Exploring the Effects of Various Two-Dimensional Supporting Materials on the Water Electrolysis of Co-Mo Sulfide/Oxide Heterostructure

Huynh, Ngoc-Diem; Choi, Won Mook; Hur, Seung Hyun

doi:10.3390/nano13172463

Cited by 3 publications

(4 citation statements)

References 62 publications

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“…This property is also applied in the electrodes used for the oxygen evolution reaction . Owing to this material property, the R ct value decreased. − The resistance and capacitance of the modified electrode decreased to 0.36 × 10 –5 and increased 730 times those of the bare electrode (Table ). These changes revealed that the total impedance of the modified electrode at 1 kHz decreased to over 1/10 6 times that of the bare electrode and was 5 kΩ, which is sufficient for neural stimulation.…”

Section: Discussionmentioning

confidence: 99%

Advanced Flexible Neural Probe Design Using One-Step Chemical Vapor Deposition of Iridium Dioxide Nanoparticles for Neural System Stimulation

Park,

Song,

Jeong

et al. 2024

ACS Appl. Nano Mater.

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Various neural probes that can provide highly precise stimulation and prevent cellular damage and interference have been used to stimulate neural systems such as the brain and spine. These probes are designed to be micron-sized; therefore, they are mechanically fragile and have high impedances. Mechanical fragility can be overcome using flexible probes, which are suitable for long-term applications. However, the impedance of these probes, which is the most important property to be considered for electrical stimulation, is being lowered via diverse methods that have several limitations. In this study, iridium dioxide, which is often used to fabricate electrodes for oxidation–reduction reactions due to its high pseudo capacitance, was coated via a one-step chemical vapor deposition method onto the copper–gold electrodes of a flexible neural probe to decrease the overall impedance of the probe. Unlike other methods, this approach is remarkably simple in its process, requires minimal time, and does not compromise the performance of the flexible neural probe with superior electrochemical properties. The impedance of the probe at 1 kHz decreased from approximately 500 kΩ before the coating to 5 kΩ after the coating. Additionally, in vivo tests on mice revealed that an effective stimulation shape was modulated owing to the distinct surface morphology of the probe. These results indicate that the flexible neural probes coated with iridium dioxide can be used for stimulating neural systems.

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Section: Discussionmentioning

confidence: 99%

Advanced Flexible Neural Probe Design Using One-Step Chemical Vapor Deposition of Iridium Dioxide Nanoparticles for Neural System Stimulation

Park,

Song,

Jeong

et al. 2024

ACS Appl. Nano Mater.

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“…The RE was calibrated according to previously established procedures . The potential obtained from the RE (Hg/HgO) was then converted to the standard reversible hydrogen electrode (RHE) using the Nernst equation: E RHE = E Hg/HgO + 0.92 (V).…”

Section: Experimental Sectionmentioning

confidence: 99%

“…The RE was calibrated according to previously established procedures. 24 The potential obtained from the RE (Hg/HgO) was then converted to the standard reversible hydrogen electrode (RHE) using the Nernst equation: E RHE = E Hg/HgO + 0.92 (V). Linear sweep voltammetry (LSV) was performed at a scan rate of 5 mV/s in the potential range of 1−1.72 V versus RHE.…”

Section: ■ Introductionmentioning

confidence: 99%

Influence of Er₂O₃ Nanoclusters on Transition Metal Oxide Nanostructures in Water Oxidation

Huynh,

Jana,

Chung

et al. 2024

ACS Appl. Nano Mater.

