Electrooxidation behavior of ethanol toward carbon microbead-encapsulated ZnO particles derived from coffee waste

Ghouri, Zafar Khan; Elsaid, Khaled; Abdel‐Wahab, Ahmed; Abdala, Ahmed; Farhad, Mohammad

doi:10.1007/s10854-020-03209-w

Cited by 14 publications

(5 citation statements)

References 42 publications

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“…This suggests that incorporating CuO nanoparticles is responsible for the increase in EOR. The current value is similar to that reported on Ni 2 MnO 8 (close to 10 mA cm −2 at 1.6 V) [52] but above the values recently reported on CM-ZnO, 6.0 mA cm −2 close to 1.6 V vs. RHE (1.0 mol L −1 EtOH + 1mol L −1 KOH) [53].…”

Section: Electrochemical Characterizationsupporting

confidence: 89%

“…This suggests that incorporatin CuO nanoparticles is responsible for the increase in EOR. The current value is similar t that reported on Ni2MnO8 (close to 10 mA cm −2 at 1.6 V) [52] but above the values recentl reported on CM-ZnO, 6.0 mA cm −2 close to 1.6 V vs. RHE (1.0 mol L −1 EtOH + 1mol L KOH) [53]. It should be highlighted that no significant decrease in current density was observe under the test conditions when the ethanol concentration was increased.…”

Section: Electrochemical Characterizationsupporting

confidence: 88%

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Facile Preparation of SnO2/CuO Nanocomposites as Electrocatalysts for Energy-Efficient Hybrid Water Electrolysis in the Presence of Ethanol

Pech-Rodríguez,

García-Lezama,

Sahin

2023

Energies

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Currently, great importance has been assigned to designing cutting-edge materials for oxygen and hydrogen generation from hybrid water electrolysis as an ideal fuel alternative in energy-conversion devices. This work reports on the electrochemical organic molecule oxidation in alkaline media, intending to promote water electrolysis at early onset potential with more current densities using Sn-Cu oxidized heterostructures. The electrocatalysts were easily and rapidly synthesized by the microwave-heated synthesis process in the presence of a small quantity of ethylene glycol. The X-ray diffraction and Field Emission Scanning Electron Microscopy analyses confirm the presence of CuO and SnO2 phases, which significantly improves the electrochemical activity of the composite toward the Oxygen Evolution Reaction (OER) in alkaline media in the presence of 1.0 mol L−1 ethanol, yielding 8.0 mA cm−2 at 1.6 V. The charge transfer resistance (Rct) was determined using electrochemical impedance spectroscopy, and the result shows that the Rct of SnO2/CuO drastically decreased. The findings in this work highlight that the designed oxidized heterostructures with non-noble metals are promising candidates for energy conversion devices and sensors. Furthermore, this work confirms the advantages of using an assisted microwave heating process to develop an advanced SnO2/CuO composite with the potential to be used in electro-oxidation processes.

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Section: Electrochemical Characterizationsupporting

confidence: 89%

Section: Electrochemical Characterizationsupporting

confidence: 88%

Facile Preparation of SnO2/CuO Nanocomposites as Electrocatalysts for Energy-Efficient Hybrid Water Electrolysis in the Presence of Ethanol

Pech-Rodríguez,

García-Lezama,

Sahin

2023

Energies

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“…Thus, a fuel cell system can be adapted to the location of use, utilizing whatever acceptable fuel is readily available. Hydrogen, natural gas, liquid fuels such as methanol and ethanol, and biomass-derived fuels such as urea and biogas can be used to operate fuel cells (34,39,40). Furthermore, this peculiar advantage of fuel cells ensures adopters attain higher levels of energy security in that they are not dependent on fossil fuels that are imported and highly susceptible to volatile prices (31).…”

Section: Fuel Cellsmentioning

confidence: 99%

Fuel Cells - An Overview of Their Green Value and Readiness Levels

Adeyanju

2023

Preprint

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With CO2, nitrous oxides, and methane emissions data across the African continent, this review paper quantitatively describes the health, environmental, and mortality (expressed as avoidable deaths in thousands per year) effects that the combustion of fossil fuels generates. As a solution, this research study goes further to describe, with visual aids, the technology of fuel cells, their attractive green value, the types of fuel cells including low-temperature and high-temperature fuel cells (LTFC & HTFC) that enable different applications, as well as their levels of commercialization readiness.

