Outstanding hydrogen evolution performance of supported Pt nanoparticles: Incorporation of preformed colloids into mesoporous carbon films

Bernsmeier, Denis; Sachse, René; Bernicke, Michael; Schmack, Roman; Kettemann, Frieder; Polte, Jörg; Kraehnert, Ralph

doi:10.1016/j.jcat.2018.11.006

Cited by 39 publications

(29 citation statements)

References 71 publications

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“…The electrochemical HER performances of Ru-SA-NSFC, Ir-SA-NSFC, and Pt-SA-NSFC were also studied. The overpotentials at a current density of 10 mA cm −2 of Ru-SA-NSFC, Ir-SA-NSFC, and Pt-SA-NSFC were 62, 67 and 45 mV, respectively, implying comparable HER activities with reported noble metal-based electrocatalysts (Supplementary Table 12) [57][58][59][60][61][62] .…”

Section: Resultsmentioning

confidence: 70%

Multilayer stabilization for fabricating high-loading single-atom catalysts

et al. 2020

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Metal single-atom catalysts (M-SACs) have emerged as an attractive concept for promoting heterogeneous reactions, but the synthesis of high-loading M-SACs remains a challenge. Here, we report a multilayer stabilization strategy for constructing M-SACs in nitrogen-, sulfur- and fluorine-co-doped graphitized carbons (M = Fe, Co, Ru, Ir and Pt). Metal precursors are embedded into perfluorotetradecanoic acid multilayers and are further coated with polypyrrole prior to pyrolysis. Aggregation of the metals is thus efficiently inhibited to achieve M-SACs with a high metal loading (~16 wt%). Fe-SAC serves as an efficient oxygen reduction catalyst with half-wave potentials of 0.91 and 0.82 V (versus reversible hydrogen electrode) in alkaline and acid solutions, respectively. Moreover, as an air electrode in zinc–air batteries, Fe-SAC demonstrates a large peak power density of 247.7 mW cm−2 and superior long-term stability. Our versatile method paves an effective way to develop high-loading M-SACs for various applications.

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Section: Resultsmentioning

confidence: 70%

Multilayer stabilization for fabricating high-loading single-atom catalysts

et al. 2020

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“…The size of Pt nanoparticles changed from (2.1 ± 0.5) nm before the synthesis to (3.0 ± 1.0) nm in the final composite, and no Pt was trapped in pore walls or micropores. Such prepared catalysts reached two times higher current densities, compared to the commercial Pt/C [55]. A similar approach was employed with ruthenium nanoparticles by Creus et al [56].…”

Section: Supported Metallic Nanoparticlesmentioning

confidence: 85%

Hydrogen Evolution Reaction-From Single Crystal to Single Atom Catalysts

et al. 2020

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Hydrogen evolution reaction (HER) is one of the most important reactions in electrochemistry. This is not only because it is the simplest way to produce high purity hydrogen and the fact that it is the side reaction in many other technologies. HER actually shaped current electrochemistry because it was in focus of active research for so many years (and it still is). The number of catalysts investigated for HER is immense, and it is not possible to overview them all. In fact, it seems that the complexity of the field overcomes the complexity of HER. The aim of this review is to point out some of the latest developments in HER catalysis, current directions and some of the missing links between a single crystal, nanosized supported catalysts and recently emerging, single-atom catalysts for HER.

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“…The size of Pt nanoparticles changed from (2.1±0.5) nm before the synthesis to (3.0±1.0) nm in the final composite, and no Pt was trapped in pore walls or micropores. Such prepared catalysts reached two times higher current densities, compared to the commercial Pt/C [46]. A similar approach was employed with ruthenium nanoparticles by Creus et al [47].…”

Section: Supported Metallic Nanoparticlesmentioning

confidence: 85%

Hydrogen Evolution Reaction - From Single Crystal to Single Atom Catalysts

Gutić¹,

Dobrota²,

Fako³

et al. 2020

Preprint

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Hydrogen evolution reaction (HER) is one of the most important reaction in electrochemistry. This is not only because it is the simplest way to produce high purity hydrogen and the fact that it is the side reaction in many other technologies. HER actually shaped current electrochemistry because it was in focus of active research for so many years (and it still is). The number of catalysts investigated for HER is immense, and it is impossible to overview them all. In fact, it seems that the complexity of the field overcomes the complexity of HER. The aim of this review is to point out some of the latest developments in HER catalysis, current directions and some of the missing links between a single crystal, nanosized supported catalysts and, recently emerging, single atom catalysts for HER.3 of 36 HER at single crystal surfaces and bulk surfacesA crystalline solid can be considered as a series of mutually parallel lattice planes, arranged in a periodic way. Close to the surface, the spatial arrangement of the lattice planes, their crystallographic structure, as well as the dynamics of the constituent atoms may differ from the corresponding features in the bulk [1]. Most clean metals show the tendency to minimize their surface energy. One of the mechanisms is relaxation, the shift of one or more lattice planes located near to the surface, usually perpendicularly to the surface, so that the interlayer distance changes compared to the bulk lattice. The other one is reconstruction -change in equilibrium positions and bonding of surface atoms so that the projection of bulk unit cell to the given surface does not correspond to the surface unit cell. Different crystallographic planes (with different Miller indices) of the same metal exhibit unequal surface densities (number of atoms per surface area), and therefore undergo surface relaxation/reconstruction to different extents [2]. For example, Pt(100) has lower surface density compared to densely packed Pt(111) and therefore has a stronger tendency to relax/reconstruct. Since the main driving force for the mentioned surface modifications is the low coordination number (non-saturation) of surface atoms, it is obvious that atom/molecule adsorption on clean metal surfaces can have a significant effect on its surface structure, inducing relaxation/reconstruction changes. This is of huge importance for HER, as it involves adsorbed atomic hydrogen (Hads) as an intermediate. Additionally, in an electrochemical system, the electrode will be modified by adsorption of "spectator" species (ions/molecules from the electrolyte), so HER will not be taking place on clean metal surfaces, but rather on modified ones. Obviously, there is a complex dynamic interplay between the catalyst surface, reactants, intermediates, and electrolyte.According to the Sabatier principle, the interaction of the reaction reactants/intermediates with the catalyst has to be optimal in strength. If it is too weak, the reactants will not bind to the catalyst and the reaction will not be able to take place. In...

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Outstanding hydrogen evolution performance of supported Pt nanoparticles: Incorporation of preformed colloids into mesoporous carbon films

Cited by 39 publications

References 71 publications

Multilayer stabilization for fabricating high-loading single-atom catalysts

Multilayer stabilization for fabricating high-loading single-atom catalysts

Hydrogen Evolution Reaction-From Single Crystal to Single Atom Catalysts

Hydrogen Evolution Reaction - From Single Crystal to Single Atom Catalysts

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