Improved performance and stability of direct borohydride fuel cells (DBFCs) with porous polypyrrole support

Sombatmankhong, Korakot

doi:10.1007/s10934-015-9940-x

Cited by 12 publications

(6 citation statements)

References 27 publications

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“… 119,120 Rozlívková et al 121 reported, that the conductivity of carbonized polyaniline increases with increasing temperature, reaching a maximum value of 8.6 × 10 −4 S cm −1 at 800 °C, while the nitrogen content did not change significantly. Sombatmankhong 122 produced a multi-layered macro/mesoporous polypyrrole by electropolymerization and compared its performance with bulk polypyrol as well as commercial carbon black Vulcan XC-72, maintaining the same reaction conditions. The power density reached 56 mW cm −2 due to an almost 3-fold increase of SSA and V total .…”

Section: Role Of Carbon Materials In Dbfcmentioning

confidence: 99%

“…According to the author, the macroporous structure significantly increased the number of reaction sites, which consequently increased the rate of electrochemical reaction. 122 Oliveira et al 123 tested a Pt/polypyrrole-carbon composite (Pt-PPy-C) with different Vulcan XC-72 content (5–35 wt%) and established that the one with the highest carbon content generated the highest current density of 28 mA cm −2 among other composites ( Fig. 12A ).…”

Section: Role Of Carbon Materials In Dbfcmentioning

confidence: 99%

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Control of hydrogen release during borohydride electrooxidation with porous carbon materials

Graś

Lota

2021

RSC Adv.

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Section: Role Of Carbon Materials In Dbfcmentioning

confidence: 99%

Section: Role Of Carbon Materials In Dbfcmentioning

confidence: 99%

Control of hydrogen release during borohydride electrooxidation with porous carbon materials

Graś

Lota

2021

RSC Adv.

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“…It can be observed by the pore size distribution plots of PPy/PVC/PDA@FG-NH 2 that pore size below 4 nm mainly contributed by carbon. 49,50 The influence of grafting of various polymers and linker on BET surface area and pore volume is enlisted in Table 5. It was observed that both surface area and pore volume first increase and then decrease.…”

Section: Surface Area and Porositymentioning

confidence: 99%

Influence of pyrrole feeding ratios on physicochemical characteristics of high-performance multilayered PPy/PVC/PDA@FG-NH₂nanocomposites

Naz

Sattar

Siddiq

et al. 2019

Journal of Thermoplastic Composite Materials

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Nanocomposites of conjugated polymers polypyrrole (PPy) and polyvinyl chloride (PVC) as matrices and 1,4-phenylenediamine (PDA) as a linker with amine functional graphite (FG-NH2) as filler have been efficiently fabricated using in situ oxidative polymerization, and the effect of various mass ratios on physicochemical characteristics of prepared nanocomposite was investigated. The layer-by-layer oxidative polymerization of various matrices on host filler surface is confirmed by Fourier transform infrared, energy dispersive X-ray, and X-ray photoelectron spectroscopy examinations. Field emission scanning electron microscopy revealed fibrillary morphology of obtained nanocomposites. Thermal stability, glass transition temperature, and melting and crystallization temperature of the nanocomposites were increased with the incorporation of modified graphite. Brunauer–Emmett–Teller analysis explored the improved adsorption capacity (128 cm3 g−1) of the nanocomposite with higher feeding ratio of pyrrole. The influence of FG-NH2 and pyrrole on electrical conductivity performance of composites was also investigated. Functionalized graphite in the resultant PPy/PVC/PDA@FG-NH2 nanocomposites played an important role in forming conducting network in PPy matrix indicating synergistic effect between PPy and FG-NH2.

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“…Direct borohydride fuel cells (DBFCs) are considered one of the most promising energy sources and are widely used in portable batteries and residential devices. DBFCs have a high theoretical energy density (17 kWh kg −1 ) and open-circuit voltage (1.64 V) [1][2][3]. In alkaline media, BH4 − ions can release 8 electrons when completely oxidized in the anode [3].…”

Section: Introductionmentioning

confidence: 99%

The microstructural refinement and performance improvement of a nanoporous Ag/CeO₂ catalyst for NaBH₄ oxidation

Ma¹,

Wen²,

He³

et al. 2021

Nanotechnology

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In this paper, Cu and Ce were added to melt-spun Al–Ag precursor alloys to refine the microstructures of nanoporous Ag and Ag/CeO2 composite catalysts for NaBH4 oxidation. After the precursor alloys were dealloyed in 20% NaOH, calcined in air and corroded again in 50% NaOH, Ag2Al in the precursor alloys was completely removed, and refined nanoporous Ag could be obtained; from this process, the finest microstructures were exhibited by Al84Ag8Cu8. When more than 0.3% Ce was added to the Al84Ag8Cu8 ribbons, a refined nanoporous Ag material that consisted of CeO2 nanorods interspersed between Ag ligaments was obtained. Electrochemical measurements indicated that the catalytic properties were clearly increased due to the Cu addition to the Al–Ag alloy. After Ce was added to the Al84Ag8Cu8 ribbons, the catalytic properties of the resulting material were further improved. In regard to melt-spun Al84Ag8Cu8Ce0.5, the obtained nanoporous Ag/CeO2 presented the best properties, and its current density was 2.5 times that of Al84Ag8Cu8, 3.1 times that of Al90Ag8Cu2 and 2.3 times that of Ag/Ce from the Al79Ag15Ce6 precursor alloy without Cu. It was believed that the core–shell structure composed of Ag and Cu-rich phases formed during dealloying could limit the diffusion of Ag and prevent the coarsening of Ag ligaments. Thus, the refined microstructures could provide a large specific surface or additional active sites for the catalytic reaction. Strong interactions resulted from the many interfaces between the Ag ligaments and interspersed CeO2 nanorods, and the more effective utilization of Ag was due to the decomposition of Ag2Al; this result was the key reason for the clear improvement in catalytic performance.

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Improved performance and stability of direct borohydride fuel cells (DBFCs) with porous polypyrrole support

Cited by 12 publications

References 27 publications

Control of hydrogen release during borohydride electrooxidation with porous carbon materials

Control of hydrogen release during borohydride electrooxidation with porous carbon materials

Influence of pyrrole feeding ratios on physicochemical characteristics of high-performance multilayered PPy/PVC/PDA@FG-NH₂nanocomposites

The microstructural refinement and performance improvement of a nanoporous Ag/CeO₂ catalyst for NaBH₄ oxidation

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Improved performance and stability of direct borohydride fuel cells (DBFCs) with porous polypyrrole support

Cited by 12 publications

References 27 publications

Control of hydrogen release during borohydride electrooxidation with porous carbon materials

Control of hydrogen release during borohydride electrooxidation with porous carbon materials

Influence of pyrrole feeding ratios on physicochemical characteristics of high-performance multilayered PPy/PVC/PDA@FG-NH2nanocomposites

The microstructural refinement and performance improvement of a nanoporous Ag/CeO2 catalyst for NaBH4 oxidation

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Influence of pyrrole feeding ratios on physicochemical characteristics of high-performance multilayered PPy/PVC/PDA@FG-NH₂nanocomposites

The microstructural refinement and performance improvement of a nanoporous Ag/CeO₂ catalyst for NaBH₄ oxidation