Electrocatalytic Investigation of M@Pd (M=Ni, Co, Cu) Core‐Shell Nanostructure Supported on N, S‐Doped Reduced Graphene Oxide towards Hydrogen and Oxygen Evolution Reaction

Woldetinsay, Mengistu; Femi, Olu Emmanuel; Soreta, Tesfaye Refera; Maiyalagan, T.

doi:10.1002/slct.202002200

Cited by 9 publications

(9 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pd-ECs/GS 2 presented satisfactory HER performance, the η at 10 mA cm –2 was 80 mV, and the peak current density was 270 mA cm –2 at 400 mV. From the literature, it is also obvious that Pd-based materials have a high binding energy for hydrogen and ultimately present poor HER activity. , Binding energy can be modulated by making alloys with some other metals . Therefore, in our study, alloying Pd with cost-effective and intrinsically electroactive Ni metal can facilely modulate the overall electronic structure of the newly formed alloy.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, it is well-known that metal alloys with a large number of unpaired d-band electrons can donate electrons and adsorb hydrogen atoms effectively, which is beneficial for electrocatalytic hydrogen evolution . Recently, researchers developed M@Pd core–shell nanostructures by a hydrothermal approach as a bifunctional catalyst for OER and HER processes. , Ni is a potential candidate among transition metals as Ni-based catalysts are the most promising catalysts for HER owing to their low cost and good catalytic activity. ,, Making an alloy of Pd with Ni and other low-cost transition metals not only modifies the binding energy of participating metals in a newly formed alloy but also reduces the overall cost of the electrocatalyst and makes it more industrially compatible …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electrocatalytic Investigations into a PdNi Nanostructured Alloy Supported over a Graphite Sheet toward Pt-like Hydrogen Evolution Activity

et al. 2022

View full text Add to dashboard Cite

Hydrogen desorption applications over Pd are strongly hindered due to the strong affinity of Pd metal for hydrogen, and thus, exploring Pd-centered hydrogen evolution reaction (HER) catalysts in place of Pt-based materials remains a challenge. Bimetallic alloying could modify the binding energy of metals at the alloy surface for optimum adsorption/desorption of reaction intermediates and an ultimately fast rate of the HER process. Here, a series of PdNi alloy film electrodes of varying thickness was prepared on a graphite substrate by directing the deposition time following a single-step aerosol-assisted chemical vapor deposition method. The structure and morphology of the deposited alloy films were characterized using X-ray, spectroscopic, and microscopy-based techniques. The results confirm the formation of a highly pure PdNi alloyed nanostructure. The electrocatalytic efficiency of the developed films was tested by monitoring the hydrogen evolution reaction under acidic conditions. The PdNi alloy film obtained after a 2 h deposition time demonstrated the best catalytic activity with an overpotential of only 20 mV at a current density of 10 mA cm–2 and a Tafel value of 50.2 mV/dec, a small charge transfer resistance of just 1.2 Ω, and a high turnover frequency and J exc of 0.83 s–1@0.2 V and 10.69 mA cm–2, respectively. The developed electrodes also demonstrated good chemical and mechanical stability for 22 h in a durability test operating at 100 and 200 mA cm–2. The results are comparable to the state-of-the-art Pt-based HER catalyst investigated under similar circumstances. The remarkably increased electroactive sites on the bimetallic alloy with reasonable binding energies and synergistic interactions between the nanostructured PdNi alloy and the graphite support could cumulatively enhance the electrochemical activity for HER under employed conditions.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrocatalytic Investigations into a PdNi Nanostructured Alloy Supported over a Graphite Sheet toward Pt-like Hydrogen Evolution Activity

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Combining N, S-rGO, and CeO 2 may optimize both the dispersion and catalytic activity of Pd nanoparticles and stability. Recently, we reported M@Pd(M=Ni, Cu, Co) core-shell nanostructures supported on N, S-rGO [43] and Pd/MOS 2 /N, S-rGO [44] to demonstrate a higher electrocatalytic activity with small overpotential, stability, and lower Tafel slope value towards hydrogen evolution reactions due to the synergetic effect between Pd nanoparticles and supports.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Electrocatalytic study of Pd supported on CeO2 doped on N, S-rGO towards Hydrogen and Oxygen Evolution

Woldetinsay¹,

Soreta²,

Palani³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

The sustainable production of hydrogen and oxygen through electrolysis of water requires the development of an efficient electrocatalyst. Herein, we synthesized Pd nanoparticles dispersed on CeO2/N, S-rGO by hydrothermal method followed by chemical reduction of Pd nanoparticles. Electrochemical measurements towards hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) show a high electrocatalytic activity of the catalyst. Among the synthesized electrocatalysts Pd/CeO2/N, S-rGO exhibits lower overpotential (75 mV and 240 mV) at 10 mAcm− 2 and lower Tafel slope value (44 mV dec− 1 and 42 mV dec− 1) for HER and OER, respectively. The chronoamperometric and linear sweep voltammetry (LSV) of the electrocatalyst shows a negligible decrease in the current density for twelve hours and a minor change in the polarization curve after 10,000 cycles, respectively. The high electrocatalytic activity and superior stability of the synthesized electrocatalyst could be attributed to the synergetic effect between Pd nanoparticles and CeO2/N, S-rGO support. This work demonstrates a facile way to develop effective and stable electrocatalysts by exploiting the Pd/Metal oxide interface.

