Facile preparation of ultra-low Pt loading graphene-immobilized electrode for methanol oxidation reaction

Toh, Shaw Yong; Loh, Kee Shyuan; Kamarudin, Siti Kartom; Daud, Wan Ramli Wan

doi:10.1016/j.ijhydene.2018.07.016

Cited by 12 publications

(3 citation statements)

References 56 publications

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“…When the lower potential E L of the pulse square wave is applied, the deposition of Pd 2+ ions in solution with the nucleation and growth of Pd particles on the carbon paper occur. The deposition process and the dissolution process are related to values of E U , E L , frequency, and ions concentration [37][38][39]. Limited by the low Pd 2+ ion concentration of the solution, the rate of deposition is lower than that of dissolution under the selected SWPT potential (as shown in Figure 2c).…”

Section: Characterizations Resultsmentioning

confidence: 98%

Palladium Particles Modified by Mixed-Frequency Square-Wave Potential Treatment to Enhance Electrocatalytic Performance for Formic Acid Oxidation

Liu

Shen

et al. 2021

Catalysts

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Palladium catalysts have attracted widespread attention as advanced electrocatalysts for the formic acid oxidation (FAO) due to their excellent electrocatalytic activity and relatively high abundance. At present, electrodeposition methods have been widely developed to prepare small-sized and highly-dispersed Pd electrocatalysts. However, the customary use of surfactants would introduce heterogeneous impurities, which requires complicated removal processes. In this work, we reported a two-step electrochemical method that employed square-wave potential treatment (SWPT) to modify electrodeposited Pd particles without the use of capping agents. Under the SWPT with a mixed frequency, Pd particles show significantly reduced size and more dispersed distribution, exhibiting a high mass activity of 1.43 A mg−1 toward FAO, which is 4.6 times higher than the counterpart of commercial Pd/C. The increase in electrocatalytic activity of FAO is attributed to the highly developed surface of palladium particles uniformly distributed over the support surface.

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Section: Characterizations Resultsmentioning

confidence: 98%

Palladium Particles Modified by Mixed-Frequency Square-Wave Potential Treatment to Enhance Electrocatalytic Performance for Formic Acid Oxidation

Liu

Shen

et al. 2021

Catalysts

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“…Furthermore, Kwok et al 108 investigated graphene/CNT composite aerogels with Ru@Pt nanoparticles as porous electrodes for direct microfluidic fuel cells, where the CNTs enhanced the composite conductivity by linking the GO nanosheets together. Toh et al 109 reported an easy preparation method for graphene‐immobilized electrodes with ultralow platinum loads. ANOVA and a signal‐to‐noise assessment (S/N) confirmed the ideal electrode position requirements for GN‐Pt NP electrodes, as predicted to obtain the optimum conditions for electrode production.…”

Section: Catalysts For Fuel Cell Technologymentioning

confidence: 99%

Application of graphene inlow‐temperaturefuel cell technology: An overview

et al. 2021

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Summary Fuel cells offer the possibility of zero‐emission electricity generation and increased energy security. However, fuel cell technology, particularly the low‐temperature fuel cell, still has some major problems that hinder their commercialization, including costly components, durability issues, hydration, and an efficiency loss of approximately 60% during operation. Recently, graphene has been introduced as a potential solution to enhance the performance of fuel cell systems. This article presents a review on the application of graphene in fuel cell technology and the presentation of the electrochemical characteristic of graphene. This article also summarizes the recent research trends in graphene and its economic aspects, with a discussion on the modifications that increases the graphene strength along with other benefits for the future development of graphene technology. Finally, this work also addressed the current problems and future advances in adopting graphene in a low‐temperature fuel cell system.

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“…Direct methanol fuel cells (DMFCs) are devices used to convert the chemical energy stored in methanol into electricity through a clean, safe, and energy-efficient process. Their utilization displaces fossil fuels and reduces CO 2 emissions. − …”

Section: Introductionmentioning

confidence: 99%

Two-Step Dry Synthesis of Binderless 3D Low Pt-Loading Electrocatalysts for Direct Alkaline Methanol Fuel Cell Anodes

Pajootan

Coulombe

Omanovic

2021

ACS Appl. Energy Mater.

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Three-dimensional (3D) porous electrocatalysts of low platinum loading were synthesized by gas-phase pulsed laser ablation (PLA) and deposited on multiwalled carbon nanotubes (MWCNTs) directly grown on a stainless steel mesh current collector by catalyst-free chemical vapor deposition (Pt/MWCNT/SS). The performance of the developed electrocatalysts was evaluated for the methanol oxidation reaction (MOR). The PLA chamber pressure and ablation time were optimized to achieve the highest methanol oxidation current per Pt loading and electrochemically active surface area while maintaining structural stability. The most robust electrocatalyst, obtained with PLA at 10–5 Torr for 5 min, exhibited a 50% higher methanol oxidation current compared to the commercial Pt/C with similar Pt loading. In addition, it showed the lowest loss of active sites after stability tests while maintaining its structural integrity. Increasing the electrolyte temperature from 0 to 80 °C significantly improved the methanol oxidation current on Pt/MWCNT/SS by 13 times compared to 5.8 times for Pt/C. Electrochemical impedance spectroscopy confirmed the faster kinetics of MOR and accelerated oxidation of adsorbed CO on the surface of the Pt/MWCNT/SS relative to the Pt/C.

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Facile preparation of ultra-low Pt loading graphene-immobilized electrode for methanol oxidation reaction

Cited by 12 publications

References 56 publications

Palladium Particles Modified by Mixed-Frequency Square-Wave Potential Treatment to Enhance Electrocatalytic Performance for Formic Acid Oxidation

Palladium Particles Modified by Mixed-Frequency Square-Wave Potential Treatment to Enhance Electrocatalytic Performance for Formic Acid Oxidation

Application of graphene inlow‐temperaturefuel cell technology: An overview

Two-Step Dry Synthesis of Binderless 3D Low Pt-Loading Electrocatalysts for Direct Alkaline Methanol Fuel Cell Anodes

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