Electrochemical Stability and Oxidation Mechanism of Carbon Support for PEM Fuel Cell

Yadav, Amar Prasad; Sugawara, Yuu; Nishikata, Atsushi; Tsuru, Tooru

doi:10.1149/1.2982049

Cited by 8 publications

(3 citation statements)

References 9 publications

(20 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the hydrophobic interaction of HQ and CTAB increases the effective volume of the hydrophobic chains of the CTAB bilayer, promoting the spherical to rod-like micellar transition, , which constitutes soft templates for AuNR growth (Figure a). Finally but crucially, the addition of HQ preceding HAuCl 4 (Figure S3a, Supporting information) endows the HQ with the possibility to reduce Ag + to Ag 0 , as the standard redox potential for HQ is +0.7 V, which is lower than that of Ag + /Ag (+0.8 V) but higher than that of AgBr/Ag (+0.07 V) . Thereby, Ag + might be partially reduced to a Ag 0 atom, which later favors the symmetry-breaking event (SBE) toward Au 0 seeds.…”

Section: Resultsmentioning

confidence: 99%

Precise Tailoring of Mesoporous Silica-Coated Gold Nanorods for Laser Ignition at 1064 nm

Sheng

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The plasmon-induced photothermal effect is often regarded as one of the most intriguing features of Au nanorods (AuNRs). The spectral matching of absorption and excitation determines the optical absorption quantity and the photothermal conversion efficiency, which is essential for practical applications. Although the dimensional tunability of monodisperse AuNRs has already been accessible, the fine-tuning of AuNRs with longitudinal surface plasmon resonance (LSPR) at a desired wavelength to match the excitation is still challenging because of inferior reproducibility and synthetic complexity. In this work, using hydroquinone as both a cosurfactant and a reductant, we propose a synthetic strategy toward AuNRs with excellent linear tunability of LSPR peaks from 530 to 1200 nm via simply altering the dosage of silver nitrate. Given that the laser wavelength for ignition is 1064 nm, the LSPR wavelength of AuNRs could be exactly controlled at 1064 nm for maximum photothermal performance. Afterward, the as-prepared AuNRs were coated with a dendritic mesoporous silica shell for plasmonic stability and loading explosive molecules. As a proof of concept, the laser ignitability could be achieved only in the presence of AuNRs with LSPR wavelength approaching 1064 nm, highlighting the importance of spectral matching in photothermal conversion-assisted laser ignition.

show abstract

Section: Resultsmentioning

confidence: 99%

Precise Tailoring of Mesoporous Silica-Coated Gold Nanorods for Laser Ignition at 1064 nm

Sheng

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…The standard redox potential of PtCl 4 2‑ /Pt (+0.76 V) is lower than that of Ag + /Ag (+0.8 V) which allows the galvanic reaction to occur. For the reducing agents, the redox potential for HQ is E ° = 0.7 V, and for AA is E ° = 0.35 V. , The more positive the potential is, the greater the species’ affinity for electrons and the more the species tends to be reduced. From this, we know that the AA has more positive potential, which means a stronger reducing ability, in terms of reducing PtCl 4 2‑ to Pt and Ag + to Ag than HQ has.…”

Section: Resultsmentioning

confidence: 99%

Impact on the Formation and Catalytic Property of Pt-Based Nanocatalysts by Galvanic Reaction with Co-Reduction Agents

et al. 2022

View full text Add to dashboard Cite

It has been shown that controlling the morphology and composition of Pt-based nanocrystals can effectively enhance catalytic properties. We report a detailed study on the impact of using co-reducing agents in the galvanic replacement reaction (GRR) between Ag shell templates and Pt precursors to better control the morphology, composition, and resulting performance of the fabricated Pt-based catalysts. Mesoporous silica-supported silver shell-coated gold nanodumbbell nanostructures (AuNDB@Ag@mSiO2) are synthesized via reducing silver ions which have penetrated through the mSiO2 layer and then be deposited on the surface of the AuNDBs. These are used as templates and the morphology and optical properties of these templates can be adjusted by altering the amount of Ag+ in the depositing condition. The mSiO2 layer shows some flexibility and does not influence the silver shell formation on the surface of AuNDBs. Additionally, the thickness of the silver shell of the template and the strength of the reducing agent used in the GRR impact the morphology, composition, and catalysis performance of the resulting Pt-based catalysts. A plausible mechanism on those observations is studied and discussed.

show abstract

“…Furthermore, weak peak structures are apparent that indicate reversible redox reactions occurring between 0.3 and 0.4 V vs. Ag/AgCl, which are likely to arise from the presence of redox active hydroquinone-like structures or other oxygen-containing redox active groups on the glassy carbon. 26 Pt was deposited onto the sputtered carbon layer in the same sputtering process. This is important as the carbon cannot oxidize or change due to contaminants of the air.…”

Section: Magnetron-sputtering Of C and Pt/c Sputtered At Different Su...mentioning

confidence: 99%

Combined Balanced Magnetron Sputtering and Substrate-Annealing Synthesis for Pt and Pt/C Oxygen Reduction Catalysts

Sievers

Quade

Kruth

et al. 2016

J. Electrochem. Soc.

View full text Add to dashboard Cite

The objective of this work is to enhance the understanding of magnetron-sputtered electrocatalytic films as a technological approach for proton exchange membrane fuel cell catalyst development especially with Pt and Pt/C sputtered layers on glassy carbon electrodes and gas diffusion electrodes. We have developed a dual-magnetron process for the deposition of Pt catalyst and a graphitic C catalyst support onto glassy carbon at elevated substrate temperatures. We characterized the different layers by XRD, XPS, SEM, cyclic voltammetry and linear sweep voltammetry. The electrocatalytic activity of Pt and Pt/C sputtered layers for the oxygen reduction reaction was found to be enhanced at higher temperatures. It was possible to synthesize carbon layers with slight graphitic characteristics as Pt support. Comparisons of the electrochemical properties of Pt and Pt/C sputtered layers showed a higher oxygen reduction activity for Pt deposited directly onto glassy carbon. However, the Pt structure was also observed to be significantly influenced by temperature, agglomeration occured. Pt deposition onto the graphitic carbon support on the other hand resulted in deposition of small Pt crystals, which were also stable at high temperatures. The catalyst structure before and after electrochemical testing indicates an increased stability at higher substrate temperatures during deposition and more crystal-like Pt assemblies versus an higher Pt mobility with particle-like Pt assemblies deposited at room temperature.

show abstract

Electrochemical Stability and Oxidation Mechanism of Carbon Support for PEM Fuel Cell

Cited by 8 publications

References 9 publications

Precise Tailoring of Mesoporous Silica-Coated Gold Nanorods for Laser Ignition at 1064 nm

Precise Tailoring of Mesoporous Silica-Coated Gold Nanorods for Laser Ignition at 1064 nm

Impact on the Formation and Catalytic Property of Pt-Based Nanocatalysts by Galvanic Reaction with Co-Reduction Agents

Combined Balanced Magnetron Sputtering and Substrate-Annealing Synthesis for Pt and Pt/C Oxygen Reduction Catalysts

Contact Info

Product

Resources

About