show abstract

“…In this respect, reduced graphene oxide (rGO) is the best choice due to its high surface area, good conductivity, and thermal and chemical stability [41,42]. Combining N, S-rGO, and CeO 2 may optimize both the dispersion and catalytic activity of Pd nanoparticles and stability.Recently, we reported M@Pd(M=Ni, Cu, Co) core-shell nanostructures supported on N, S-rGO [43] and Pd/MOS 2 /N, S-rGO [44] to demonstrate a higher electrocatalytic activity with small overpotential, stability, and lower Tafel slope value towards hydrogen evolution reactions due to the synergetic effect between Pd nanoparticles and supports.…”

mentioning

confidence: 99%

“…Recently, we reported M@Pd(M=Ni, Cu, Co) core-shell nanostructures supported on N, S-rGO [43] and Pd/MOS 2 /N, S-rGO [44] to demonstrate a higher electrocatalytic activity with small overpotential, stability, and lower Tafel slope value towards hydrogen evolution reactions due to the synergetic effect between Pd nanoparticles and supports.…”

mentioning

confidence: 99%

Synthesis, characterization and electrocatalytic study of Pd supported on CeO2–N, S-rGO composite towards hydrogen and oxygen evolution reaction

Woldetinsay

Soreta

Palani

et al. 2021

J Mater Sci: Mater Electron

Self Cite

View full text Add to dashboard Cite

The sustainable production of hydrogen and oxygen through electrolysis of water requires the development of an e cient electrocatalyst. Herein, we synthesized Pd nanoparticles dispersed on CeO 2 /N, S-rGO by hydrothermal method followed by chemical reduction of Pd nanoparticles.Electrochemical measurements towards hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) show a high electrocatalytic activity of the catalyst. Among the synthesized electrocatalysts Pd/CeO 2 /N, S-rGO exhibits lower overpotential (75 mV and 240 mV) at 10 mAcm − 2 and lower Tafel slope value (44 mV dec − 1 and 42 mV dec − 1 ) for HER and OER, respectively. The chronoamperometric and linear sweep voltammetry (LSV) of the electrocatalyst shows a negligible decrease in the current density for twelve hours and a minor change in the polarization curve after 10,000 cycles, respectively. The high electrocatalytic activity and superior stability of the synthesized electrocatalyst could be attributed to the synergetic effect between Pd nanoparticles and CeO 2 /N, S-rGO support. This work demonstrates a facile way to develop effective and stable electrocatalysts by exploiting the Pd/Metal oxide interface.An additional reason for the special attention given to Pd based materials towards hydrogen evolution reaction is because of its fast adsorption kinetics, selectivity, and reversible hydrogen formation [20].However, the desorption of hydrogen from the palladium catalyst surface is very di cult. The hydrogen evolution performance of Pd nanoparticle can be improved by modifying the electronic properties and crystal parameters, which could be achieved by reducing Pd's size.The noble metal content in the electrocatalyst can be reduced without compromising the HER performance using support materials with a higher surface area and good electrical conductivity [21].Good electrical conductivity, higher surface area, optimum porosity, and higher stability in an acidic environment are the main characteristics of good support material. They should also possess high energy density and corrosion resistance under oxidizing conditions [22,23].The morphology, size, structure, and nature of the support materials may in uence the metal nanoparticles' catalytic activity. In addition to these, the low coordination of metal nanoparticles, quantum size effect, and better metal support interactions could have a more signi cant impact [24] Among the carbon support materials, graphene can best t the above criteria [25,26]. However, due to the Van der Waals attraction between graphene nanosheets, the effective surface area and conductivity could be affected [27,28]. To solve this problem, doping of electron-rich specious on graphene is the best option to help the carbon π electrons conjugate with an electron of doped element and increase the material's donor properties [29].Generally, various carbon-supported catalysts have signi cant limitations, such as low electrocatalytic stability due to the rapid depletion of carbon [30]. Many attempts have been devot...

show abstract

Electrocatalytic Investigation of M@Pd (M=Ni, Co, Cu) Core‐Shell Nanostructure Supported on N, S‐Doped Reduced Graphene Oxide towards Hydrogen and Oxygen Evolution Reaction

Cited by 9 publications

References 49 publications

Electrocatalytic Investigations into a PdNi Nanostructured Alloy Supported over a Graphite Sheet toward Pt-like Hydrogen Evolution Activity

Electrocatalytic Investigations into a PdNi Nanostructured Alloy Supported over a Graphite Sheet toward Pt-like Hydrogen Evolution Activity

Synthesis, Characterization and Electrocatalytic study of Pd supported on CeO2 doped on N, S-rGO towards Hydrogen and Oxygen Evolution

Synthesis, characterization and electrocatalytic study of Pd supported on CeO2–N, S-rGO composite towards hydrogen and oxygen evolution reaction

Contact Info

Product

Resources

About