A novel non-precious metal catalyst synthesized via pyrolysis of polyaniline-coated tungsten carbide particles for oxygen reduction reaction

Jiang, Kezhu; Jia, Qingmin; Xu, Mingli; Wu, Daping; Yang, Lunquan; Yang, Guotao; Chen, Linyan; Wang, Guanghua; Yang, Xianfeng

doi:10.1016/j.jpowsour.2012.07.056

Cited by 16 publications

(9 citation statements)

References 28 publications

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“…Recently, to solve the electrochemical activity limitation of tungsten carbide in the ORR, there has been a lot of work on controlling the specific surface area, the deposition of noble metals on tungsten carbides, and tungsten carbide-based composite nanostructures. [39][40][41][42][43] Here, we prepared iron-nitrogen-doped well-defined mesoporous tungsten carbides as cathode catalysts by means of a template-free synthesis. The iron-nitrogen-doped well-defined mesoporous tungsten carbides were characterized by field-emission scanning electron microscopy (FE-SEM), field-emission transmission electron microscopy (FE-TEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Iron–nitrogen-doped mesoporous tungsten carbide nanostructures as oxygen reduction electrocatalysts

Moon

Lee

Han

et al. 2014

Phys. Chem. Chem. Phys.

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Since Pt-based catalysts have the disadvantages of high cost, large overpotential loss, and limited long-term stability, there have been various promising alternatives to Pt-based catalysts to improve the catalytic activity towards the oxygen reduction reaction (ORR). We have synthesized iron-nitrogen-doped mesoporous tungsten carbide catalysts (WC-m-FT) by pyrolysis of well-ordered mesoporous tungsten carbides with iron porphyrin. WC-m-FT exhibits excellent ORR catalytic activity in an alkaline medium, i.e. a high electron-transfer number as well as superior stability and methanol tolerance. The improved activity and stability of WC-m-FT are ascribed to iron-containing catalytic active sites surrounded by nitrogen species and the well-defined mesoporous tungsten carbide structure.

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Section: Introductionmentioning

confidence: 99%

Iron–nitrogen-doped mesoporous tungsten carbide nanostructures as oxygen reduction electrocatalysts

Moon

Lee

Han

et al. 2014

Phys. Chem. Chem. Phys.

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“…Considering WC and MoC, it is often observed that they do present activity for several reactions, such as hydrogenation, dehydrogenation, hydrocarbon isomerization and hydrogen evolution ,,,. However, neither pure WC or MoC are much active for the ORR acid medium, but when mixed with carbon and used to support Pt nanoparticles they are found to generate more stable and active catalysts for the oxygen reduction reaction than Pt supported on C, as in the case of Pt‐WC/C . Generally, it is suggested that WC may act as a promoter that increase the electrocatalytic activity of Pt, Pd and other catalyst alloys for the alcohol oxidation, oxygen reduction and the hydrogen evolution reactions due to a synergistic effect between the components of the materials .…”

Section: Introductionmentioning

confidence: 99%

Activity and Electrochemical Stability of Pt‐ and Pt₂Ni‐α‐WC/C Catalysts for the Oxygen Reduction Reaction in Acid Media

Bott‐Neto¹,

Ticianelli²

2018

ChemElectroChem

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The activity and electrochemical stability of Pt and Pt2Ni alloy nanoparticles supported on carbon (Pt/C, Pt2Ni/C) or on hexagonal tungsten carbide/carbon powders (Pt‐α‐WC/C, Pt2Ni‐α‐WC/C) were investigated for the oxygen reduction reaction (ORR) in 0.1 M HClO4. The composites were extensively characterized by different physicochemical techniques, after which the electrochemical active surface area and the electrocatalytic activity for ORR were investigated, before and after being submitted to accelerated stress tests (AST). Results of rotating ring‐disk electrode experiments have indicated that Pt2Ni‐α‐WC 20 wt.%/C presents the highest initial specific activity (SA) for ORR, about 1.8 times higher than that of a Pt/C catalyst, but also the largest loss of specific activity caused by the AST. This is assigned to a strong catalyst degradation and consequent elimination of positive effects of Ni over Pt in the electrocatalysis of ORR. Although the mass activity of Pt/C electrode was higher after 12000 AST cycles, the specific activity of Pt‐α‐WC20 wt.%/C is more stable, indicating that beneficial interactions between Pt and the WC/WOx phases are maintained along the AST.

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“…However, its high price resulting from Pt loading in electrocatalysts, low catalytic activities towards ORR, and insufficient durability are major obstacles for DMFC commercialization. 4,5 In particular, the ORR process has two pathways: an efficient four-electron (4e À ) reduction that forms water (H 2 O) and an inefficient two-electron (2e À ) reduction with hydrogen peroxide (H 2 O 2 ) as an intermediate. 6 The sluggish kinetics requires large quantities of Pt-based catalysts, and the methanol crossover effect of the ORR catalyst at the cathode are major concerns in largescale application of DMFC.…”

Section: Introductionmentioning

confidence: 99%

Efficient synthesis of nitrogen-doped carbon with flower-like tungsten nitride nanosheets for improving the oxygen reduction reactions

et al. 2017

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A novel three-dimensional (3D) electrocatalyst composite was successfully prepared through a facile hydrothermal method, consisting of tungsten nitride nanosheets with flower-like morphology (WN FNs) and nitrogen-doped carbon black (N-C). Highly crystalline WN FNs were observed to be uniformly distributed in N-C, and remarkably promoted the catalytic activities toward oxygen reduction reaction (ORR) of the N-C. Moreover, the electrochemical results proved that, WN FNs/N-C composite shows a significantly higher ORR activity with a 4-electron transfer pathway and limiting current density of 5.8 mA cm À2 in alkaline solutions. The stability test of the nanocomposite showed less degradation after 5 h and its methanol tolerance also was enhanced compared with Pt/C. The improved performance of the WN FNs/N-C composite can be attributed to its unique configuration and the increased exposure of active sites, which suggests that it could serve as an ideal candidate for developing high performance ORR catalysts.

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A novel non-precious metal catalyst synthesized via pyrolysis of polyaniline-coated tungsten carbide particles for oxygen reduction reaction

Cited by 16 publications

References 28 publications

Iron–nitrogen-doped mesoporous tungsten carbide nanostructures as oxygen reduction electrocatalysts

Iron–nitrogen-doped mesoporous tungsten carbide nanostructures as oxygen reduction electrocatalysts

Activity and Electrochemical Stability of Pt‐ and Pt₂Ni‐α‐WC/C Catalysts for the Oxygen Reduction Reaction in Acid Media

Efficient synthesis of nitrogen-doped carbon with flower-like tungsten nitride nanosheets for improving the oxygen reduction reactions

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A novel non-precious metal catalyst synthesized via pyrolysis of polyaniline-coated tungsten carbide particles for oxygen reduction reaction

Cited by 16 publications

References 28 publications

Iron–nitrogen-doped mesoporous tungsten carbide nanostructures as oxygen reduction electrocatalysts

Iron–nitrogen-doped mesoporous tungsten carbide nanostructures as oxygen reduction electrocatalysts

Activity and Electrochemical Stability of Pt‐ and Pt2Ni‐α‐WC/C Catalysts for the Oxygen Reduction Reaction in Acid Media

Efficient synthesis of nitrogen-doped carbon with flower-like tungsten nitride nanosheets for improving the oxygen reduction reactions

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Activity and Electrochemical Stability of Pt‐ and Pt₂Ni‐α‐WC/C Catalysts for the Oxygen Reduction Reaction in Acid Media