, [29–32] ethylene glycol, [33,34] and glycerol [34–37] . Moreover, the combination of both Cu and Co in bimetallic systems has been shown to be electrocatalytically advantageous for the electrochemical glycerol oxidation reaction (GOR) [38–40] .…”

Section: Introductionmentioning

confidence: 99%

Electrooxidation of Alcohols on Mixed Copper–Cobalt Hydroxycarbonates in Alkaline Solution

et al. 2022

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Mixed Cu‐Co hydroxycarbonates of the type (Cu1–xCox)2CO3(OH)2 have been synthesized over the whole range of Cu‐Co substitution (0≤x≤1) by co‐precipitation and their electrocatalytic activity in the oxidation reactions of ethanol (EOR), ethylene glycol (EGOR) and glycerol (GOR) in alkaline environment was evaluated to retrieve composition–activity correlations. Generally, cobalt incorporation led to higher activities for the alcohol oxidation (AOR) compared to the Cu‐only material and the results are compared with the competing oxygen evolution reaction (OER). On the Cu‐Co hydroxycarbonates, the electrooxidation of vicinal alcohols such as glycerol and ethylene glycol requires lower overpotentials than EOR and OER. Cu leaching from the hydroxycarbonate structure was observed in the presence of vicinal alcohols. The impact of chemical and electrochemical leaching of copper from the catalysts has been studied. The chemically leached catalyst was found to show increased AOR activity compared to other hydroxycarbonates, enabling the formation of larger amounts of formic acid during GOR measured in a circular flow cell electrolyzer. The results highlight that Cu‐Co hydroxycarbonates can be used as precursors to generate electrocatalytically active materials from Cu‐Co hydroxycarbonates for the AOR in alkaline solution.

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Section: Introductionmentioning

confidence: 99%

Electrooxidation of Alcohols on Mixed Copper–Cobalt Hydroxycarbonates in Alkaline Solution

et al. 2022

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“…Eisa et al 262 have also conducted Ni/NiO nanorods coated NF in alkaline ethanol oxidation reaction and achieved a greater current density of 542.9 mAcm −2 rather than in alkaline MOR (392.2 mAcm −2 ). Just recently, in a later study, Abdelkareem et al 263 have synthesized a 3D‐leaf like Co nanoparticles using a facile electrodeposition technique as displayed in Figure 13. Their finding found that the surface area of Co‐leaf like structure composed of nanosheets of few nanometers in thickness is three times higher than the Co nanoparticles.…”

Section: Non‐precious Catalyst In Direct Liquid Fuel Cellsmentioning

confidence: 99%

“…SEM images of Co of leaf structure at (A) low magnification and (B) high magnification, (C) SEM image of NiCo 2 O 4 fiber, (D) TEM image of NiCo 2 O 4 fiber, and (E) SEM image of NNR/NF catalyst 263 …”

Section: Non‐precious Catalyst In Direct Liquid Fuel Cellsmentioning

confidence: 99%

Progress and challenges: Review for direct liquid fuel cell

et al. 2021

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Summary Direct liquid fuel cell (DLFC) is one of the leading fuel cell types due to their great features of superior energy density, modest configuration, small size in fuel container, immediate boosting, and effortless storage and carriage. Commercially used liquid fuel types are prepared using alcohols, such as methanol or ethanol, glycol, and acids. DLFCs face great challenges although they are potentially far‐reaching depending on the expensive catalysts and the use of high‐loading catalyst. More questions that should be addressed to ensure excellent DLFC performance include cathode flooding, fuel crossover, numerous side yield production, fuel security, and unverified elongated‐duration robustness. Further studies need to be carried out to ensure the continuous improvement of the quality of DLFCs' performance and their penetration in the commercial market. To date, direct liquid fuel cells made of methanol and ethanol have been successfully produced in commercial scale, but other types of DLFCs are still under study. In this review, introduction to DLFC will be discussed by covering work and commercialization as well as recent progress and challenges encountered.

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“…The environmental impact of fossil fuels can be minimized through increasing the efficiency of current technologies [4,5] and/or relying on renewable energy sources [6], such as biomass energy [7][8][9], wind energy [10,11], solar thermal energy [12,13], solar PV [14][15][16], ocean energy [17], and geothermal energy [9]. Fuel cells are emerging energy conversion devices that are silent, have a high theoretical efficiency [18][19][20], and exhibited high performance when installed in several applications [21,22]. Microbial fuel cells (MFCs) are one of the most promising types of fuel cells, used for simultaneous wastewater treatment and energy harvesting [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

A Carbon-Cloth Anode Electroplated with Iron Nanostructure for Microbial Fuel Cell Operated with Real Wastewater

et al. 2020

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Microbial fuel cell (MFC) is an emerging method for extracting energy from wastewater. The power generated from such systems is low due to the sluggish electron transfer from the inside of the biocatalyst to the anode surface. One strategy for enhancing the electron transfer rate is anode modification. In this study, iron nanostructure was synthesized on a carbon cloth (CC) via a simple electroplating technique, and later investigated as a bio-anode in an MFC operated with real wastewater. The performance of an MFC with a nano-layer of iron was compared to that using bare CC. The results demonstrated that the open-circuit voltage increased from 600 mV in the case of bare CC to 800 mV in the case of the iron modified CC, showing a 33% increase in OCV. This increase in OCV can be credited to the decrease in the anode potential from 0.16 V vs. Ag/AgCl in the case of bare CC, to −0.01 V vs. Ag/AgCl in the case of the modified CC. The power output in the case of the modified electrode was 80 mW/m2—two times that of the MFC using the bare CC. Furthermore, the steady-state current in the case of the iron modified carbon cloth was two times that of the bare CC electrode. The improved performance was correlated to the enhanced electron transfer between the microorganisms and the iron-plated surface, along with the increase of the anode surface- as confirmed from the electrochemical impedance spectroscopy and the surface morphology, respectively.

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Synthesis and testing of cobalt leaf-like nanomaterials as an active catalyst for ethanol oxidation

Cited by 41 publications

References 45 publications

Electrooxidation of Alcohols on Mixed Copper–Cobalt Hydroxycarbonates in Alkaline Solution

Electrooxidation of Alcohols on Mixed Copper–Cobalt Hydroxycarbonates in Alkaline Solution

Progress and challenges: Review for direct liquid fuel cell

A Carbon-Cloth Anode Electroplated with Iron Nanostructure for Microbial Fuel Cell Operated with Real Wastewater

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