Kinetics of Platinum-Catalyzed Decomposition of Hydrogen Peroxide

Vetter, Tiffany A.; Colombo, D.

doi:10.1021/ed080p788

Cited by 25 publications

(18 citation statements)

References 10 publications

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“…In the presence of H 2 O 2 , metal Mg prefers to react with H 2 O 2 without H 2 production rather than with H 2 O because of the higher reduction potential of H 2 O 2 (0.878 V vs. SHE) than H 2 O (-0.83 V vs. SHE) [30]. Simultaneously, Pt-catalyzed H 2 O 2 decomposition has a much higher rate constant (about 3:60 × 10 −2 min −1 ) than Mg-H 2 O reaction (about 1:05 × 10 −2 min −1 ) at an approximate pH of 7 [39,40]. Additionally, the lower critical nucleation concentration of O 2 (68 mM) is much lower than that of H 2 (about 250 mM) bubbles [41,42].…”

Section: Resultsmentioning

confidence: 99%

Mg-Based Micromotors with Motion Responsive to Dual Stimuli

Xiong

Lin

et al. 2020

Research

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Mg-based micromotors have emerged as an extremely attractive artificial micro/nanodevice, but suffered from uncontrollable propulsion and limited motion lifetime, restricting the fulfillment of complex tasks. Here, we have demonstrated Mg-based micromotors composed of Mg microspheres asymmetrically coated with Pt and temperature-sensitive poly(N-isopropylacrylamide) (PNIPAM) hydrogel layers in sequence. They can implement different motion behaviors stemming from the driving mechanism transformation when encountering catalyzed substrates such as H2O2 and respond to both H2O2 concentration and temperature in aqueous environment. The as-constructed Mg-based micromotors are self-propelled by Pt-catalyzed H2O2 decomposition following the self-consuming Mg-H2O reaction. In this case, they could further generate bilateral bubbles and thus demonstrate unique self-limitation motion like hovering when the phase transformation of PNIPAM is triggered by decreasing temperature or when the H2O2 concentration after permeating across the PNIPAM hydrogel layer is high enough to facilitate bubble nucleation. Our work for the first time provides a stimuli-induced “hovering” strategy for self-propelled micromotors, which endows Mg-based micromotors with an intelligent response to the surroundings besides the significant extension of their motion lifetime.

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Section: Resultsmentioning

confidence: 99%

Mg-Based Micromotors with Motion Responsive to Dual Stimuli

Xiong

Lin

et al. 2020

Research

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“…When calculating the frequency, one has to consider the difference between buoyant and gravitational force as a function of time, Δ F b‐g ( t ), which is composed of a constant term Δ F b−g,0 corresponding to static gas bubble adsorption, and a time‐dependent, dynamic adsorption part arising from oxygen production, Δ F Ox (Equation ). This term should be linear in time as the production rate of oxygen ( k Ox ) followed first order kinetics of the catalytic decomposition of H 2 O 2 at the surface of Pt (Equation )

Δ F_{b - g} (t) = Δ F_{b - g, 0} + Δ F_{Ox} (t)

Δ F_{Ox} (t) = k_{Ox} t

…”

Section: Resultsmentioning

confidence: 99%

Active Steerable Catalytic Supraparticles Shuttling on Preprogrammed Vertical Trajectories

Sperling

Kim

Velev

et al. 2016

Adv Materials Inter

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This study presents a novel type of mm‐sized colloidal supraparticle performing self‐propelled oscillating motion that can be programmed on a controlled 3D trajectory. These supraparticles are self‐assembled inside drying aqueous colloidal suspension droplets on a superhydrophobic surface. The droplets contain silica microspheres as main colloidal building block and Pt‐covered Fe3O4 nanoparticles as catalyst. The supraparticles are rendered patchy by attracting the magnetic catalyst nanoparticles to one side of the droplet during the assembly. Catalytic decomposition of H2O2 leads to vertical motion by buoyancy of formed bubbles. This study comprehensively analyzes this motion in terms of the vertical oscillation frequency that depends on H2O2 “fuel” concentration as well as on the supraparticles density. It is demonstrated that the magnetic functionality can be used to manipulate the particle's trajectory to access nearly any place within the vessel. Furthermore, after binding of α‐amylase to the particle surface it is shown that their motion leads to rapid catalytic decomposition of a blue starch–iodine complex within the whole medium. Thus, these functional supraparticles can find versatile applications in a new generation of highly efficient catalysts, microstirrers and self‐motile microshuttles that can perform designed tasks while being able to access every point in the liquid in controlled trajectories.

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“…For both catalyst loadings, the amount of peroxide formed is significantly lower for the Pd-based catalyst than for the commercial Pt catalyst at potentials lower than 0.7 V vs. SHE. Both Pt and Pd not only produce H 2 O 2 during oxygen reduction (23,28), but are also active catalysts for hydrogen peroxide decomposition (29)(30)(31)(32). Vetter et al measured decomposition rates with Pt catalysts at various temperatures and determined the first order decomposition rate constant at 20-30 °C in pH 7 solution to be 3.6 x 10 -4 s -1 (29).…”

Section: Ecs Transactionsmentioning

confidence: 99%

“…Both Pt and Pd not only produce H 2 O 2 during oxygen reduction (23,28), but are also active catalysts for hydrogen peroxide decomposition (29)(30)(31)(32). Vetter et al measured decomposition rates with Pt catalysts at various temperatures and determined the first order decomposition rate constant at 20-30 °C in pH 7 solution to be 3.6 x 10 -4 s -1 (29). By comparison, values for Pd catalysts are up to thirty times larger and range from 1 x 10 -3 to 10 x 10 -3 s -1 in pH 2 -7 solutions (30)(31)(32).…”

Section: Ecs Transactionsmentioning

confidence: 99%

Electrochemical Characterization of Various Carbon-Supported Pt-Pd Bimetallic Electrocatalysts Prepared by Electroless Deposition

2010

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Various Pt-Pd/C bimetallic compositions have been prepared by electroless deposition (ED) methods. The morphology has been identified as Pd cores partially encapsulated by Pt shells by various spectroscopic techniques. No monometallic Pt or Pd particles have been detected. The ratio of Pt to Pd was also well controlled. Although the electrochemical activity of the Pt-Pd/C catalyst for oxygen reduction reaction (ORR) was equal to or less than that for commercially available Pt/C catalysts, the amount of hydrogen peroxide detected as ring current was reduced by the exposed Pd component, suggesting that such a catalyst has the potential to decrease ionomer degradation in certain applications. The Pt on Pd/C catalysts also show much higher resistance to agglomeration induced by potential cycling. Analysis by high resolution scanning transmission electron microscopy following potential cycling reveals no changes in both particle sizes and electrochemical active areas.

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Kinetics of Platinum-Catalyzed Decomposition of Hydrogen Peroxide

Cited by 25 publications

References 10 publications

Mg-Based Micromotors with Motion Responsive to Dual Stimuli

Mg-Based Micromotors with Motion Responsive to Dual Stimuli

Active Steerable Catalytic Supraparticles Shuttling on Preprogrammed Vertical Trajectories

Electrochemical Characterization of Various Carbon-Supported Pt-Pd Bimetallic Electrocatalysts Prepared by Electroless Deposition

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