Dopamine-induced Pt and N-doped carbon@silica hybrids as high-performance anode catalysts for polymer electrolyte membrane fuel cells

Seok, Seunghwan; Choi, Insoo; Lee, Kyoung G.; Choi, Bong Gill; Park, Kyun Joo; Park, Jung Yuon; Kwon, Oh Joong; Lee, Seok Jae; Kim, Do Hyun

doi:10.1039/c4ra06819j

Cited by 12 publications

(13 citation statements)

References 18 publications

(5 reference statements)

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“…1b, the absorption peak at around 1625 cm −1 was assigned to the N-H bending vibration, and the peak intensity increased after being modified with PDA, indicating the successful introduction of PDA. Besides, it can also be found that the vibrations at 1625 and 1650 cm −1 were inhibited after loading the Pt species on CNTs@PDA, which is due to the effect of anchoring Pt nanoparticles [28][29][30]. From the Raman spectra in Fig.…”

Section: Resultsmentioning

confidence: 90%

“…3a and the data in Table S3, the C 1s spectra were deconvoluted into five peaks at about 284.8, 285.4, 286.1, 287.4 and 288.6 eV, belonging to graphitic C, C-N, C-O, C=O and O-C=O, respectively, suggesting the interaction between N and the surrounding C atoms [33,34]. Especially, C=O and O-C=O peaks were found only after the deposition of Pt due to that the phenols of PDA can act as nucleation sites and self-reducing agents which convert catechol to quinone or O-C=O during the photo-reduction process [30]. The XPS spectra of O 1s for the catalysts are displayed in Fig.…”

Section: Science China Materialsmentioning

confidence: 99%

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Size effects of platinum particles@CNT on HER and ORR performance

Tian

Meng

et al. 2020

Sci. China Mater.

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Platinum (Pt) is an efficient catalyst for hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR), but the debate of the relevance between the Pt particle size and its electrocatalytic activity still exist. The strong metal-support interaction (SMSI) between the metal and carrier causes the charge transfer and mass transport from the support to the metal. Herein, Pt species (0.5 wt.%) with various particle sizes supported on carbon nanotubes (CNTs) have been synthesized by a photo-reduction method. Thẽ 1.5 nm-sized Pt catalyst shows much higher HER performance than the counterparts in all pH solutions, and the mass activity of it is even 23-36 times that of Pt/C. While for ORR, the~3 nm-sized Pt catalyst exhibits the optimal performance, and the mass activity is 3 times and even 16 times that of Pt/C in acidic and alkaline media, respectively. The high HER and ORR performances of the~1.5 nm-and~3 nm-sized Pt catalysts benefit from the SMSI between Pt and the CNTs matrix and the higher ratio of face sites to edge sites, which is meaningful for the design of efficient electrocatalysts for renewable energy application.

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Section: Resultsmentioning

confidence: 90%

Section: Science China Materialsmentioning

confidence: 99%

Size effects of platinum particles@CNT on HER and ORR performance

Tian

Meng

et al. 2020

Sci. China Mater.

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“…The conjugated aromatic structures exhibit a planar structure and further react with each other to form PDA over the PU frame. [32][33][34] Finally, the etched PU surface was covered with PDA. The continuous chemical structural changes were evident from the FT-IR spectra as shown in Figure 3a 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 Once the siloxane seed was attached over etched PU structures, the subsequent condensation of silane began to attach over the seed to form thin polysiloxane layers that finally covered the entire of PU backbones ( Figure S4b).…”

Section: Surface Modification Of Pumentioning

confidence: 99%

Multifunctional Polyurethane Sponge for Polymerase Chain Reaction Enhancement

Seok

Shin

Lee

et al. 2015

ACS Appl. Mater. Interfaces

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Selective filtering of target biomaterials from impurities is an important task in DNA amplification through polymerase chain reaction (PCR) enhancement and gene identification to save endangered animals and marine species. Conventional gene extraction methods require complicated steps, skilled persons, and expensive chemicals and instruments to improve DNA amplification. Herein, we proposed an alternative method for overcoming such challenges by imparting secondary functionality using commercially available polyurethane (PU) sponges and cost-effective fabrication approaches through polydopamine and polysiloxane coatings. The porous, highly flexible, and chemically modified superhydrophilic and superhydrophobic PU sponges allow large surface areas and mechanically stable frames for effective extraction of genomic DNA through selective filtering of fish tissues and oils. Furthermore, these chemically modified PU sponges allow separation of genes and improvement of PCR for DNA amplification for the identification of fish species. The combination of a simple fabrication method and functionalized PU sponges could be a useful platform for PCR enhancement and gene-based identification of species for practical applications.

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“…It is a challenge, however, to increase the platinum doping and enhance catalyst conductivity. With our bio-coating strategy for metal doping, we demonstrate a successful implementation of N-doped carbon composite through a silica-based templating technique [9]. In contrast to other reported methods that use chemical vapor deposition (CVD) and plasma treatment of various nitrogen precursors, our method remains on the practical side requiring no expensive equipment and complex treatment processes.…”

Section: Hybrid Catalysts For Polymer Electrolyte Membrane Fuel Cellsmentioning

confidence: 99%

“…We also used Pt nanoparticle as the anode catalyst for PEMFC. To deposit Pt nanoparticles on the surface of silica, we applied dopamine coating as an adhesive layer [9]. The overall synthesis procedure for the metal and dopamine-induced carbon@silica nanocomposite is illustrated in Figure 15.…”

Section: Dopamine-induced Carbon@silica Hybrid As Fuel Cell Anode Catmentioning

confidence: 99%

Practical Design of Green Catalysts for PET Recycling and Energy Conversion

Sangalang¹,

Seok²,

Kim³

2016

Advanced Catalytic Materials - Photocatalysis and Other Current Trends

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The recycling of chemicals and generation of alternative energy are central topics in the efforts toward sustainable development. Among these, research on plastics recycling and fuel cells has received significant attention, with the aim of designing novel catalysts to improve yield and efficiency. We highlight our work on these areas focusing on the chemical depolymerization of polyethylene terephthalate PET to recover its constituent monomer and the development of high-performance anode catalysts for polymer electrolyte membrane fuel cells PEMFC . We demonstrate various flexible yet practical synthesis strategies e.g. ultrasound-assisted deposition and biopolymer coating that were used to obtain catalytic properties optimized for these applications. The effectiveness and simplicity of these methods render the catalysts to be truly green from synthesis up to process application.

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Dopamine-induced Pt and N-doped carbon@silica hybrids as high-performance anode catalysts for polymer electrolyte membrane fuel cells

Cited by 12 publications

References 18 publications

Size effects of platinum particles@CNT on HER and ORR performance

Size effects of platinum particles@CNT on HER and ORR performance

Multifunctional Polyurethane Sponge for Polymerase Chain Reaction Enhancement

Practical Design of Green Catalysts for PET Recycling and Energy Conversion

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