Design of electrocatalysts with reduced Pt content supported on mesoporous NiWO4 and NiWO4-graphene nanoplatelets composite for oxygen reduction and hydrogen oxidation in acidic medium

Şomăcescu, Simona; Osiceanu, Petre; Moreno, José María Calderón; Culiță, Daniela C.; Neaţu, Florentina; Trandafir, Mihaela M.; Neaţu, Ştefan; Kuncser, Andrei; Szijjártó, Gábor P.; Tálas, Emı́lia; Tompos, András; Borbáth, Irina; Florea, Mihaela

doi:10.1016/j.ijhydene.2022.04.270

Cited by 13 publications

(8 citation statements)

References 94 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These NW-attributed results agree with JCPDS Card No. 72-0480 . The XRD patterns of CW were indexed based on the crystallographic data of CoWO 4 (JCPDS Card No.…”

Section: Resultsmentioning

confidence: 99%

“…Under illuminated conditions, chronoamperometric photocurrent and electrochemical impedance spectroscopy (EIS) measurements were performed to determine the charge transfer resistance at a potential of 0 V vs Ag/AgCl with an AC voltage in the frequency range from 1 Hz to 100 kHz. 41 The XRD patterns of CW were indexed based on the crystallographic data of CoWO 4 (JCPDS Card No. 15-0867).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Facile Synthesis and Characterization of Novel Carbon Nanofiber-Doped MWO₄ (M–Mn, Co, Ni, Mn–Co, Mn–Ni, Ni–Co)-Based Nanostructured Electrode Materials for Application in Electrochemical Supercapacitors and Photoelectrochemical Water Splitting

et al. 2022

View full text Add to dashboard Cite

More efficient, clean, and renewable energy sources must be developed to replace fossil fuels and protect the environment from their harmful effects. Electrochemical energy storage devices and energy conversion (hydrogen production) sources are two effective approaches for replacing fossil fuels. Herein, single metal tungstates, such as MnWO 4 flakes, NiWO 4 nanoparticles, and CoWO 4 nanoparticles, as well as bimetallic tungstates, such as MnNiWO 4 , MnCoWO 4 , and NiCoWO 4 , were synthesized using a simple hydrothermal method. Furthermore, carbon nanofibers (CNFs) were adopted to modify bimetallic tungstate to improve the electron transfer and extraction of electron−hole pairs. To modify the CNFs with bimetallic tungstate as a composite electrode, a simple and convenient process called the wet impregnation method was employed. The resulting composite materials exhibited better performances in supercapacitor and photoelectrochemical water-splitting studies than those of single and bimetallic tungstates. The hybrid composite, MnNiWO 4 /CNF, showed a high specific capacity of 1374 F g −1 at a current density of 0.5 A g −1 in a three-electrode configuration, owing to its nonfaradaic and faradaic processes. This performance was 4.2, 10.3, and 3 orders of magnitude higher than those of MnWO 4 , NiWO 4 , and MnNiWO 4 electrodes, respectively. In photoelectrochemical water-splitting studies, the development of heterostructures decreases electron−hole recombination and improves interfacial charge transfer in composite materials. In this study, the MnNiWO 4 /CNF nanocomposite material exhibited a maximum applied bias photon-to-current efficiency (ABPE) of 3.47%, approximately 6, 6, and 2 orders of magnitude higher than those of bare MnWO 4 , NiWO 4 , and MnNiWO 4 , respectively, under illumination. The crystallinities, morphologies, absorptions, and chemical compositions of the synthesized materials were investigated using electrochemical and spectroscopic techniques. The results indicate that the synthesized hybrid materials could be promising candidates as electrode materials for remarkable supercapacitor and photoelectrochemical water-splitting applications.

show abstract

“…These NW-attributed results agree with JCPDS Card No. 72-0480 . The XRD patterns of CW were indexed based on the crystallographic data of CoWO 4 (JCPDS Card No.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Facile Synthesis and Characterization of Novel Carbon Nanofiber-Doped MWO₄ (M–Mn, Co, Ni, Mn–Co, Mn–Ni, Ni–Co)-Based Nanostructured Electrode Materials for Application in Electrochemical Supercapacitors and Photoelectrochemical Water Splitting

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The test results are shown in figure 2(a), and it can be clearly seen that the NiWO 4 made by the author corresponds well to the standard card PDF # 15-755. It contains all the crystal plane structures in the standard card, with the most obvious characteristic peaks located at 19.24 • , 31.54 • , 54.62 • , 62.34 • , and 65.52 • representing the (100), (020), (−202), (−113), and (−132) crystal planes in the standard card [29][30][31][32]. This evidences the achieved preparation of the elemental.…”

Section: Xrd and Raman Analysismentioning

confidence: 99%

Graphdiyne (C_nH_2n−2)/NiWO₄ self-assembled p–n junction characterized with in situ XPS for efficient photocatalytic hydrogen production

Zhang,

Lei,

Jin

2023

2D Mater.

