The enhancement effect of nitrogen, fluorine-codoped titanium dioxide on the carbon supported platinum nano-catalyst for methanol electrooxidation reaction

Li, Guoqiang; Yao, Shikui; Zhu, Jianbing; Liu, Changpeng; Wang, Xing

doi:10.1016/j.jpowsour.2014.11.118

Cited by 17 publications

(3 citation statements)

References 48 publications

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“…The membrane electrode assemblies (MEAs) of recast Nafion and Nafion/SNPAEK- x composite membranes were fabricated by the hot-pressing method according to the procedures reported in the literature. , Pt–Ru/C and Pt/C catalyst were utilized as anode and cathode catalysts with catalyst loading of 4 mg cm –2 , respectively. The polarization curves of the passive direct methanol fuel cells (DMFCs) were obtained by using a Fuel Cell Test system (Arbin Instrument Corp. USA) at desired temperatures with an effective electrode area of 3 × 3 cm 2 .…”

Section: Methodsmentioning

confidence: 99%

Property Enhancement Effects of Side-Chain-Type Naphthalene-Based Sulfonated Poly(arylene ether ketone) on Nafion Composite Membranes for Direct Methanol Fuel Cells

Wang

Liang

et al. 2017

ACS Appl. Mater. Interfaces

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Nafion/SNPAEK-x composite membranes were prepared by blending raw Nafion and synthesized side-chain-type naphthalene-based sulfonated poly(arylene ether ketone) with a sulfonation degree of 1.35 (SNPAEK-1.35). The incorporation of SNPAEK-1.35 polymer with ion exchange capacity (IEC) of 2.01 mequiv·g into a Nafion matrix has the property enhancement effects, such as increasing IECs, improving proton conductivity, enhancing mechanical properties, reducing methanol crossover, and improving single cell performance of Nafion. Morphology studies show that Nafion/SNPAEK-x composite membranes exhibit a well-defined microphase separation structure depending on the contents of SNPAEK-1.35 polymer. Among them, Nafion/SNPAEK-7.5% with a bicontinuous morphology exhibits the best comprehensive properties. For example, it shows the highest proton conductivities of 0.092 S cm at 25 °C and 0.163 S cm at 80 °C, which are higher than those of recast Nafion with 0.073 S cm at 25 °C and 0.133 S cm at 80 °C, respectively. Nafion/SNPAEK-5.0% and Nafion/SNPAEK-7.5% membranes display an open circuit voltage of 0.77 V and a maximum power density of 47 mW cm at 80 °C, which are much higher than those of recast Nafion of 0.63 V and 24 mW cm under the same conditions. Nafion/SNPAEK-5.0% membrane also has comparable tensile strength (12.7 MPa) to recast Nafion (13.7 MPa), and higher Young's modulus (330 MPa) than that of recast Nafion (240 MPa). By combining their high proton conductivities, comparable mechanical properties, and good single cell performance, Nafion/SNPAEK-x composite membranes have the potential to be polymer electrolyte materials for direct methanol fuel cell applications.

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Section: Methodsmentioning

confidence: 99%

Property Enhancement Effects of Side-Chain-Type Naphthalene-Based Sulfonated Poly(arylene ether ketone) on Nafion Composite Membranes for Direct Methanol Fuel Cells

Wang

Liang

et al. 2017

ACS Appl. Mater. Interfaces

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“…Recently, the metal platinum (Pt)–oxide support interaction has been attracting much attention for maximization of activity on Pt/C in MEA. Both of anodic − and cathodic − electrocatalytic reactions on Pt-loaded CeO 2 , − ,− TiO 2 , − ,− SnO 2 , − ,− WO 3 , ,,, MoO 2 , …”

Section: Introductionmentioning

confidence: 99%

Active Pt-Nanocoated Layer with Pt–O–Ce Bonds on a CeO_x Nanowire Cathode Formed by Electron Beam Irradiation

