pH effect on oxygen reduction reaction at Pt(111) electrode

Li, Ming Fang; Liao, Ling Wen; Yuan, Dao-Fu; Dong, Mei; Chen, Yan‐Xia

doi:10.1016/j.electacta.2013.04.096

Cited by 128 publications

(130 citation statements)

References 43 publications

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“…35 The mechanism and kinetics of the ORR on Pt have been studied [6][7][8] to understand the cause of the sub-optimal performance and to identify strategies to optimize the catalytic properties of Pt surfaces. [9][10][11] A common strategy is to identify the most efficient surface structure for the ORR and then try to expose these micro- 40 or nano-structures in the catalysts. 10 To do this, knowledge of the structure-dependence of the ORR activity is required.…”

Section: Introductionmentioning

confidence: 99%

“…27 Finally, for the ORR, SECCM provides a relevant 35 configuration with a three-phase boundary between the solid electrode, liquid electrolyte and gaseous oxygen (air), which mimics the geometry present at the cathode of low temperature fuel cells. This configuration leads to greatly enhanced mass transport of oxygen to the electrode surface, as oxygen is not only 40 provided through the electrolyte solution but also across the liquid-air interface to the electrode surface, while (solutionphase) reaction products can only be transported away from the electrode surface through the electrolyte solution at a slower rate. The impact of this differential mass transport between reactants 45 and products on the ORR kinetics has only rarely been investigated, 40 but is open to study with the approach herein.…”

Section: Introductionmentioning

confidence: 99%

“…Results and Discussion Figure 1A shows a schematic of the setup for SECCM, illustrating the meniscus at the end of the pipette which results in a three phase boundary configuration, so that there is diffusion of oxygen down the two barrels of the pipette as well as from the 40 edge of the droplet across the air-aqueous interface. Figure 1B shows a representative FE-SEM image of the pipette used in SECCM measurement.…”

mentioning

confidence: 99%

“…To investigate the influence of structure on ORR activity, 40 SECCM imaging experiments were performed. For this experiment, the dimensions of the pipette and the footprint of the droplet were measured precisely by FE-SEM.…”

mentioning

confidence: 99%

“…In the map recorded at a low driving potential, 0.65 V ( Figure 3A), grain I can still clearly be distinguished, even when the currents from the other grains are negligible. In general, among the other grains, which are located close to (but not on) 40 the bottom side of the colour legend triangle there are two categories: those close to the (110) basal plane exhibit higher activities than those close to the (100) plane. Thus, in Figure 3, grain II is more active than grain III and grain IV, while in Figure 5, grain II' and grain III' exhibit higher activity than grain IV' and 45 grain V'.…”

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confidence: 99%

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High resolution mapping of oxygen reduction reaction kinetics at polycrystalline platinum electrodes

Chen

Meadows

Cuharuc

et al. 2014

Phys. Chem. Chem. Phys.

111

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The scanning droplet-based technique, scanning electrochemical cell microscopy (SECCM), combined with electron backscatter diffraction (EBSD), is demonstrated as a powerful approach for visualizing surface structure effects on the rate of the oxygen reduction reaction (ORR) at polycrystalline platinum electrodes. Elucidating the effect of electrode structure on the ORR is of major interest in connection to 10 electrocatalysis for energy-related applications. The attributes of the approach herein stem from: (i) the ease with which the polycrystalline substrate electrode can be prepared; (ii) the wide range of surface character open to study; (iii) the possibility of mapping reactivity within a particular facet (or grain), in a pseudo-single crystal approach, and acquiring a high volume of data as a consequence; (iv) the ready ability to measure the activity at grain boundaries; and (v) an experimental arrangement (SECCM) that 15 mimics the three-phase boundary in low temperature fuel cells. The kinetics of the ORR was analyzed and a finite element model was developed to explore the effect of the three-phase boundary, in particular to examine pH variations in the droplet and the differential transport rates of the reactants and products. We have found a significant variation of activity across the platinum substrate, inherently linked to the crystallographic orientation, but do not detect any enhanced activity at grain boundaries. Grains with 20 (111) and (100) contributions exhibit considerably higher activity than those with (110) and (100) contributions. These results, which can be explained by reference to previous single crystal measurements, enhance our understanding of ORR structure-activity relationships on complex high-index platinum surfaces, and further demonstrate the power of high resolution flux imaging techniques to visualize and understand complex electrocatalyst materials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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High resolution mapping of oxygen reduction reaction kinetics at polycrystalline platinum electrodes

Chen

Meadows

Cuharuc

et al. 2014

Phys. Chem. Chem. Phys.

111

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Carbon‐Based, Metal‐Free Catalysts for Electrocatalysis ofORR

Yang

2018

Carbon‐Based Metal‐Free Catalysts

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Hybrid Organic/Inorganic Nanostructures for Highly Sensitive Photoelectrochemical Detection of Dissolved Oxygen in Aqueous Media

Bellani

Ghadirzadeh

Meda

et al. 2015

Adv Funct Materials

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Precise, reliable, and remote measurement of dissolved oxygen in aqueous media is of great importance for many industrial, environmental, and biological applications. In particular, photoelectrochemical sensors working in differential mode have recently demonstrated promising properties, in terms of stability, sensitivity, and application potential. Here, a new approach is presented, combining visible light sensitivity, effi cient photocurrent generation, and solution-processed fabrication methods of conjugated polymers, with charge carriers selectivity, energetic alignment favorable to effi cient interfacial charge transfer and high surface area achievable by using metal oxide nanostructures. Extensive characterization and optimization of the hybrid organic/inorganic system are carried out, leading to the realization of an oxygen sensor device, based on nanostructured palladium oxide/poly[(9,9-dioctylfl uorenyl-2,7-diyl)-alt -5,5-(4′,7′-di-2thienyl-2′,1′,3′-benzothiadiazole]/[6,6]phenyl-C61-butyric acid methyl ester (PdO/APFO-3:PCBM) as materials of choice. State-of-the-art sensitivity, amounting at −5.87 µA cm −2 ppm −1 , low background signal, in the order of −4.85 µA cm −2 , good electrochemical stability for more than 2 h of continuous functioning and high reproducibility of the signal over the pH 1 to 10 range, are reported, making the hybrid device suitable for several practical uses. The results fully validate the mixed organic/inorganic approach for photoelectrochemical applications, and pave the way for its further exploitation in fi elds like waste water treatment, environmental monitoring, and water splitting.

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pH effect on oxygen reduction reaction at Pt(111) electrode

Cited by 128 publications

References 43 publications

High resolution mapping of oxygen reduction reaction kinetics at polycrystalline platinum electrodes

High resolution mapping of oxygen reduction reaction kinetics at polycrystalline platinum electrodes

Carbon‐Based, Metal‐Free Catalysts for Electrocatalysis ofORR

Hybrid Organic/Inorganic Nanostructures for Highly Sensitive Photoelectrochemical Detection of Dissolved Oxygen in Aqueous Media

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