Hydrogen evolution reaction on single crystal WO3/C nanoparticles supported on carbon in acid and alkaline solution

Zheng, Hua; Mathe, Mkhulu

doi:10.1016/j.ijhydene.2010.11.052

Cited by 54 publications

(28 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The practical measurement of the electrode activity determinates the overpotential for a constant current density which is 0.60 mA cm −2 in our studies, which is higher 48,49,[55][56][57] The high exchange current density of Pd-rGO is implied the lower intrinsic resistance for electronic diffusion in the electrochemical reactions. Throughout from Tafel slope, the number of electron related with hydrogen evolution was also calculated.…”

Section: Resultsmentioning

confidence: 53%

“…The value of α is 0.5 when the rds is Volmer reaction step; the value of α is 1.5 when the rds is Heyrovsky reaction step; the value of α is 2 when the rds is step Tafel reaction. 49 In addition, the Tafel slope b = 122 mV deg −1 for HER on Pd-rGO/GCE in this work, α = 1.83 calculated from b = 2.303RT /(αF ). Therefore, Tafel reaction step supposed to be rds for HER on Pd-rGO/GCE.…”

Section: Resultsmentioning

confidence: 64%

See 1 more Smart Citation

Sol–gel synthesis of palladium nanoparticles supported on reduced graphene oxide: an active electrocatalyst for hydrogen evolution reaction

CHEKIN

2015

Bull Mater Sci

View full text Add to dashboard Cite

In this work, the synthesis and characterization of palladium nanoparticle-reduced graphene oxide hybrid (Pd-rGO) material is reported. Techniques of X-ray diffraction, transmission electron microscope (TEM), energy-dispersive X-ray, FT-IR spectroscopy, thermogravimetric analysis and cyclic voltammetry were used to characterize the structure and properties of the Pd-rGO. Results demonstrate the effect of Pd on the reduced GO. The average particle size of the Pd nanoparticles supported on rGO obtained from TEM is about 12-18 nm. Moreover, glassy carbon electrode (GCE) modified with palladium nanoparticle-graphene oxide hybrid (Pd-rGO/GCE) was prepared by casting of the Pd-rGO solution on GCE. The electrochemical and catalytic activity of the Pd-rGO/GCE was studied in 0.1 M H 2 SO 4 solution. The Pd-rGO/GCE electrode exhibited remarkable electrocatalytic activity for the hydrogen evolution reaction (HER). At potential more negative than −0.4 V vs. Ag|AgCl|KCl 3M , the current is mainly due to hydrogen evolution reaction. Finally, the kinetic parameters of hydrogen evolution reaction are also discussed on the Pd-rGO/GCE.

show abstract

Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 64%

Sol–gel synthesis of palladium nanoparticles supported on reduced graphene oxide: an active electrocatalyst for hydrogen evolution reaction

CHEKIN

2015

Bull Mater Sci

View full text Add to dashboard Cite

show abstract

“…This is one of the biggest obstacles hindering the development of WO 3 as a practical photocatalyst. 2,19 One possible technique of improving the efficiency of electron-hole pair separation in WO 3 is to dope WO 3 with other elements or compound (Ag, C, S, P, and TiO 2 ). Graphene (GR), with a flat monolayer of carbon atoms tightly packed into a two-dimensional honeycomb lattice, is a very promising candidate for high performance photocatalyst because of its high thermal conductivity, 23 excellent mobility of charge carriers (20 000 cm 2 V 21 s 21 at room temperature), 24 and a large specific surface area (2630 m 2 g…”

Section: Introductionmentioning

confidence: 99%

Synthesis of WO₃@Graphene composite for enhanced photocatalytic oxygen evolution from water

