Enhancing activity and durability of Pd nanoparticle electrocatalyst by ceria undercoating on carbon support

Shi, Wenjuan; Park, Ah-Hyeon; Park, Hyun-Uk; Kwon, Young‐Uk

doi:10.1016/j.jcat.2020.02.010

Cited by 15 publications

(8 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The XPS survey spectra of Pt/MWCNTs-W, Pt/MWCNTs-D, and Pt 1 (CeO 2 ) 0.5 /MWCNTs-D catalysts are presented in Figure S3, and the signals of Pt 4f (73.4 eV), C 1s (283.8 eV), Pt 4d (315.1 eV), and O 1s (531.9 eV) are all observed in three catalysts. , Moreover, the signal of Ce 3d is only observed in Pt 1 (CeO 2 ) 0.5 /MWCNTs-D, further proving that CeO 2 nanoparticles have been effectively attached onto the MWCNTs. Compared with the other literature studies, ,,− the CeO 2 prepared in DESs was more uniformly modified on the carbon carrier. In the Ce 3d spectrum, the peaks at 881.8 and 885.1 eV are the characteristic peaks of Ce 4+ of CeO 2 , and the peaks at 900.5 and 903.8 eV are assigned to Ce 3+ of Ce 2 O 3 (Figure A) .…”

Section: Resultsmentioning

confidence: 66%

Pt₁(CeO₂)_0.5 Nanoparticles Supported on Multiwalled Carbon Nanotubes for Methanol Electro-oxidation

Yang

Devasenathipathy

et al. 2021

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Deep eutectic solvents (DESs), regarded as an analogue of ionic liquids, consist of Brønsted or Lewis acids mixed with certain bases. These solvents are ideal around room temperature and possess a considerably low melting point relative to the involved single components. The important features of DESs including conductivity, high viscosity, biodegradability, and surface tension make them promising green sustainable media for the synthesis of various nanomaterials, which have been used in the field of energy and environment in the recent 5 years. Herein, synthesis of ultrafine Pt 1 (CeO 2 ) 0.5 -decorated multiwalled carbon nanotube nanoelectrocatalysts (Pt 1 (CeO 2 ) 0.5 /MWCNTs-D) was performed using the DESs. We found that DESs play a vital role in the synthesis of uniform dispersion and ultrafine nanoparticles to strengthen the interaction of CeO 2 and Pt, as well as the controllable synthesis of CeO 2 . Furthermore, the addition of CeO 2 not only slightly promotes Pt(II) content but also can obviously enhance the electrochemical performance of Pt 1 (CeO 2 ) 0.5 /MWCNTs-D. The catalyst exhibits better CO antipoisoning capability and greater catalytic performance (onset potential: 0.44 V and peak current: 641.6 mA mg Pt −1) toward methanol oxidation than that of Pt/MWCNTs-W synthesized in water (0.58 V and 229.9 mA mg Pt −1 ) and Pt/MWCNTs-D synthesized in DESs (0.55 V and 459.2 mA mg Pt −1). The main features of Pt 1 (CeO 2 ) 0.5 /MWCNTs-D such as higher peak current, lower oxidation potential, CO antipoisoning capability, and larger electrochemical active surface area toward oxidation of methanol can benefit the construction of highly electroactive Pt-based nanomaterials for the direct methanol fuel cell applications.

show abstract

Section: Resultsmentioning

confidence: 66%

Pt₁(CeO₂)_0.5 Nanoparticles Supported on Multiwalled Carbon Nanotubes for Methanol Electro-oxidation

Yang

Devasenathipathy

et al. 2021

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…Due to its unique properties, palladium (Pd) plays an important role in the catalytic industry. − In combination with CeO 2 , Pd is used as an active component in many catalytic processes, including exhaust gas after-treatment. − However, the nature of the Pd species responsible for the high activity of the Pd/CeO 2 catalysts in hydrocarbon or CO oxidation reactions still remains a topic of discussion. The authors consider different Pd species to be active in the catalytic reactions: metallic Pd nanoparticles, coordination-unsaturated Pd 2+ on CeO 2 , isolated Pd atoms in the form of Pd 1 O and Pd 1 O 2 on CeO 2 , , PdO x clusters, − PdO nanoparticles, , Pd x Ce 1– x O 2−δ solid solutions, ,,, and Pd@CeO 2 core–shell structures. , The charge state of Pd in the abovementioned species does not exceed +2.…”