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The search for an effective, stable, and economically viable electrocatalyst for water splitting to replace expensive noble catalysts remains imperative. This investigation evaluates the impact of erbium oxide (Er 2 O 3 ) on the oxygen evolution reaction (OER) activity of transition metal oxides (TMOs), including nickel oxide (NiO), cobalt oxide (Co 3 O 4 ), and iron oxide (Fe 2 O 3 ). Introducing Er 2 O 3 nanoclusters into TMO nanostructures produces a heterostructure interface between Er 2 O 3 and the active TMOs, leveraging Er 2 O 3 's unique 4f electron occupancy as an effective electronic modulator, thus enhancing its electrocatalytic activity. Findings reveal that the Er 2 O 3 and Fe 2 O 3 hybrid (ErFeO) exhibits the most promising OER activity, characterized by low overpotential and Tafel slope, exceptional durability relative to synthesized materials, and outperforming the commercial noble catalyst, RuO 2 . Consequently, ErFeO is a prospective electrocatalyst for OER applications.

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“…For instance, sodium ion-doped, and amorphous Ni 2 P 2 O 7 , and porous Co 2 P 2 O 7 , having different morphologies, were constructed and found to be promising materials in energy storage applications [ 23 ]. Although pyrophosphate-based materials worked well and showed promising electrochemical performance in energy storage devices, it would be ideal to develop a simple and economical way to boost their electrochemical water oxidation performance [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Optimum iron-pyrophosphate electronic coupling to improve electrochemical water splitting and charge storage

Srivastava,

Chaudhary,

Kumar

et al. 2023

Discover Nano

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Tuning the electronic properties of transition metals using pyrophosphate (P2O7) ligand moieties can be a promising approach to improving the electrochemical performance of water electrolyzers and supercapacitors, although such a material’s configuration is rarely exposed. Herein, we grow NiP2O7, CoP2O7, and FeP2O7 nanoparticles on conductive Ni-foam using a hydrothermal procedure. The results indicated that, among all the prepared samples, FeP2O7 exhibited outstanding oxygen evolution reaction and hydrogen evolution reaction with the least overpotential of 220 and 241 mV to draw a current density of 10 mA/cm2. Theoretical studies indicate that the optimal electronic coupling of the Fe site with pyrophosphate enhances the overall electronic properties of FeP2O7, thereby enhancing its electrochemical performance in water splitting. Further investigation of these materials found that NiP2O7 had the highest specific capacitance and remarkable cycle stability due to its high crystallinity as compared to FeP2O7, having a higher percentage composition of Ni on the Ni-foam, which allows more Ni to convert into its oxidation states and come back to its original oxidation state during supercapacitor testing. This work shows how to use pyrophosphate moieties to fabricate non-noble metal-based electrode materials to achieve good performance in electrocatalytic splitting water and supercapacitors.

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Exploring the Effects of Various Two-Dimensional Supporting Materials on the Water Electrolysis of Co-Mo Sulfide/Oxide Heterostructure

Cited by 3 publications

References 62 publications

Advanced Flexible Neural Probe Design Using One-Step Chemical Vapor Deposition of Iridium Dioxide Nanoparticles for Neural System Stimulation

Advanced Flexible Neural Probe Design Using One-Step Chemical Vapor Deposition of Iridium Dioxide Nanoparticles for Neural System Stimulation

Influence of Er₂O₃ Nanoclusters on Transition Metal Oxide Nanostructures in Water Oxidation

Optimum iron-pyrophosphate electronic coupling to improve electrochemical water splitting and charge storage

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Exploring the Effects of Various Two-Dimensional Supporting Materials on the Water Electrolysis of Co-Mo Sulfide/Oxide Heterostructure

Cited by 3 publications

References 62 publications

Advanced Flexible Neural Probe Design Using One-Step Chemical Vapor Deposition of Iridium Dioxide Nanoparticles for Neural System Stimulation

Advanced Flexible Neural Probe Design Using One-Step Chemical Vapor Deposition of Iridium Dioxide Nanoparticles for Neural System Stimulation

Influence of Er2O3 Nanoclusters on Transition Metal Oxide Nanostructures in Water Oxidation

Optimum iron-pyrophosphate electronic coupling to improve electrochemical water splitting and charge storage

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Influence of Er₂O₃ Nanoclusters on Transition Metal Oxide Nanostructures in Water Oxidation