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“…Chiu and Lin 2019 [18] Pyrolysis in tube furnace at 700 Ghi et al 2020 [20] Dried at 50 °C for 6 h and then pyrolyzed in tube furnace at 700 No KOH:…”

Section: All Samples Exceeded 87%mentioning

confidence: 99%

Reusing Waste Coffee Grounds as Electrode Materials: Recent Advances and Future Opportunities

et al. 2022

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202200093400 billion cups per year and an annual growth of 1.3% since 2012/2013. [50,51] An average cup of coffee has roughly 11 g of ground coffee, which equates to over 9 million tons of ground coffee being brewed worldwide per annum. The global consumption of coffee over the last decade has steadily increased to over 10 million tons by 2021, and this increase is clearly illustrated by Figure 1. For every 1 kg of coffee grounds used within the beverage industry, roughly 0.9 kg is discarded as waste. This has led to millions of tons of waste coffee grounds (WCG) per year. [52] When these WCG is disposed of as landfill waste, they decompose and emit methane which is a potent greenhouse gas (25 times more potent than carbon dioxide over 100 years period) with severe adverse effects to the environment. [50] In addition, the leachates and soluble from WCG in landfill and via sewage was also found to cause DNA damage and thus induce genotoxicity in aquatic organisms. [53] In recent years, the concept of circular economy began to gain traction and most leading countries have been increasing the efforts to shift their economy toward this paradigm. Circular economy aims for economic activities to build and rebuild overall system health by reducing or eliminating the overall amount of waste in society via recycling and reusing products. [55,56] As the coffee is mainly disposed as waste after its initial brew and these WCG can pose a significant environmental risk in landfill (i.e., green gas emission and leachate-induced mutagenicity), it is imperative to find applications of WCG and thus promoting the transition to the circular economy in food industry. On the other hand, as one of the most abundant types of food waste, WCG contains a high volume of valuable sources of carbon and yet remains largely unexploited by industry at the moment. According to a study that investigated chemical, functional, and structural properties of WCG, [57] its most abundant components were found to be macro molecules of cellulose and hemicellulose structures which are polymeric structures of hexose saccharides. These two structures can account for 51.50% w/w of the total mass on a dry weight basis. Second highest component was found to be lignin, a highly aromatic structure comprised of crosslinked phenolic structures, which can be up to 40% w/w based on a sulfuric acid hydrolysis extraction. [58] The rest of WCG composition includes fatty and amino acids, polyphenols, caffeine, tannins, and minerals, [45] etc.Coffee industry produces more than eight million tons of waste coffee grounds (WCG) annually. These WCG contain caffeine, tannins, and polyphenols and can be of great environmental concern if not properly disposed of. On the other hand, components of WCG are mainly macromolecular cellulose and lignocellulose, which can be utilized as cheap carbon precursors. Accordingly, various forms of carbon materials have been reportedly synthesized from WCG, including activated carbon, mesoporous carbon, carbon nanosheets, carbon nanotubes, grap...

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Electrooxidation behavior of ethanol toward carbon microbead-encapsulated ZnO particles derived from coffee waste

Cited by 14 publications

References 42 publications

Facile Preparation of SnO2/CuO Nanocomposites as Electrocatalysts for Energy-Efficient Hybrid Water Electrolysis in the Presence of Ethanol

Facile Preparation of SnO2/CuO Nanocomposites as Electrocatalysts for Energy-Efficient Hybrid Water Electrolysis in the Presence of Ethanol

Fuel Cells - An Overview of Their Green Value and Readiness Levels

Reusing Waste Coffee Grounds as Electrode Materials: Recent Advances and Future Opportunities

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