Ammonia adsorption and decomposition on a Ni(110) surface

Grunze, M.; Golze, Manfred; Driscoll, R.K.; Dowben, Peter A.

doi:10.1116/1.570833

Cited by 90 publications

(30 citation statements)

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“…8c indicates a higher catalytic activity for NH 3 decomposition on edge sites than on terraces. This result is consistent with previously reported structure sensitivity for NH 3 decomposition with catalysts based on Ni [26,27] or K-promoted Fe [7] and with the well-established surface sensitivity for the NH 3 synthesis reaction [28,29]. For NH 3 synthesis, N 2 dissociation is the rate limiting step, and the rate of the dissociative adsorption of N 2 on Ru has been shown to be a least 9 orders of magnitude higher on steps than on terraces [30].…”

Section: The Active Phasesupporting

confidence: 92%

Alloyed Ni-Fe nanoparticles as catalysts for NH3 decomposition

Simonsen

Chakraborty²,

Chorkendorff

et al. 2012

Applied Catalysis A: General

100

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Section: The Active Phasesupporting

confidence: 92%

Alloyed Ni-Fe nanoparticles as catalysts for NH3 decomposition

Simonsen

Chakraborty²,

Chorkendorff

et al. 2012

Applied Catalysis A: General

100

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“…Ammonia adsorption kinetics on Ni( 110) also display a constant uptake rate until close to saturation coverage. 21 This behavior is consistent with a highly mobile precursor that is able to diffuse on the surface and find available adsorption sites. 33…”

Section: B Adsorption Kineticssupporting

confidence: 65%

Adsorption, desorption, and surface diffusion kinetics of NH3 on MgO(100)

Arthur

Meixner

Boudart

et al. 1991

The Journal of Chemical Physics

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Laser-induced thermal desorption (LITD) techniques were used to study the adsorption, desorption, and surface diffusion kinetics of NH3 on MgO ( 100) single-crystal surfaces. Isothermal LITD adsorption measurements revealed that the sticking coefficient of NH3 on MgO ( 100) was constant vs coverage and decreased with increasing surface temperature. The adsorption kinetics were consistent with a mobile precursor intermediate. In addition, the saturation NH3 coverage on MgO ( 100) was strongly dependent on temperature, and decreased by a factor of 5 as temperature increased from 130 to 165 K. Isothermal and linear temperature ramp LITD experiments indicated that the desorption kinetics of NH3 from MgO( 100) could be modeled using a first-order rate law with a coverage-dependent desorption activation energy. The coverage dependence of the desorption activation energy was consistent with repulsive lateral interactions between NH3 adsorbates on the MgO( 100) surface. The surface diffusion ofNH 3 on MgO( 100) was also examined using LITD techniques. In contrast to recent predictions of NH3 surface diffusion on MgO ( 100), no evidence of NH3 surface mobility (D<1O-9 cm 2 /s) was observed for temperatures as high as 165 K.

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“…We believe these to be decomposition products (D) of MAI, e.g. methylamine H 3 C-NH 2 or ammonia NH 3 43. Surprisingly, on ITO nitrogen is hardly observed at all.…”

Section: Resultsmentioning

confidence: 86%

Substrate-dependent electronic structure and film formation of MAPbI3 perovskites

Olthof

Meerholz

2017

Sci Rep

257

326

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We present investigations on the interface formation between the hybrid perovskite MAPbI3 and various substrates, covering a wide range of work functions. The perovskite films are incrementally evaporated in situ while the electronic structure is evaluated using photoelectron spectroscopy. Our results show that there is an induction period in the growth of the perovskite during which volatile compounds are formed, catalyzed by the substrate. The duration of the induction period depends strongly on the nature of the substrate material, and it can take up to 20–30 nm of formal precursor deposition before the surface is passivated and the perovskite film starts forming. The stoichiometry of the 2–3 nm thin passivation layer deviates from the expected perovskite stoichiometry, being rich in decomposition products of the organic cation. During the regular growth of the perovskite, our measurements show a deviation from the commonly assumed flat band condition, i.e., dipole formation and band bending dominate the interface. Overall, the nature of the substrate not only changes the energetic alignment of the perovskite, it can introduce gap states and influence the film formation and morphology. The possible impact on device performance is discussed.

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Ammonia adsorption and decomposition on a Ni(110) surface

Cited by 90 publications

References 0 publications

Alloyed Ni-Fe nanoparticles as catalysts for NH3 decomposition

Alloyed Ni-Fe nanoparticles as catalysts for NH3 decomposition

Adsorption, desorption, and surface diffusion kinetics of NH3 on MgO(100)

Substrate-dependent electronic structure and film formation of MAPbI3 perovskites

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