Electroactivity of nanoporous platinum depending on the porosity and potential for various electrode reactions

Cho, Yun-Bin; Kim, Ji Eon; Lee, Chongmok; Lee, Young-Mi

doi:10.1016/j.jelechem.2016.03.002

Cited by 5 publications

(2 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Advances in the fabrication of nanoporous electrodes with uniform pore structures have led to the application of nanoporous electrodes in electrochemical reactions, such as catalysis and sensors. Research on novel electrochemical phenomena induced by the structure of nanoporous electrodes has been actively conducted in recent years. − Nanoporous materials are also attracting attention as a way to easily impart selectivity to electrodes, and selectivity studies utilizing the nanoconfined structure of nanoporous electrodes have been mainly characterized by the reaction rate, size, and charge of the reactants. − In other words, the slower the reaction rate, the smaller the size of the reactant species, and the deeper the reactant species that can enter the nanopore, the more selectively the electrochemical signal can be amplified. In addition, a study has been reported on imparting selectivity by introducing reactants with opposite charges to the electrodes into the nanopores by using the electric double-layer overlapping phenomenon in the nanopore electrodes. , …”

Section: Introductionmentioning

confidence: 99%

Selectivity of Electrochemical Reactions Based on Adsorption at Nanoporous Electrodes

Yang,

Kim,

Bae

2023

Anal. Chem.

View full text Add to dashboard Cite

Enhancing selectivity is a pivotal area of research when electrodes are utilized as catalysts or sensors. Nanoporous electrodes are representative electrode materials for diverse applications, such as catalysts and sensors. Selectivity arising from nanoporous structures has been applied to systems involving nonfaradaic reactions such as capacitive deionization, electrochemical supercapacitors, and conductometry. Since selectivity in faradaic reactions has primarily been explored based on reactivity and molecular charge and size, we propose that the surface adsorption of reactant molecules can be considered as another crucial factor in achieving selectivity. Our observations reveal that the nonadsorptive reaction of 2-propanol and 2-butanol experienced a more pronounced enhancement compared to the adsorptive reaction of 1propanol and 1-butanol at nanoporous Pt electrodes, owing to the nanoconfinement effect. Even within the same molecule with a mixture of adsorptive and nonadsorptive reactions, the degree of influence of the nanostructure depends on the adsorptive capacity of the reaction, which affects the overall selectivity. Moreover, the size effect of the reactants in the nanoporous electrode is also dependent on the degree of adsorption. These findings provide valuable insights into the effective utilization of nanoporous materials as catalysts or sensors.

show abstract

Section: Introductionmentioning

confidence: 99%

Selectivity of Electrochemical Reactions Based on Adsorption at Nanoporous Electrodes

Yang,

Kim,

Bae

2023

Anal. Chem.

View full text Add to dashboard Cite

show abstract

“…Therefore, electrochemical reactions at nanoporous electrodes can be selectively enhanced or diminished by the properties of the redox molecules, such as charge, 16 molecular size, 17,18 and kinetics. 19,20 This selective change in the electrochemical signals has been applied to catalysts, electrochemical sensors, and biosensors. 9,21 In addition to redox molecules, the transport of ions into the nanopores is also affected by the steric hindrance of the nanoporous structure.…”

mentioning

confidence: 99%

Effects of Ionic Size and Hydrophobicity on Charging Dynamics at Microporous Pt

Kim¹,

Shin²,

Yang³

et al. 2022

J. Electrochem. Soc.

View full text Add to dashboard Cite

Nanoporous electrodes with extremely small pores have been developed for improved supercapacitors and electroanalysis. Ion transport into nanoconfined spaces has been studied using nanoporous carbon. Herein, we explore the size effect and hydrophobicity of ions on the charging dynamics using microporous Pt by cyclic voltammetry and electrochemical impedance spectroscopy. As the size of the effective hydrated ions decreased, the capacitance increased, and the movement of ions into and within the nanopores was less restricted. The effect of ionic size was more pronounced for hydrophobic organic cations than for hydrophilic alkali cations in microporous Pt. In addition, the microporous Pt electrode exhibited better performance in terms of capacitance and charging dynamics than the mesoporous carbon electrode when the hydrophilic electrolyte is dissolved in an aqueous solution. These findings provide insight into the formation of an electrical double layer at microporous metal electrodes and their applications in supercapacitors, electrocatalysts, and electroanalysis.

show abstract

Selective Enhancement of Electrochemical Signal Based on the Size of Alcohols Using Nanoporous Platinum

Bang¹,

Han

Shin

et al. 2021

ChemElectroChem

View full text Add to dashboard Cite

Nanoporous electrodes are representative electrode materials for diverse applications, such as energy conversion devices and sensors. Recently, selectivity based on the size of ions arising from nanoporous structures has been applied to capacitive deionization, electrochemical supercapacitors, and conductometry. Herein, we explored the selectivity based on the size of the redox molecules on the electrochemical reaction at the nanoporous Pt electrode with extremely small (1-2 nm) and uniform pores by linear sweep voltammetry and AC impedance spectroscopy. Among primary alcohols with sizes smaller than that of the pores, we observed exceptional selective enhancement in the case of methanol due to its smallest size, despite all the alcohols having a similar reaction mechanism. These findings may provide an insight into electrochemical analysis and electrocatalysis based on nanoporous structures.Devices based on electrochemical principles, such as energyconversion devices (for example, batteries, supercapacitors, fuel cells, and solar cells) and chemical/bio sensors are ubiquitous. The performance of these devices depends on the properties of the electrodes. Rapid advances in nanoscience and nanotechnology have led to an increased interest in nanoscale electrochemistry to improve the performance of these devices. Recently, nanoporous electrodes have been extensively utilized in the fields of energy conversion, sensors, and catalysts owing to their high surface-to-volume ratio. [1] More recently, the effect

show abstract

Electroactivity of nanoporous platinum depending on the porosity and potential for various electrode reactions

Cited by 5 publications

References 39 publications

Selectivity of Electrochemical Reactions Based on Adsorption at Nanoporous Electrodes

Selectivity of Electrochemical Reactions Based on Adsorption at Nanoporous Electrodes

Effects of Ionic Size and Hydrophobicity on Charging Dynamics at Microporous Pt

Selective Enhancement of Electrochemical Signal Based on the Size of Alcohols Using Nanoporous Platinum

Contact Info

Product

Resources

About