Confined Molecular Dynamics for Suppressing Kinetic Loss in Sugar Fuel Cell

Han, Ji-Hyung; Bae, Je Hyun; Han, Donghyeop; Chung, Taek Dong

doi:10.1016/j.electacta.2015.11.079

Cited by 10 publications

(6 citation statements)

References 51 publications

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“…In other words, it was confirmed that selective reactivity due to adsorption was a phenomenon caused by the nanoconfinement effect. In a previous paper, by comparing the electrode with an f R of 6 and the electrode with an f R of 45, which is similar to the f R used in this experiment, we also observed an enhanced electrocatalytic activity due to the nanoconfinement effect based on the nanoporous structure …”

Section: Resultssupporting

confidence: 74%

Selectivity of Electrochemical Reactions Based on Adsorption at Nanoporous Electrodes

Yang,

Kim,

Bae

2023

Anal. Chem.

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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.

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Section: Resultssupporting

confidence: 74%

Selectivity of Electrochemical Reactions Based on Adsorption at Nanoporous Electrodes

Yang,

Kim,

Bae

2023

Anal. Chem.

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“…This means the nanoconfined space formed in nanoporous Pt could influence electrochemical reactions at the molecular level. Confinement factor can be defined as the increment in the current at the nanoporous Pt over flat Pt, which is corrected by the ECSA ratio of nanoporous Pt to flat Pt [10] . The confinement factor of 1.78 for methanol indicates enhanced electrocatalytic activity at the nanoporous Pt by the nanoporous structure.…”

Section: Methodsmentioning

confidence: 99%

“…Confinement factor can be defined as the increment in the current at the nanoporous Pt over flat Pt, which is corrected by the ECSA ratio of nanoporous Pt to flat Pt. [10] The confinement factor of 1.78 for methanol indicates enhanced electrocatalytic activity at the nanoporous Pt by the nanoporous structure. The reason for this behavior is still unclear; however, a plausible explanation is that the reactants could collide more frequently with the electrode surface in nanoconfined spaces, which enhances electrocatalysis.…”

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confidence: 99%

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

Bang¹,

Han

Shin

et al. 2021

ChemElectroChem

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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

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“…[28] Under these circumstances, protons and hydroxide ions from WD in the BPM play an important role in the charge-transfer reaction. The confinement effect [29,30] of the porous structure also increases reactant's stay near the electrode surface, which enables protons and hydroxide ions generated from the WD to undergo electron transfer. Most importantly, since seawater is acidified only when the protons produced by the WD of BPM diffuse into the bulk catholyte, the basification of seawater observed indicates that the proton reduction reaction actually occurs.…”

Section: Chemsuschemmentioning

confidence: 99%

Exploring the Interface of Porous Cathode/Bipolar Membrane for Mitigation of Inorganic Precipitates in Direct Seawater Electrolysis

Han

2022

ChemSusChem

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Direct seawater electrolysis utilizes natural seawater as the electrolyte. Hydroxide ions generated from the hydrogen evolution reaction at the cathode induce the precipitation of inorganic compounds, which block the active sites of the catalysts, leading to high cell voltage. To mitigate inorganic scaling, herein, an optimized interface between a porous electrode and a bipolar membrane (BPM, as a separator) was suggested in zero-gap seawater electrolyzers. Despite the formation of inorganic deposits at the front side (facing bulk seawater) of the porous cathode due to the water reduction reaction, the back side facing the cation exchange layer of the BPM remained free from thick inorganic deposits. This was ascribed to the locally acidic environment generated by proton flux from water dissociation at the BPM, enabling stable hydrogen production via the proton reduction at low overpotential. This asymmetric hydrogen evolution reaction at the porous cathode led to a considerably lower cell voltage and higher stability than that achieved with the mesh electrode. Moreover, precipitation at the front side of the porous cathode was further mitigated through acidification of the seawater by introducing an open area of the BPM that was not in contact with the porous cathode, allowing free protons that were not involved in the electron transfer reaction to diffuse out into the bulk seawater. These findings may provide critical guidance for the investigation of interfacial phenomena for the complete mitigation of inorganic scaling in the direct electrolytic splitting of seawater.

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Confined Molecular Dynamics for Suppressing Kinetic Loss in Sugar Fuel Cell

Cited by 10 publications

References 51 publications

Selectivity of Electrochemical Reactions Based on Adsorption at Nanoporous Electrodes

Selectivity of Electrochemical Reactions Based on Adsorption at Nanoporous Electrodes

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

Exploring the Interface of Porous Cathode/Bipolar Membrane for Mitigation of Inorganic Precipitates in Direct Seawater Electrolysis

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