et al. 2012

View full text Add to dashboard Cite

Abstract"Nano tungsten oxide (WO3) particles were synthesized on the surface of graphene (GR) sheets by using a simple sonochemical method. The obtained composite, WO3@GR, was characterized by X-ray diffraction, N-2 adsorption/desorption analysis, thermo-gravimetric analysis, Raman spectroscopy and UV-vis diffuse reflectance spectra measurements. It was found that chemical bonds between the nano WO3 particles and the GR sheets were formed. The average particle size of the WO3 was evidenced to be around 12 nm on the GR sheets. When used as photocatalyst for water splitting, the amount of evolved O-2 from water for the WO3@GR composite with 40 wt% GR inside was twice and 1.8 times as much as that for pure WO3 and mixed-WO3/GR, respectively. The excellent photocatalytic property of the WO3@GR composite is due to the synergistic effects of the combined nano WO3 particles and GR sheets. The sensitization of WO3 by GR enhances the visible light absorption property of WO3@GR. The chemical bonding between WO3 and GR minimizes the interface defects, reducing the recombination of the photo-generated electron-hole pairs. Furthermore, the GR sheets in the WO3@GR composite enhance electrons transport by providing low resistance conduction pathways, leading to improved photo-conversion efficiency. The methodology opens up a new way of obtaining photoactive GR-semiconductor composites for photodissociating water under visible light." Nano tungsten oxide (WO 3 ) particles were synthesized on the surface of graphene (GR) sheets by using a simple sonochemical method. The obtained composite, WO 3 @GR, was characterized by X-ray diffraction, N 2 adsorption/desorption analysis, thermo-gravimetric analysis, Raman spectroscopy and UV-vis diffuse reflectance spectra measurements. It was found that chemical bonds between the nano WO 3 particles and the GR sheets were formed. The average particle size of the WO 3 was evidenced to be around 12 nm on the GR sheets. When used as photocatalyst for water splitting, the amount of evolved O 2 from water for the WO 3 @GR composite with 40 wt% GR inside was twice and 1.8 times as much as that for pure WO 3 and mixed-WO 3 /GR, respectively. The excellent photocatalytic property of the WO 3 @GR composite is due to the synergistic effects of the combined nano WO 3 particles and GR sheets. The sensitization of WO 3 by GR enhances the visible light absorption property of WO 3 @GR. The chemical bonding between WO 3 and GR minimizes the interface defects, reducing the recombination of the photo-generated electron-hole pairs. Furthermore, the GR sheets in the WO 3 @GR composite enhance electrons transport by providing low resistance conduction pathways, leading to improved photo-conversion efficiency. The methodology opens up a new way of obtaining photoactive GR-semiconductor composites for photodissociating water under visible light.

show abstract

“…Zheng and Mathe prepared single crystal tungsten oxide (WO 3 ) nanoparticles via a microwave-assisted method supported on carbon black. The overall experimental results revealed that the electrocatalytic activity for HER on WO 3 /C is six order magnitude higher than those obtained with carbon black in 1 M KOH [38].…”

Section: Introductionmentioning

confidence: 70%

Synthesis and characterization of Au-modified macroporous Ni electrocatalysts for alkaline water electrolysis

González-Buch

Herrãiz‐Cardona

Ortega

et al. 2016

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Au nanoparticles (Au-NPs) were successfully synthesized and incorporated into the surface of a macroporous Ni electrode fabricated via galvanostatic electrodeposition at high current densities in order to produce hydrogen by means of alkaline water electrolysis. The developed electrodes were morphologically characterized by means of confocal laser scanning and field emission scanning electron microscopes. The electrocatalytic behaviour towards the hydrogen evolution reaction was studied by Tafel polarization curves and electrochemical impedance spectroscopy. It was clear that enlarging the real surface area of an electrode its catalytic activity was greatly enhanced. This improvement was further increased when Au-NPs were added to the macroporous Ni surface. In this case, the improvement was not only caused by enlarging the surface area but also by an improvement in the intrinsic catalytic activity of the alloy, as it was shown by the exchange current densities values, calculated from the real surface area.

show abstract

Hydrogen evolution reaction on single crystal WO3/C nanoparticles supported on carbon in acid and alkaline solution

Cited by 54 publications

References 29 publications

Sol–gel synthesis of palladium nanoparticles supported on reduced graphene oxide: an active electrocatalyst for hydrogen evolution reaction

Sol–gel synthesis of palladium nanoparticles supported on reduced graphene oxide: an active electrocatalyst for hydrogen evolution reaction

Synthesis of WO₃@Graphene composite for enhanced photocatalytic oxygen evolution from water

Synthesis and characterization of Au-modified macroporous Ni electrocatalysts for alkaline water electrolysis

Contact Info

Product

Resources

About

Hydrogen evolution reaction on single crystal WO3/C nanoparticles supported on carbon in acid and alkaline solution

Cited by 54 publications

References 29 publications

Sol–gel synthesis of palladium nanoparticles supported on reduced graphene oxide: an active electrocatalyst for hydrogen evolution reaction

Sol–gel synthesis of palladium nanoparticles supported on reduced graphene oxide: an active electrocatalyst for hydrogen evolution reaction

Synthesis of WO3@Graphene composite for enhanced photocatalytic oxygen evolution from water

Synthesis and characterization of Au-modified macroporous Ni electrocatalysts for alkaline water electrolysis

Contact Info

Product

Resources

About

Synthesis of WO₃@Graphene composite for enhanced photocatalytic oxygen evolution from water