et al. 2022

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A Pt-nanocoated layer (thickness of approx. 10–20 nm) with Pt–O–Ce bonds was created through the water radiolysis reaction on a CeO x nanowire (NW), which was induced by electron beam irradiation to the mixed suspension of K 2 PtCl 4 aqueous solution and the CeO x NW. In turn, when Pt-nanocoated CeO x NW/C (Pt/C ratio = 0.2) was used in the cathode layer of a membrane electrode assembly (MEA), both an improved fuel cell performance and stability were achieved. The fuel cell performance observed for the MEA using Pt-nanocoated CeO x NW/C with Pt–O–Ce bonds, which was prepared using the electron beam irradiation method, improved and maintained its performance (observed cell potential of approximately 0.8 V at 100 mW cm –2 ) from 30 to 140 h after the start of operation. In addition, the activation overpotential at 100 mA cm –2 (0.17 V) obtained for MEA using Pt-nanocoated CeO x NW/C was approximately half of the value at 100 mA cm –2 (0.35 V) of MEA using a standard Pt/C cathode. In contrast, the fuel cell performance (0.775 V at 100 mW cm –2 after 80 h of operation) of MEA using a nanosized Pt-loaded CeO x NW (Pt/C = 0.2), which was prepared using the conventional chemical reduction method, was lower than that of MEA using a Pt-nanocoated CeO x /C cathode and showed reduction after 80 h of operation. It is considered why the nanocoated layer having Pt–O–Ce bonds heterogeneously formed on the surface of the CeO x NW and the bare CeO 2 surface consisting of Ce 4+ cations would become unstable in an acidic atmosphere. Furthermore, when a conventional low-amount Pt/C cathode (Pt/C = 0.04) was used as the cathode layer of the MEA, its stable performance could not be measured after 80 h of operation as a result of flooding caused by a lowering of electrocatalytic activity on the Pt/C cathode in the MEA. In contrast, a low-amount Pt-nanocoated CeO x NW (Pt/C = 0.04) could maintain a low activation overpotential (0.22 V at 100 mA cm –2 ) of MEA at the same operation time. Our surface first-principles modeling indicates that the high quality and stable performance observed for the Pt-nanocoated CeO x NW cathode of MEA can be attributed to the formation of a homogeneous electric double layer on the sample. Since the MEA performance can be improved by examining a more effective method of electron beam irradiation to all surfaces of the sample, the present work result shows the usefulness of the electron beam irradiation method in preparing active surfaces. In addition, the quantum beam technology such as the electron beam irradiation method was sho...

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“…1,11 For a long time, it has been reported that Pt-based catalysts are the most favorable one towards organic molecules electro-oxidation such as urea. [12][13][14][15][16][17] Besides, Ni-based electrode catalysts appeared as promising anodes for enhanced electro-oxidation reaction of small organic molecules. [18][19][20][21][22] Moreover, Ni-based catalysts have been synthesized in various frameworks such as NPs, nanowires, nanorods, and 3-D networks.…”

mentioning

confidence: 99%

Enhanced Electrocatalytic Oxidation of Urea at CuOx-NiOx Nanoparticle-Based Binary Catalyst Modified Polyaniline/GC Electrodes

Goda

El-Moghny

El‐Deab

2020

J. Electrochem. Soc.

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In this study glassy carbon (GC) electrodes modified with electropolymerized polyaniline (PANI) are functionalized by the electrodeposition of copper oxide (CuOx) and nickel oxide (NiOx) nanoparticles (NPs). The proposed binary modified GC electrodes are suggested as effective and stable electrocatalysts towards urea oxidation reaction (UOR). The proposed electrodes were characterized using scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and mapping EDX. The electrochemical characterization, electrocatalytic activity, and catalyst’ durability of the as-prepared anodes were tested by linear sweep voltammetry (LSV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronoamperometry (CA). The loading of PANI and the catalyst’ deposition sequence were optimized. The modified electrode with PANI followed by electrodeposition of CuOx and NiOx showed higher electroactivity than without PANI, i.e., it increases by about four times for UOR simultaneously with a negative shift by 40 mV of the onset potential of UOR. Furthermore, the modified PANI fibers with electrodeposition of CuOx and NiOx, where CuOx is the top one, displayed the leading electrocatalytic stability and activity for UOR. The addressed electrode (NiOx/CuOx/PANI/GC) has a low cost, good selectivity and sensitivity, fast response, and high stability.

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The enhancement effect of nitrogen, fluorine-codoped titanium dioxide on the carbon supported platinum nano-catalyst for methanol electrooxidation reaction

Cited by 17 publications

References 48 publications

Property Enhancement Effects of Side-Chain-Type Naphthalene-Based Sulfonated Poly(arylene ether ketone) on Nafion Composite Membranes for Direct Methanol Fuel Cells

Property Enhancement Effects of Side-Chain-Type Naphthalene-Based Sulfonated Poly(arylene ether ketone) on Nafion Composite Membranes for Direct Methanol Fuel Cells

Active Pt-Nanocoated Layer with Pt–O–Ce Bonds on a CeO_x Nanowire Cathode Formed by Electron Beam Irradiation

Enhanced Electrocatalytic Oxidation of Urea at CuOx-NiOx Nanoparticle-Based Binary Catalyst Modified Polyaniline/GC Electrodes

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The enhancement effect of nitrogen, fluorine-codoped titanium dioxide on the carbon supported platinum nano-catalyst for methanol electrooxidation reaction

Cited by 17 publications

References 48 publications

Property Enhancement Effects of Side-Chain-Type Naphthalene-Based Sulfonated Poly(arylene ether ketone) on Nafion Composite Membranes for Direct Methanol Fuel Cells

Property Enhancement Effects of Side-Chain-Type Naphthalene-Based Sulfonated Poly(arylene ether ketone) on Nafion Composite Membranes for Direct Methanol Fuel Cells

Active Pt-Nanocoated Layer with Pt–O–Ce Bonds on a CeOx Nanowire Cathode Formed by Electron Beam Irradiation

Enhanced Electrocatalytic Oxidation of Urea at CuOx-NiOx Nanoparticle-Based Binary Catalyst Modified Polyaniline/GC Electrodes

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Active Pt-Nanocoated Layer with Pt–O–Ce Bonds on a CeO_x Nanowire Cathode Formed by Electron Beam Irradiation