The Effect of Annealing Temperature on Nickel on Reduced Graphene Oxide Catalysts on Urea Electrooxidation

Glass, Dean E.; Galvan, Vicente; Prakash, G. K. Surya

doi:10.1016/j.electacta.2017.09.064

Cited by 44 publications

(17 citation statements)

References 50 publications

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“…Before the analysis, the catalysts were reduced and passivated at 500 • C in order to get as much closer to reaction conditions as possible. The catalysts have a fluorite type structure for the ceria [70][71][72] and nickel in its metallic form [73]. Very accurate cell parameter for ceria were determined by Rietveld profile fitting of the XRD (XRD spectra are reported in Figure S1 in Supplementary Material) patterns: an increase in this parameter was observed due to the introduction of lanthanum, as shown in Figure 6.…”

Section: Resultsmentioning

confidence: 99%

Development of La Doped Ni/CeO2 for CH4/CO2 Reforming

Menegazzo

Pizzolitto

Ghedini

et al. 2018

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Methane dry reforming (MDR) allows the transformation of carbon dioxide and methane, the two main greenhouse gases, into syngas. Given the high endothermicity of the process, it is necessary to produce a catalytic system that is very active, selective and resistant to coking deactivation; this work focuses on the development of a heterogeneous catalyst based on nickel supported on cerium oxide. Several strategies of synthesis of the catalysts were studied with particular attention to the lanthanum addition methodology. Both supports and catalysts, fresh and used, were deeply characterized by different techniques (N2 physisorption, TPR, XRD, SEM). The effect of temperature on activity and selectivity of the different catalysts was also studied. A positive effect of lanthanum addition is strongly related to the synthetic methodology. Incipient wetness impregnation of lanthanum precursor on an already calcined ceria has led to the best catalytic activity. This behaviour is due to a more effective interaction between nickel and the support, which results in a higher dispersion of the active phase. The structural modifications have led to an improvement of the redox pump of the ceria, reducing the formation of coke during the reaction and improving the stability on time on stream.

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Section: Resultsmentioning

confidence: 99%

Development of La Doped Ni/CeO2 for CH4/CO2 Reforming

Menegazzo

Pizzolitto

Ghedini

et al. 2018

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“…In the three catalysts, a fluorite-type structure of ceria is present with characteristic peaks at 2θ = 28°, 33°, 47°, 56°, and 59°associated with (111), ( 200), ( 220), (311), and (222) of the cubic phase, respectively. 39,40 The characteristic peak at 2θ = 43.4°and 52.0°indicates that nickel is present in its metallic phase, and the peaks are respectively associated with (111) and (200) Miller indexes of fcc nickel 41 By means of the Rietveld method, the mean size of Ni 0 was calculated: 17 nm for Ni−Ce, 10 nm for Ni−La−Ce, and 14 nm for co−Ni−La−Ce. Lanthanum in this case influences the nickel particle size, leading to a slight decrease of its dimension.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The characteristic peak at 2θ = 43.4° and 52.0° indicates that nickel is present in its metallic phase, and the peaks are respectively associated with (111) and (200) Miller indexes of fcc nickel By means of the Rietveld method, the mean size of Ni 0 was calculated: 17 nm for Ni–Ce, 10 nm for Ni–La–Ce, and 14 nm for co–Ni–La–Ce. Lanthanum in this case influences the nickel particle size, leading to a slight decrease of its dimension.…”

Section: Resultsmentioning

confidence: 99%

Increase of Ceria Redox Ability by Lanthanum Addition on Ni Based Catalysts for Hydrogen Production

Pizzolitto

Menegazzo

Ghedini

et al. 2018

ACS Sustainable Chem. Eng.

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The effects of lanthanum addition in Ni/CeO 2 catalysts were investigated. The influence of synthetic procedures, namely, impregnation or coprecipitation of lanthanum and cerium oxide, were evaluated. Materials were analyzed by BET, AAS, DRIFT-MS, TPR, OSC, XRD, and SEM-EDX. Samples were tested in ethanol steam reforming (ESR). Both lanthanumpromoted samples exhibited a higher stability in time than nonpromoted catalyst. Nonetheless, catalytic behavior is strongly affected by the preparation method. TPR, OSC, and XRD analyses showed that the coprecipitation method allowed the best interaction between ceria and lanthana, leading to an increased redox ability and best catalytic performances as a result. A catalyst with a support prepared via the coprecipitation method showed ethanol conversion of 90% and hydrogen selectivity higher than 70% even after 60 h of reaction.

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“…The equivalent circuit of the bode circuit is composed of ohmic resistance (Rs) that clear from the intersection at high frequency with the X-axis (inset of Fig. 7), the semi circuit appears at medium frequency is modeled by double layer capacitance (CPE1) in parallel to charge transfer resistance (Rkin), and the semicircuit at the low frequency is modeled by a another double layer capacitance (CPE2) that is in parallel to mass transfer resistance (Rmass) [62] as can be seen in Fig. 7b.…”

Section: Electrochemical Performancesmentioning

confidence: 99%

Two dimensional Cu based nanocomposite materials for direct urea fuel cell

Hussain

Abdelkareem

Alawadhi

et al. 2021

International Journal of Hydrogen Energy

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In this work, Cu2O nanoparticles were successfully prepared onto the surface of twodimensional graphitic carbon nitride (g-C3N4) by using a simple solution chemistry approach.An environment-friendly reducing agent, glucose, was used for the synthesis of Cu2O NPs onto the surface of g-C3N4 without using any surfactant or additives. The surface composition, crystalline structure, morphology, as well as other properties have been investigated using XPS, XRD, SEM, FTIR, FESEM, EDS, etc. The electrochemical measurements of the prepared materials demonstrated that Cu2O exhibited a weak oxidation activity towards urea, while g-C3N4 has no activity towards urea oxidation. The Cu2O supported on the surface of g-C3N4 (Cu2O-g-C3N4) demonstrated a significant activity towards urea oxidation that reached two times that of the unsupported one. The significant increase in the performance was related to the synergetic effect between the Cu2O and g-C3N4 support. The prepared composite materials demonstrated high stability towards urea oxidation as confirmed from the stable current discharge for around three hours without any noticeable degradation performance.

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The Effect of Annealing Temperature on Nickel on Reduced Graphene Oxide Catalysts on Urea Electrooxidation

Cited by 44 publications

References 50 publications

Development of La Doped Ni/CeO2 for CH4/CO2 Reforming

Development of La Doped Ni/CeO2 for CH4/CO2 Reforming

Increase of Ceria Redox Ability by Lanthanum Addition on Ni Based Catalysts for Hydrogen Production

Two dimensional Cu based nanocomposite materials for direct urea fuel cell

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