Cobalt-modified palladium nanocatalyst on nitrogen-doped reduced graphene oxide for direct hydrazine fuel cell

Hosseini, Mir Ghasem; Daneshvari-Esfahlan, Vahid; Wolf, Sigrid; Hacker, Viktor

doi:10.1039/d1ra07099a

Cited by 6 publications

(5 citation statements)

References 78 publications

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“…24 The XRD pattern of Pd/rGO (Figure 2b) contains several well-pronounced signals at 39.52°, 45.48°, and 67.02°2θ corresponding, respectively, to (111), (200), and (220) planes of metallic Pd. 49,50 This observation is supported by the electron microscopy data. The formation of nanoparticles is clearly visible in the HAADF-STEM images (Figure 3e).…”

Section: Monometallic Ni/rgo and Pd/rgo Compositessupporting

confidence: 66%

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Ni–Pd Nanocomposites on Reduced Graphene Oxide Support as Electrocatalysts for Hydrogen Evolution Reactions

Prytkova,

Kirsanova,

Kiiamov

et al. 2023

ACS Appl. Nano Mater.

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Synthesis of bimetallic nanoparticles is a popular approach in developing novel electrocatalytic materials. In this work, by wet chemical protocols, we synthesized the mixed nickel–palladium nanocomposite on reduced graphene oxide support (Ni–Pd/rGO) alone with its monometallic analogues Ni/rGO and Pd/rGO as reference samples. The structure of the three nanocomposites was revealed by a set of advanced instrumental methods. In Ni/rGO, nickel evenly covers the rGO support in the form of single ions, chemically bound to the surface. In Pd/rGO, palladium is in form of nanoparticles with the size of 3–8 nm. In Ni–Pd/rGO, nickel uniformly covers the rGO surface, and Pd forms nanoparticles, similar to that in the monometallic analogues. At the same time, a thin surface layer of the Pd nanoparticles is enriched by Ni atoms. The nickel-enriched layer is not continuous, with a gradient of Ni content from the particle surface toward its center; its thickness does not exceed dimensions of two to three atomic layers. Only Pd/rGO and Ni–Pd/rGO demonstrated catalytic activity toward the hydrogen evolution reaction (HER), suggesting that catalytic properties stem from Pd, not Ni. Ni–Pd/rGO exhibits a significantly higher electrocatalytic surface area of 2.421 m2/g, compared to 0.278 m2/g for Pd/rGO, which could be explained by agglomeration of Pd nanoparticles in the latter and their lower availability to reagents. Both nanocomposites demonstrated good stability after 1000 cycles. Despite reduced palladium content, Ni–Pd/rGO demonstrated higher efficiency toward HER with overpotential of 63 mV compared to 116 mV for Pd/rGO: the catalytic efficiency is increased simultaneously with reducing the content of precious Pd by half. These observations can be explained by the alteration of the surface energy of the particles due to the difference in electronegativity and the lattice mismatch between the two metals.

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Section: Monometallic Ni/rgo and Pd/rgo Compositessupporting

confidence: 66%

“…Other reflexes of metallic Pd (200), (220), and (311) are situated at 44.97°, 66.06°, and 82.99°2θ, respectively. 49,50 There are no reflexes corresponding to PdO in the XRD pattern. The reflex at 60.5°2θ can be assigned to the (012) plane of metallic Ni.…”

Section: Monometallic Ni/rgo and Pd/rgo Compositesmentioning

confidence: 99%

Ni–Pd Nanocomposites on Reduced Graphene Oxide Support as Electrocatalysts for Hydrogen Evolution Reactions

Prytkova,

Kirsanova,

Kiiamov

et al. 2023

ACS Appl. Nano Mater.

