Aqueous co-precipitation of Pd-doped cerium oxide nanoparticles: chemistry, structure, and particle growth

Liang, Hongying; Raitano, Joan M.; He, Guanghui; Akey, Austin; Herman, Irving P.; Zhang, Lihua; Chan, Siu‐Wai

doi:10.1007/s10853-011-5798-8

Cited by 45 publications

(20 citation statements)

References 43 publications

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“…For the CO oxidation reactions, the oxidation rates are found to be high for both the support (CeO 2 ) and metal-doped support as shown in Table 4. Our observed activation energies were in fairly good agreement with the literature reports [27,29,[46][47][48]. Although for the different doped metals on the different supports, the activation energies were rather deviated from our results [49][50][51][52][53][54][55], but in good agreement with same oxide support and the doped metal.…”

Section: Kinetic Parameters and Roles Of Interface/surface Areasupporting

confidence: 89%

Thermal H2-treatment effects on CO/CO2 conversion over Pd-doped CeO2 comparison with Au and Ag-doped CeO2

Park

Kim

Pradhan

et al. 2014

Reac Kinet Mech Cat

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CO oxidation to CO 2 by Pd-CeO 2 catalysts was tested by temperatureprogrammed mass spectrometry for as-prepared and thermal H 2 -treated Pd-doped CeO 2 catalysts, compared with those of Ag and Au-doped CeO 2 . For the as-prepared samples, the oxidation rate and the T 10 % (the temperature at 10 % CO conversion) occurred in the order of Au & Pd [ Ag ) undoped in the 1st CO oxidation run, while in the 2nd run, the order became Au [ Pd [ Ag ) undoped. For the thermal H 2 -treated samples, the order became Pd [ Au [ Ag [ undoped and Au [ Pd [ Ag [ undoped in the 1st and 2nd CO oxidation runs, respectively. The T 10 % in the 2nd run commonly occurred at much lower temperatures for the metal-doped CeO 2 upon achieving good metal-oxide interfacial contact during the 1st run. The T 10 % of undoped CeO 2 was the most significantly affected by the thermal treatment effects while those of metal-doped CeO 2 catalysts were not greatly affected by the thermal H 2 -treatment. Based on these findings, the metal-support interaction/interface is more important than the surface area, Au (88 m 2 /g) [ Ag (59 m 2 /g) & Pd & undoped.

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Section: Kinetic Parameters and Roles Of Interface/surface Areasupporting

confidence: 89%

Thermal H2-treatment effects on CO/CO2 conversion over Pd-doped CeO2 comparison with Au and Ag-doped CeO2

Park

Kim

Pradhan

et al. 2014

Reac Kinet Mech Cat

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“…Ultraviolet (UV) visible spectroscopy is commonly used to estimate the band gap of materials. It is reported that the energy band gap of CeO 2 depends on defects generated due to doping . To confirm the presence of oxygen vacancies in the synthesized samples, the UV absorption spectrum of the sintered powder of the samples was recorded in the wavelength range 200 to 1000 nm and shown in Figure A.…”

Section: Resultsmentioning

confidence: 75%

“…It is reported that the energy band gap of CeO 2 depends on defects generated due to doping. 26 To confirm the presence of oxygen vacancies in the synthesized samples, the UV absorption spectrum of the sintered powder of the samples was recorded in the wavelength range 200 to 1000 nm and shown in Figure 7A. The UV-visible spectrum of both the samples is the same, an intense peak is seen at 339 nm in the spectrum.…”

Section: Uv-visible Spectroscopymentioning

confidence: 98%

Sucrose‐nitrate auto combustion synthesis of Ce _0.85 Ln _0.10 Sr _0.05 O _{2‐
δ} (Ln = La and Gd) electrolytes for solid oxide fuel cells

et al. 2020

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Summary Nanocrystalline powders of co‐doped ceria oxides Ce0.85La0.10Sr0.05O2‐δ (CLSO) and Ce0.85Gda0.10Sr0.05O2‐δ (CGSO) have been synthesized by auto combustion method at 100°C using sucrose as fuel. Thermal analysis (TGA/DSC) of as‐prepared powders indicated calcination above 400°C to remove organic residue. The average grain size of the pellets sintered at 1200°C for 4 hours is 436 and 683 nm for CLSO and CGSO, respectively. The electrical conductivity of the sintered samples was determined by impedance measurements in the temperature range 300°C to 600°C and the frequency range 20 Hz to 2 MHz. At 600°C, the total electrical conductivity (σt) of CGSO is 6.78 × 10−3 S cm−1, 2.5 times higher than 2.72 × 10−3 S cm−1 of CLSO. Further, it is found that the value of grain boundaries blocking factor (αgb) of CGSO is 0.47 which is 30% lesser than 0.68 of CLSO at 600°C. The higher value of electrical conductivity of CGSO as compared to CLSO is attributed to the lesser blocking effect of grain boundaries, smaller lattice distortion and denser microstructure of CGSO as compared to CLSO. The electrical conductivity of synthesized samples has been compared with the electrical conductivity of similar compositions of co‐doped CeO2 oxides. Our study indicated that the sintering temperature, and hence, the morphology of sintered samples has a significant role in determining the electrical conductivity. The presence of oxygen vacancies in the synthesized samples is experimentally supported by using UV‐visible spectroscopy, Raman spectroscopy, and thermal analysis techniques.

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“…† Metal-oxygen bonds and lattice defects in ceria have been characterized in detail by Raman spectroscopy. [47][48][49][50] In contrast to the 524.5 nm laser used in previous studies, 15 spectra were recorded with a 780 nm diode laser to obtain more detailed subsurface information due to enhanced penetration depth. Raman spectra of all phase pure samples are compared to pristine ceria in Fig.…”

Section: Characterization Of Ceria Before and Aer Co 2 Reductionmentioning

confidence: 99%

Trends in the phase stability and thermochemical oxygen exchange of ceria doped with potentially tetravalent metals

et al. 2017

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Aqueous co-precipitation of Pd-doped cerium oxide nanoparticles: chemistry, structure, and particle growth

Cited by 45 publications

References 43 publications

Thermal H2-treatment effects on CO/CO2 conversion over Pd-doped CeO2 comparison with Au and Ag-doped CeO2

Thermal H2-treatment effects on CO/CO2 conversion over Pd-doped CeO2 comparison with Au and Ag-doped CeO2

Sucrose‐nitrate auto combustion synthesis of Ce _0.85 Ln _0.10 Sr _0.05 O _{2‐
δ} (Ln = La and Gd) electrolytes for solid oxide fuel cells

Trends in the phase stability and thermochemical oxygen exchange of ceria doped with potentially tetravalent metals

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Aqueous co-precipitation of Pd-doped cerium oxide nanoparticles: chemistry, structure, and particle growth

Cited by 45 publications

References 43 publications

Thermal H2-treatment effects on CO/CO2 conversion over Pd-doped CeO2 comparison with Au and Ag-doped CeO2

Thermal H2-treatment effects on CO/CO2 conversion over Pd-doped CeO2 comparison with Au and Ag-doped CeO2

Sucrose‐nitrate auto combustion synthesis of Ce 0.85 Ln 0.10 Sr 0.05 O 2‐ δ (Ln = La and Gd) electrolytes for solid oxide fuel cells

Trends in the phase stability and thermochemical oxygen exchange of ceria doped with potentially tetravalent metals

Contact Info

Product

Resources

About

Sucrose‐nitrate auto combustion synthesis of Ce _0.85 Ln _0.10 Sr _0.05 O _{2‐
δ} (Ln = La and Gd) electrolytes for solid oxide fuel cells