View full text Add to dashboard Cite

As is well known, how to deeply understand the charge separation and charge transfer capabilities of catalysts, as well as how to optimize these capabilities of catalysts to improve hydrogen production performance, remains a huge challenge. In recent years, a new type of carbon material graphdiyne (GDY) has been proposed. GDY acetylene has a special atomic arrangement that graphene does not have a two-dimensional network of sp2 and sp conjugated intersections makes it easier to construct active sites and improve photocatalytic ability. In addition, GDY also has the advantage of adjusting the bandgap of other catalysts and inhibiting carrier recombination, making it more prone to hydrogen evolution reactions. In addition to using mechanical ball milling to produce GDY, NiWO4 without precious metals was also prepared. The sheet-like structure of GDY in the composite catalyst provides a anchoring site and more active sites for the granular NiWO4. And the composite catalyst fully enhances the good conductivity of GDY and its unique ability to enhance electron transfer, greatly improving the ability of NiWO4 as a single substance. Through in-situ x-ray photoelectron spectrometer, it was demonstrated that a p–n heterojunction was constructed between GDY and NiWO4 in the composite catalyst, further enhancing the synergistic effect between the two, resulting in a hydrogen production rate of 90.92 μmol for the composite catalyst is 4.56 times higher than that of GDY and 4.97 times higher than that of NiWO4, respectively, and the stability of the composite catalyst is significantly higher than that of each single catalyst.

show abstract

“…Graphene has gained much attention as a potential Pt-based catalyst support due to its unique electronic properties, large specific surface area, and mechanical properties. − Besides, the microstructures of the graphene can be fine-tuned. For instance, holey graphene (HG) with more edge active sites and open structure can be synthesized. − The holes in holey graphene are beneficial to reduce the mass-transfer hindrance in the ORR.…”

Section: Introductionmentioning

confidence: 99%

Pt Nanoparticles Supported on Iron and Nitrogen-Doped Holey Graphene for Boosting ORR Performance

Gao

Chen

Zhan

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Developing low-platinum catalysts is considered a promising strategy to facilitate the commercialization of fuel cells. However, the electrochemical performance of such materials is often hindered by mass-transfer issues. In this study, platinum nanoparticles supported on iron and nitrogen-doped holey graphene (Pt/Fe, N-HG) were synthesized by a simple method and used as an oxygen reduction reaction (ORR) catalyst. The unique holey structure and the co-doping of Fe and N atoms are proved beneficial for not only the formation of Pt nanoparticles but also enhancing the electrochemical performance of the catalyst. Density functional theory calculations indicate that the co-doping of Fe and N atoms increases the ability to adsorb Pt, as well as enhances the Pt adsorption of O2 and oxygen-containing intermediates in the ORR. This study presents a novel approach for the controllable synthesis of multidoped holey graphene-based electrocatalysts, with optimized surface holey structures and electrochemical performances. These findings offer significant insights into the development of efficient catalysts for fuel cell applications.

show abstract

Design of electrocatalysts with reduced Pt content supported on mesoporous NiWO4 and NiWO4-graphene nanoplatelets composite for oxygen reduction and hydrogen oxidation in acidic medium

Cited by 13 publications

References 94 publications

Facile Synthesis and Characterization of Novel Carbon Nanofiber-Doped MWO₄ (M–Mn, Co, Ni, Mn–Co, Mn–Ni, Ni–Co)-Based Nanostructured Electrode Materials for Application in Electrochemical Supercapacitors and Photoelectrochemical Water Splitting

Facile Synthesis and Characterization of Novel Carbon Nanofiber-Doped MWO₄ (M–Mn, Co, Ni, Mn–Co, Mn–Ni, Ni–Co)-Based Nanostructured Electrode Materials for Application in Electrochemical Supercapacitors and Photoelectrochemical Water Splitting

Graphdiyne (C_nH_2n−2)/NiWO₄ self-assembled p–n junction characterized with in situ XPS for efficient photocatalytic hydrogen production

Pt Nanoparticles Supported on Iron and Nitrogen-Doped Holey Graphene for Boosting ORR Performance

Contact Info

Product

Resources

About

Design of electrocatalysts with reduced Pt content supported on mesoporous NiWO4 and NiWO4-graphene nanoplatelets composite for oxygen reduction and hydrogen oxidation in acidic medium

Cited by 13 publications

References 94 publications

Facile Synthesis and Characterization of Novel Carbon Nanofiber-Doped MWO4 (M–Mn, Co, Ni, Mn–Co, Mn–Ni, Ni–Co)-Based Nanostructured Electrode Materials for Application in Electrochemical Supercapacitors and Photoelectrochemical Water Splitting

Facile Synthesis and Characterization of Novel Carbon Nanofiber-Doped MWO4 (M–Mn, Co, Ni, Mn–Co, Mn–Ni, Ni–Co)-Based Nanostructured Electrode Materials for Application in Electrochemical Supercapacitors and Photoelectrochemical Water Splitting

Graphdiyne (CnH2n−2)/NiWO4 self-assembled p–n junction characterized with in situ XPS for efficient photocatalytic hydrogen production

Pt Nanoparticles Supported on Iron and Nitrogen-Doped Holey Graphene for Boosting ORR Performance

Contact Info

Product

Resources

About

Facile Synthesis and Characterization of Novel Carbon Nanofiber-Doped MWO₄ (M–Mn, Co, Ni, Mn–Co, Mn–Ni, Ni–Co)-Based Nanostructured Electrode Materials for Application in Electrochemical Supercapacitors and Photoelectrochemical Water Splitting

Facile Synthesis and Characterization of Novel Carbon Nanofiber-Doped MWO₄ (M–Mn, Co, Ni, Mn–Co, Mn–Ni, Ni–Co)-Based Nanostructured Electrode Materials for Application in Electrochemical Supercapacitors and Photoelectrochemical Water Splitting

Graphdiyne (C_nH_2n−2)/NiWO₄ self-assembled p–n junction characterized with in situ XPS for efficient photocatalytic hydrogen production