High-performance IN738 superalloy derived from turbine blade waste for efficient ethanol, ethylene glycol, and urea electrooxidation

Hefnawy, Mahmoud A.; Medany, Shymaa S.; El‐Sherif, Rabab M.; El-Bagoury, Nader; Fadlallah, Sahar A.

doi:10.1007/s10800-023-01862-7

Cited by 18 publications

(15 citation statements)

References 69 publications

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“…The diffusion coefficient (D) can be estimated using the Randles–Sevcik equation for irreversible process as follows [ 56 , 57 , 58 , 59 , 60 , 61 , 62 ]: I p = 2.99 × 10 5 n A C o [(1 − α) n o D ʋ] 0.5 where, i is the nitrite’s oxidation current, n is the number of electrons (n = 1), A is the electrode’s surface area, D is the analyte diffusion coefficient, C o is the analyte concentration, and

is the scan rate.…”

Section: Resultsmentioning

confidence: 99%

“…The Cottrell equation [70][71][72] was used to determine the average diffusion coefficient of nitrite molecules at a GC/Zn-Chit-modified electrode at a potential of 0.85 V (vs. Ag/AgCl) in a solution of 0.05 M PBS and several nitrite concentrations, as follows: The diffusion coefficient (D) can be estimated using the Randles-Sevcik equation for irreversible process as follows [56][57][58][59][60][61][62]:…”

Section: Zn-chit Composite For Nitrite Detectionmentioning

confidence: 99%

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Zinc Nanocomposite Supported Chitosan for Nitrite Sensing and Hydrogen Evolution Applications

et al. 2023

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Nanoparticles of ZnO-Chitosan (Zn-Chit) composite were prepared using precipitation methods. Several analytical techniques, such as scanning electron microscope (SEM), transmitted electron microscope (TEM), powder X-ray diffraction (XRD), infrared spectroscopy (IR), and thermal analysis, were used to characterize the prepared composite. The activity of the modified composite was investigated for nitrite sensing and hydrogen production applications using various electrochemical techniques. A comparative study was performed for pristine ZnO and ZnO loaded on chitosan. The modified Zn-Chit has a linear range of detection 1–150 µM and a limit of detection (LOD) = 0.402 µM (response time ~3 s). The activity of the modified electrode was investigated in a real sample (milk). Furthermore, the anti-interference capability of the surface was utilized in the presence of several inorganic salts and organic additives. Additionally, Zn-Chit composite was employed as an efficient catalyst for hydrogen production in an acidic medium. Thus, the electrode showed long-term stability toward fuel production and enhanced energy security. The electrode reached a current density of 50 mA cm−2 at an overpotential equal to −0.31 and −0.2 V (vs. RHE) for GC/ZnO and GC/Zn-Chit, respectively. Electrode durability was studied for long-time constant potential chronoamperometry for 5 h. The electrodes lost 8% and 9% of the initial current for GC/ZnO and GC/Zn-Chit, respectively.

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is the scan rate.…”

Section: Resultsmentioning

confidence: 99%

Section: Zn-chit Composite For Nitrite Detectionmentioning

confidence: 99%

Zinc Nanocomposite Supported Chitosan for Nitrite Sensing and Hydrogen Evolution Applications

et al. 2023

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“…The diffusion coefficient of nitrite toward the electrode was estimated by different sweep rates experiments using the Randles-Sevik equation as follows [ 59 , 60 , 61 , 62 ]:

where: i p : anodic current, n : electron numbers, A: electrode area, D : nitrite diffusion coefficient, C: nitrite concentration,

: sweep rate.…”

