Control of the metal-support interactions in Ru on N-doped graphene-encapsulated Ni nanoparticles to promote their hydrogen evolution reaction catalytic performance

Yuan, Ying; Rong, Junfeng; Zheng, Lufan; Hu, Zheng; Hu, Shengsun; Wu, Chongchong; Zhuang, Zhongbin

doi:10.1016/j.ijhydene.2023.06.124

Cited by 12 publications

(2 citation statements)

References 39 publications

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“…Sorption at the level of 6-9 wt.% (or even higher) was unfortunately achieved only for computational models or was connected to highly troublesome aspects (like partial decomposition during hydrogen release [8], leading to hydrogen contamination with volatile hydrocarbons [9] in the case of fullerenes). Research has focused on the possibility of using the spillover phenomenon, especially with a palladium or platinum catalyst [10][11][12] and spatial graphene based on a crosslinking structure or by incorporating particles [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Spatial Graphene Structures with Potential for Hydrogen Storage

Jastrzębski,

Cłapa,

Kaczmarek

et al. 2024

Energies

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Spatial graphene is a 3D structure of a 2D material that preserves its main features. Its production can be originated from the water solution of graphene oxide (GO). The main steps of the method include the crosslinking of flakes of graphene via treatment with hydrazine, followed by the reduction of the pillared graphene oxide (pGO) with hydrogen overpressure at 700 °C, and further decoration with catalytic metal (palladium). Experimental research achieved the formation of reduced pillared graphene oxide (r:pGO), a porous material with a surface area equal to 340 m2/g. The transition from pGO to r:pGO was associated with a 10-fold increase in pore volume and the further reduction of remaining oxides after the action of hydrazine. The open porosity of this material seems ideal for potential applications in the energy industry (for hydrogen storage, in batteries, or in electrochemical and catalytic processes). The hydrogen sorption potential of the spatial graphene-based material decorated with 6 wt.% of palladium reached 0.36 wt.%, over 10 times more than that of pure metal. The potential of this material for industrial use requires further refining of the elaborated procedure, especially concerning the parameters of substrate materials.

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Section: Introductionmentioning

confidence: 99%

Spatial Graphene Structures with Potential for Hydrogen Storage

Jastrzębski,

Cłapa,

Kaczmarek

et al. 2024

Energies

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“…To improve the conductivity of transition metal-based catalysts and expose more active sites, the most promising strategies are as follows: (1) Introducing new compounds to synthesize polymetallic compounds and use their synergistic effects to tune electronic structures [ 25 ]; (2) constructing porous structures, increasing their surface area, and exposing more active sites [ 26 ]; (3) introducing a conductive substrate to improve the charge transfer ability of the catalyst [ 23 ], such as carbon nanotubes [ 27 , 28 ] and graphene [ 29 , 30 , 31 ]. Graphene as a layered nanomaterial can be further introduced to construct a hierarchical structure via its self-assembly of functionalized nanosheets, which can accelerate ion diffusion and charge transfer and improve the conductivity of compounds [ 32 ]. The strong coupling of hierarchical graphene with transition metal fluorides not only provides abundant channels but also inhibits the aggregation and stacking of transition metals, exposing more active sites to realize an enhancement in the catalytic performance [ 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Graphene Architecture-Supported Porous Cobalt–Iron Fluoride Nanosheets for Promoting the Oxygen Evolution Reaction

Lu,

Han,

Zhang

et al. 2023

Nanomaterials

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The design of efficient oxygen evolution reaction (OER) electrocatalysts is of great significance for improving the energy efficiency of water electrolysis for hydrogen production. In this work, low-temperature fluorination and the introduction of a conductive substrate strategy greatly improve the OER performance in alkaline solutions. Cobalt–iron fluoride nanosheets supported on reduced graphene architectures are constructed by a one-step solvothermal method and further low-temperature fluorination treatment. The conductive graphene architectures can increase the conductivity of catalysts, and the transition metal ions act as electron acceptors to reduce the Fermi level of graphene, resulting in a low OER overpotential. The surface of the catalyst becomes porous and rough after fluorination, which can expose more active sites and improve the OER performance. Finally, the catalyst exhibits excellent catalytic performance in 1 M KOH, and the overpotential is 245 mV with a Tafel slope of 90 mV dec−1, which is better than the commercially available IrO2 catalyst. The good stability of the catalyst is confirmed with a chronoamperometry (CA) test and the change in surface chemistry is elucidated by comparing the XPS before and after the CA test. This work provides a new strategy to construct transition metal fluoride-based materials for boosted OER catalysts.

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In Situ Engineering Multifunctional Active Sites of Ruthenium–Nickel Alloys for pH‐Universal Ampere‐Level Current‐Density Hydrogen Evolution

Liu,

Shi,

Dai

et al. 2024

Small

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Developing robust non‐platinum electrocatalysts with multifunctional active sites for pH‐universal hydrogen evolution reaction (HER) is crucial for scalable hydrogen production through electrochemical water splitting. Here ultra‐small ruthenium‐nickel alloy nanoparticles steadily anchored on reduced graphene oxide papers (Ru‐Ni/rGOPs) as versatile electrocatalytic materials for acidic and alkaline HER are reported. These Ru–Ni alloy nanoparticles serve as pH self‐adaptive electroactive species by making use of in situ surface reconstruction, where surface Ni atoms are hydroxylated to produce bifunctional active sites of Ru‐Ni(OH)2 for alkaline HER, and selectively etched to form monometallic Ru active sites for acidic HER, respectively. Owing to the presence of Ru‐Ni(OH)2 multi‐site surface, which not only accelerates water dissociation to generate reactive hydrogen intermediates but also facilitates their recombination into hydrogen molecules, the self‐supported Ru90Ni10/rGOP hybrid electrode only takes overpotential of as low as ≈106 mV to deliver current density of 1000 mA cm−2, and maintains exceptional stability for over 1000 h in 1 m KOH. While in 0.5 m H2SO4, the Ru90Ni10/rGOP hybrid electrode exhibits acidic HER catalytic behavior comparable to commercially available Pt/C catalyst due to the formation of monometallic Ru shell. These electrochemical behaviors outperform some of the best Ru‐based catalysts and make it attractive alternative to Pt‐based catalysts toward highly efficient HER.

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Control of the metal-support interactions in Ru on N-doped graphene-encapsulated Ni nanoparticles to promote their hydrogen evolution reaction catalytic performance

Cited by 12 publications

References 39 publications

Spatial Graphene Structures with Potential for Hydrogen Storage

Spatial Graphene Structures with Potential for Hydrogen Storage

Graphene Architecture-Supported Porous Cobalt–Iron Fluoride Nanosheets for Promoting the Oxygen Evolution Reaction

In Situ Engineering Multifunctional Active Sites of Ruthenium–Nickel Alloys for pH‐Universal Ampere‐Level Current‐Density Hydrogen Evolution

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