Electrocatalytic properties improvement on carbon-nanotubes coated reaction surface for micro-DMFC

Wang, Shou-Kai; Tseng, Fan‐Gang; Yeh, Tsung‐Kuang; Chieng, Ching-Chang

doi:10.1016/j.jpowsour.2007.02.057

Cited by 18 publications

(4 citation statements)

References 22 publications

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“…In recent years, carbon nanotube providing a novel nano-structure with large specific surface area and good chemical resistance has been widely used in many applications. Most of the CNTs are directly grown on carbon cloth [1,2], on the silicon [3], or on the graphite substrate [4] as the catalyst supports. However, the CNT must adopt the hydrophilic treatment due to its instinct hydrophobic property prior to depositing the catalyst.…”

Section: Introductionmentioning

confidence: 99%

High efficient nanocatalysts synthesis by a semi-reflux chemical reduction system

Gong

Wang

et al. 2010

2010 IEEE 5th International Conference on Nano/Micro Engineered and Molecular Systems

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Pt is one of the most employed catalysts for methanol catalysis in direct methanol fuel cell (DMFC). In this study, carbon nanotube (CNT) surface was used for catalyst reduction. By using ethylene glycol as a reducing agent, Pt catalyst precursor (H 2 PtCl 6 6H 2 O) was reduced on the CNTs by a novel method called semi-reflux chemical reduction system (SRCRS). The SRCRS can effectively reduce the catalyst preparation time and the catalyst distribution density can also be much increased by adjusting the pH value. Cyclic voltammetry (CV) and ICP-MS results were used for electrochemical surface area (ECA) calculation. The ECA result was comparable to that of commercial available Pt.

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Section: Introductionmentioning

confidence: 99%

High efficient nanocatalysts synthesis by a semi-reflux chemical reduction system

Gong

Wang

et al. 2010

2010 IEEE 5th International Conference on Nano/Micro Engineered and Molecular Systems

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“…All of the electrochemical tests were performed in a standard three-electrode system on an electrochemical workstation (Model 760B, CH Instruments, Inc., USA) at room temperature (25 • C). 35,36 To prepare the working electrodes, the geometric reaction area of the fabricated electrodes was defined as 1 cm 2 (1 cm × 1 cm), and acid electroforming tape (my15mm, Blue Giant Inc., Taiwan) was used to protect the border during the electrochemical measurements. A Pt-coated Ti mesh and saturated calomel electrode (SCE) were used as the counter and reference electrode, respectively.…”

Section: Methodsmentioning

confidence: 99%

Thickness Control over Ionomer Coatings on Nano Patterned Three-Phase Zones for a Highly Efficient Electrode

Yeh

et al. 2012

J. Electrochem. Soc.

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In the present study, a carbon nanotube supported platinum (Pt/CNT) electrode with a thin and uniform ionomer layer as the proton-conducting electrolyte on a nano patterned three-phase zone (TPZ) was fabricated, aiming at high electrocatalytic activity and high charge transfer rate for methanol oxidation reaction (MOR). Unlike conventional paste or spray methods that produced thick and non-uniform ionomer layers to form TPZs within the catalyst layers (50-100 μm) of electrodes, thin and uniform ionomer layers (5-10 nm) on the hydrophilic-treated Pt/CNT catalyst electrodes (8 μm) were harvested by spin-coating. The thickness of the ionomer layer was controlled by altering the spin-coating speed, and the effect of the ionomer thickness on the surface of the catalyst layer and on the electrochemical properties of the electrodes for MOR was studied (mass activity, MA and charge transfer resistance, Rct). Compared to the electrode fabricated by spraying (MA: 355 A g −1 , Rct: 48 cm 2 ), the ionomer-coated electrode spin-coated at 4000 rpm exhibited superior properties for MOR (MA: 381 A g −1 , Rct: 15 cm 2 ). The outcome renders this new electrode to embrace potential applications in micro direct methanol fuel cells (μDMFCs) with the design of a thin and uniform TPZ.

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“…The working principle is to impose a variable voltage at the working electrode (WE) and analyze the current signal received with time to determine the oxidation-reduction (redox) status in the electrochemical reaction. In this case, we imposed time-varying triangular wave of potential in the WE, and then observed the relationship between potential (E, V SCE ) and current density (I, mA/cm 2 ) to realize the potential for the redox reaction, electrochemical mass activity (MA, A/g Pt ) and reaction rate [1,9]. In the CV curves, we can also obtain the active electrochemical surface area (ESA) of Pt catalysts from the hydrogen ion electrosorption reactions (charge transfer density of H + , Q H , mC/cm 2 ) in a H 2 SO 4 aqueous solution.…”

Section: Electrochemical Performance Testmentioning

confidence: 99%

Enhancement of catalytic efficiency by partial replacement of ruthenium with platinum nanoparticles for direct methanol fuel cell

Chang

Lin

et al. 2014

The 9th IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS)

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In this paper, an open-loop reduction system (OLRS)[1] is employed to produce the core-shell Pt (platinum)/Ru (ruthenium) catalysts on the carbon nanotube/carbon fiber supports (CNT/CF) for direct methanol fuel cell (DMFC) application. By adjusting pH value of the ionized reduction environment, Pt 4+ can be first converted into Pt 2+ to allow partial Ru replacement with Pt by redox transmetalation and produce Pt/Ru core-shell nano structures [2,3]. Methanol oxidation efficiency and carbon monoxide (CO) poisoning tolerance of the prepared core-shell nano catalysts can be greatly enhanced by our developed OLRS compared to conventional reflux system [4].

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Electrocatalytic properties improvement on carbon-nanotubes coated reaction surface for micro-DMFC

Cited by 18 publications

References 22 publications

High efficient nanocatalysts synthesis by a semi-reflux chemical reduction system

High efficient nanocatalysts synthesis by a semi-reflux chemical reduction system

Thickness Control over Ionomer Coatings on Nano Patterned Three-Phase Zones for a Highly Efficient Electrode

Enhancement of catalytic efficiency by partial replacement of ruthenium with platinum nanoparticles for direct methanol fuel cell

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