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“…Thus, low-temperature fuel cells that work with hydrazine, either in acid or basic media, represent an outstanding technology for the use of new, unconventional energy sources as fuel [203][204][205]. In this sense, several investigations are being carried out to achieve improvements in the catalytic electrooxidation of hydrazine to be used in direct hydrazine fuel cells (DHFC) [206][207][208][209][210][211][212][213][214][215][216][217][218][219][220][221][222][223].…”

Section: Green Hydrazine As a Fuelmentioning

confidence: 99%

“…Energies 2023, 16, x FOR PEER REVIEW 17 of 36 catalytic electrooxidation of hydrazine to be used in direct hydrazine fuel cells (DHFC) [206][207][208][209][210][211][212][213][214][215][216][217][218][219][220][221][222][223].…”

Section: Green Hydrazine As a Fuelmentioning

confidence: 99%

Current Research on Green Ammonia (NH3) as a Potential Vector Energy for Power Storage and Engine Fuels: A Review

et al. 2023

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Considering the renewable electricity production using sustainable technologies, such as solar photovoltaics or wind turbines, it is essential to have systems that allow for storing the energy produced during the periods of lower consumption as well as the energy transportation through the distribution network. Despite hydrogen being considered a good candidate, it presents several problems related to its extremely low density, which requires the use of very high pressures to store it. In addition, its energy density in volumetric terms is still clearly lower than that of most liquid fuels. These facts have led to the consideration of ammonia as an alternative compound for energy storage or as a carrier. In this sense, this review deals with the evaluation of using green ammonia for different energetic purposes, such as an energy carrier vector, an electricity generator and E-fuel. In addition, this study has addressed the latest studies that propose the use of nitrogen-derived compounds, i.e., urea, hydrazine, ammonium nitrate, etc., as alternative fuels. In this study, the possibility of using other nitrogen-derived compounds, i.e., an update of the ecosystem surrounding green ammonia, has been assessed, from production to consumption, including storage, transportation, etc. Additionally, the future challenges in achieving a technical and economically viable energy transition have been determined.

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“…An appropriate support material accelerate the charge transfer kinetics in the catalyst due to its high electrical conductivity. 17,18 Carbon-based nanomaterials have been widely used as effective supports material for nanoparticles dispersion. [19][20][21] Among all carbon-based materials, graphene is the most widely used due to its extraordinary properties.…”

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confidence: 99%

Electrochemically Reduced Graphene Oxide Supported Palladium-Cobalt Alloy Nanoparticles as Highly Efficient Electrocatalyst for Oxygen Reduction Reaction

Yasmin,

Kabir,

Shaikh

et al. 2023

ECS J. Solid State Sci. Technol.

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Pd-Co alloy nanoparticles were synthesized on electrochemically reduced graphene oxide (ErGO) for electrocatalytic oxygen reduction reaction (ORR) in alkaline media. The morphological structure, chemical composition, and crystallinity of the afforded ErGO/Pd-Co catalyst were examined by various techniques, including transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction analysis. The Pd-Co alloy nanoparticles were evenly distributed on the ErGO sheet and had a narrow size distribution, with an average particle size of 4.25 nm. The ORR activity of the as-prepared ErGO/Pd-Co alloy catalyst was evaluated by cyclic voltammetry, linear sweep voltammetry, rotating disk electrode, and rotating ring disk electrode techniques in an alkaline electrolyte. The ErGO/Pd-Co catalyst exhibits a very high electrocatalytic activity in ORR with the mass activity more than 2.0 times of the commercial 20% Pt/C due to the synergistic catalytic effect of both ErGO and Pd-Co nanoparticles. Electrocatalytic kinetics investigation shows that, the ORR on the ErGO/Pd-Co catalyst proceeds through four electrons transferred mechanism with negligible amount of peroxide species. Moreover, the ErGO/Pd-Co shows an excellent methanol tolerance than the commercial 20% Pt/C.

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Cobalt-modified palladium nanocatalyst on nitrogen-doped reduced graphene oxide for direct hydrazine fuel cell

Abstract: The superior catalytic activity and stability of a novel anodic PdCo NPs/NrGO NSs for HzOR are confirmed by half and signal cell investigations.

Cited by 6 publications

References 78 publications

Ni–Pd Nanocomposites on Reduced Graphene Oxide Support as Electrocatalysts for Hydrogen Evolution Reactions

Ni–Pd Nanocomposites on Reduced Graphene Oxide Support as Electrocatalysts for Hydrogen Evolution Reactions

Current Research on Green Ammonia (NH3) as a Potential Vector Energy for Power Storage and Engine Fuels: A Review

Electrochemically Reduced Graphene Oxide Supported Palladium-Cobalt Alloy Nanoparticles as Highly Efficient Electrocatalyst for Oxygen Reduction Reaction

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