Section: Resultsmentioning

confidence: 99%

Polyaniline-Supported Nickel Oxide Flower for Efficient Nitrite Electrochemical Detection in Water

et al. 2023

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A modified electrode with conducting polymer (Polyaniline) and NiO nanoflowers was prepared to detect nitrite ions in drinking water. A simple method was used to prepare the NiO nanoflower (NiOnF). Several techniques characterized the as-prepared NiOnF to determine the chemical structure and surface morphology of the NiO, such as XRD, XPS, FT-IR, and TGA. The activity of the electrode toward nitrite sensing was investigated over a wide range of pH (i.e., 2 to 10). The amperometry method was used to determine the linear detection range and limit. Accordingly, the modified electrode GC/PANI/NiOnf showed a linear range of detection at 0.1–1 µM and 1–500 µM. At the same time, the limit of detection (LOD) was 9.7 and 64 nM for low and high concentrations, respectively. Furthermore, the kinetic characteristics of nitrite, such as diffusion and transport coefficients, were investigated in various media. Moreover, the charge transfer resistance was utilized for nitrite electrooxidation in different pH values by the electrochemical impedance technique (EIS). The anti-interfering criteria of the modified surfaces were utilized in the existence of many interfering cations in water (e.g., K+, Na+, Cu2+, Zn2+, Ba2+, Ca2+, Cr2+, Cd2+, Pd2+). A real sample of the Nile River was spiked with nitrite to study the activity of the electrode in a real case sample (response time ~4 s). The interaction between nitrite ions and NiO{100} surface was studied using DFT calculations as a function of adsorption energy.

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“…Because of the electrochemical activity of retained redox species at the surface of the modified electrocatalysts, straight line relationships were observed. The surface coverage (Γ) values of electrocatalysts could be estimated using Equation (2) [ 50 ] and the slope values of the obtained linear plots:

where Ip is the current of the urea oxidation peak, A is the electrode surface area, and Γ is the redox species surface coverage in mol cm 2 . Table 1 shows the average Γ value for the anodic and cathodic sides of all prepared, GC/NiO, GC/NiFe 2 O 4 , and GC/NiFe 2 O 4 @GO electrocatalysts.…”

Section: Resultsmentioning

confidence: 99%

Modified NiFe2O4-Supported Graphene Oxide for Effective Urea Electrochemical Oxidation and Water Splitting Applications

Alamro,

Medany,

Al-Kadhi

et al. 2024

Molecules

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The production of green hydrogen using water electrolysis is widely regarded as one of the most promising technologies. On the other hand, the oxygen evolution reaction (OER) is thermodynamically unfavorable and needs significant overpotential to proceed at a sufficient rate. Here, we outline important structural and chemical factors that affect how well a representative nickel ferrite-modified graphene oxide electrocatalyst performs in efficient water splitting applications. The activities of the modified pristine and graphene oxide-supported nickel ferrite were thoroughly characterized in terms of their structural, morphological, and electrochemical properties. This research shows that the NiFe2O4@GO electrode has an impact on both the urea oxidation reaction (UOR) and water splitting applications. NiFe2O4@GO was observed to have a current density of 26.6 mA cm−2 in 1.0 M urea and 1.0 M KOH at a scan rate of 20 mV s−1. The Tafel slope provided for UOR was 39 mV dec−1, whereas the GC/NiFe2O4@GO electrode reached a current of 10 mA cm−2 at potentials of +1.5 and −0.21 V (vs. RHE) for the OER and hydrogen evolution reaction (HER), respectively. Furthermore, charge transfer resistances were estimated for OER and HER as 133 and 347 Ω cm2, respectively.

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High-performance IN738 superalloy derived from turbine blade waste for efficient ethanol, ethylene glycol, and urea electrooxidation

Cited by 18 publications

References 69 publications

Zinc Nanocomposite Supported Chitosan for Nitrite Sensing and Hydrogen Evolution Applications

Zinc Nanocomposite Supported Chitosan for Nitrite Sensing and Hydrogen Evolution Applications

Polyaniline-Supported Nickel Oxide Flower for Efficient Nitrite Electrochemical Detection in Water

Modified NiFe2O4-Supported Graphene Oxide for Effective Urea Electrochemical Oxidation and Water Splitting Applications

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