Highly Boosted Oxygen Reduction Reaction Activity by Tuning the Underwater Wetting State of the Superhydrophobic Electrode

Wang, Pengwei; Hayashi, Toru; Meng, Qing; Wang, Qianbin; Liu, Huan; Hashimoto, Kazuhito; Jiang, Lei

doi:10.1002/smll.201601250

Cited by 118 publications

(119 citation statements)

References 32 publications

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“…Gas bubbles must partly or even totally spread on electrode interfaces to form gas pockets or continuous gas films. [16][17][18][19] Therefore, understanding the behaviors of gas bubbles on a solid surface and realizing their reliable manipulation is of vital importance in both scientific research and industrial applications.…”

Section: Doi: 101002/adma201703053mentioning

confidence: 99%

Superwettability of Gas Bubbles and Its Application: From Bioinspiration to Advanced Materials

et al. 2017

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Gas bubbles in aqueous media are common and inevitable in, for example, agriculture and industrial processes. The behaviors of gas bubbles on solid interfaces, including generation, growth, coalescence, release, transport, and collection, are crucial to gas‐bubble‐related applications, which are always determined by gas‐bubble wettability on solid interfaces. Here, the recent progress regarding the study of interfaces with gas‐bubble superwettability in aqueous media, i.e., superaerophilicity and superaerophobicity, is summarized. Some examples illustrate how to design microstructures and chemical compositions to achieve reliable and effective manipulation of gas‐bubble wettability on artificial interfaces. These designed interfaces exhibit excellent performance in gas‐evolution reactions, gas‐adsorption reactions, and directional gas‐bubble transportation. Moreover, progress in the theoretical investigation of gas‐bubble superwettability is reported. Lastly, some challenges are presented, such as the reliable manipulation of gas‐bubble wettability and the establishment of mature theory for exactly and systematically explaining gas‐bubble wetting phenomena.

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Section: Doi: 101002/adma201703053mentioning

confidence: 99%

Superwettability of Gas Bubbles and Its Application: From Bioinspiration to Advanced Materials

et al. 2017

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“…8,9,[37][38][39] Li et al 40 studied the correlation between water adhesion to patterned surfaces made of micropillars and micropores and receding contact angles. They directly observed the dynamics of the receding contact line and analyzed local contact angles on single micropillars.…”

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confidence: 99%

Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

SunYujin

Jiang

ChoiChang-Hwan

et al. 2017

Surface Innovations

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A microelectronic balance system was employed to measure the force of spreading (snap-in force) during water droplet attachment and spreading on polymer surfaces and the water-polymer adhesion forces (maximum adhesion and pulloff forces) after droplet compression, retreat and detachment. Equipped with a charge-coupled device camera and data acquisition software, the instrument measured directly the forces; monitored droplet-surface separation, including distances over which droplet stretched; and collected optical images simultaneously. The images were used to analyze capillary and surface tension forces based on measured droplet shape, surface curvature, droplet base radius and values of contact angles. The forces measured with the microbalance were compared to calculated capillary/surface tension forces. Nearly excellent agreement between directly measured and calculated forces was verified for polymers with smooth surfaces. Experiments with patterned polymers with pores and pillars revealed that interpretation of forces requires knowledge of a triple-contact-line characteristic. One relevant parameter, named normalized contact line length, was introduced to surface tension forces to quantify forces measured directly with a microbalance.

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“…[20] Secondly,ahydrophilic surface on an anostructured electrode may also facilitate the transport of protons/electrons and electrolyte-dissolved O 2 towards the internal micropore, improving the utilization of active sites and resulting in improved catalytic efficiency. [17] It can also result from the surfacet opography such as defects and edges on the carbon matrix.…”

Section: Wettabilitymentioning

confidence: 99%

Engineering the Interface of Carbon Electrocatalysts at the Triple Point for Enhanced Oxygen Reduction Reaction

Qiao

Titirici

2018

Chemistry A European J

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The aqueouso xygen reduction reaction( ORR) has recently received increased attention due to its critical role in clean and sustainable energy-generation technologies, such as proton exchange membranes (PEM) fuel cells, alkaline fuel cellsa nd Zn-airb atteries. The sluggishk inetics associated with ORR result from multistep electron-transfer process. The slow kinetics are partially related to the O 2 adsorption process onto the catalyst,w hich happens at the triple-phase boundary (TPB) of the electrocatalyst-electrolyte-oxygen interface. Hence, tremendous efforts have been devoted to improvingt he intrinsic properties of electrocatalysts such as active sites, electrical conductivity and porosity. Engineering the electrocatalyst's interfacial properties is an-other critical issue in ORR, however less described in the literature. The surface of the catalystp rovides the microenvironment for the triple boundary interface reaction, whichd irectly influences its electrocatalytic activity and the kinetics. This Minireview is as ummary of the existingl iterature on manipulating the interfacial surface of non-precious metal catalysts at the triple point between the solid catalyst, the aqueous electrolyte and the O 2 gas with the aim of improving the ORR efficiency.V arious approaches towards improving the wettability and nanostructuring the catalysts urface to boost the activity of the surface-active sites and provide improved stability are discussed. [a] M. Qiao, Prof. M.-M.Titirici

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Highly Boosted Oxygen Reduction Reaction Activity by Tuning the Underwater Wetting State of the Superhydrophobic Electrode

Cited by 118 publications

References 32 publications

Superwettability of Gas Bubbles and Its Application: From Bioinspiration to Advanced Materials

Superwettability of Gas Bubbles and Its Application: From Bioinspiration to Advanced Materials

Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

Engineering the Interface of Carbon Electrocatalysts at the Triple Point for Enhanced Oxygen Reduction Reaction

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