Section: Introductionmentioning

confidence: 99%

Probing of Pd⁴⁺ Species in a PdO_x–CeO₂ System by X-Ray Photoelectron Spectroscopy

et al. 2021

View full text Add to dashboard Cite

The oxidized palladium nanoparticles comprising Pd4+ species were prepared by radio frequency (RF) discharge in an O2 atmosphere and analyzed with X-ray photoelectron spectroscopy. PdO x particles were deposited on CeO2 or the reference support (Ta2O5) with variation of the RF sputtering time. Regardless of the used support, small PdO x particles (d < 1 nm) contained only Pd2+ species, while an increase of the particle size led to the appearance of the additional oxidized Pd statePd4+. The stabilization of Pd4+ on the surface of defect PdO particles was proposed. The Pd4+ species in the PdO x /CeO2 system was stable during heating in ultra-high vacuum conditions up to 250 °C. Pd4+ species demonstrated a high reaction probability toward CO oxidation at room temperature. However, a transition from the relatively inert support (Ta2O5) to the reducible oxide (CeO2) did not lead to a significant improvement of the Pd4+ reaction probability. Pd4+ species could not be recovered by the exposure of the reduced systems to molecular oxygen at room temperature. The obtained results bring new insights into consideration of Pd4+ species as active sites for oxidation processes at low temperatures.

show abstract

“…So far, carbon-supported precious metals (e.g., Pt, Pd, etc.) are regarded as the most effective catalysts to boost the sluggish kinetics of these reactions [20][21][22][23]. Unfortunately, their high cost, limited reserves, and low stabilities have hindered practical applications [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of noble metal-based intermetallic electrocatalysts by space-confined pyrolysis: Recent progress and future perspective

Zhao

Wang

et al. 2021

Journal of Energy Chemistry

View full text Add to dashboard Cite

Enhancing activity and durability of Pd nanoparticle electrocatalyst by ceria undercoating on carbon support

Cited by 15 publications

References 53 publications

Pt₁(CeO₂)_0.5 Nanoparticles Supported on Multiwalled Carbon Nanotubes for Methanol Electro-oxidation

Pt₁(CeO₂)_0.5 Nanoparticles Supported on Multiwalled Carbon Nanotubes for Methanol Electro-oxidation

Probing of Pd⁴⁺ Species in a PdO_x–CeO₂ System by X-Ray Photoelectron Spectroscopy

Synthesis of noble metal-based intermetallic electrocatalysts by space-confined pyrolysis: Recent progress and future perspective

Contact Info

Product

Resources

About

Enhancing activity and durability of Pd nanoparticle electrocatalyst by ceria undercoating on carbon support

Cited by 15 publications

References 53 publications

Pt1(CeO2)0.5 Nanoparticles Supported on Multiwalled Carbon Nanotubes for Methanol Electro-oxidation

Pt1(CeO2)0.5 Nanoparticles Supported on Multiwalled Carbon Nanotubes for Methanol Electro-oxidation

Probing of Pd4+ Species in a PdOx–CeO2 System by X-Ray Photoelectron Spectroscopy

Synthesis of noble metal-based intermetallic electrocatalysts by space-confined pyrolysis: Recent progress and future perspective

Contact Info

Product

Resources

About

Pt₁(CeO₂)_0.5 Nanoparticles Supported on Multiwalled Carbon Nanotubes for Methanol Electro-oxidation

Pt₁(CeO₂)_0.5 Nanoparticles Supported on Multiwalled Carbon Nanotubes for Methanol Electro-oxidation

Probing of Pd⁴⁺ Species in a PdO_x–CeO₂ System by X-Ray Photoelectron Spectroscopy