CoSe nanoparticles prepared by the microwave-assisted polyol method as an alcohol and formic acid tolerant oxygen reduction catalyst

Nekooi, Parisa; Akbari, Marzieh; Amini, Mohammad K.

doi:10.1016/j.ijhydene.2010.03.134

Cited by 78 publications

(35 citation statements)

References 45 publications

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“…27 However, the formic acid crossover still significantly limits the performance of DFAFCs. 3,[29][30][31] Formic acid tolerance was measured using Pt and Ru x Se y deposited onto the oxide-carbon composite substrate (TiO 2 /C) in the study conducted by L. Timperman et al 31 The formic acid tolerance was better in the Ru x Se y /C catalyst when compared with that in the Ru x Se y /TiO 2 /C catalyst. 3,[29][30][31] Formic acid tolerance was measured using Pt and Ru x Se y deposited onto the oxide-carbon composite substrate (TiO 2 /C) in the study conducted by L. Timperman et al 31 The formic acid tolerance was better in the Ru x Se y /C catalyst when compared with that in the Ru x Se y /TiO 2 /C catalyst.…”

Section: Introductionmentioning

confidence: 99%

Performance of direct formic acid fuel cell using transition metal‐nitrogen‐doped carbon nanotubes as cathode catalysts

et al. 2019

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Summary The application of nonprecious metal catalysts, such as iron (Fe) and cobalt (Co) catalyst, to direct liquid fuel cells (DLFCs), especially in direct methanol fuel cells, has been widely investigated. However, the application of such non‐Pt catalysts as cathode catalysts in direct formic acid fuel cell (DFAFC) operations has not yet been investigated. This study intends to evaluate the formic acid tolerance of such catalysts in case of oxygen reduction reaction. In addition, we investigate their performances in DFAFC using the Fe‐ and Co‐nitrogen‐doped carbon nanotubes (Fe‐NCNT and Co‐NCNT) as the cathode catalysts and compare these performances with the commercial Pt/C catalyst. Herein, Fe‐NCNT and Co‐NCNT were synthesized using the conventional method by the pyrolysis of the multiwalled carbon nanotubes, dicyandiamide, and metal salt under the flow of N2 at 800°C. Both the Fe‐NCNT and Co‐NCNT catalysts exhibit higher formic acid tolerance when compared with that exhibited by the Pt/C catalyst. Further, single‐cell tests with hydrogen‐fed polymer electrolyte fuel cell (PEFC) and DFAFC operations were conducted under various operating conditions to compare the performances of the cells while using the prepared catalysts and the conventional Pt/C catalyst. The PEFC performances in both the Fe‐NCNT and Co‐NCNT catalysts were significantly low (94.9mW cm−2 for Fe‐NCNT and 164.0 mW cm−2 for Co‐NCNT at 60°C). Regardless, the Co‐NCNT catalyst exhibited a maximum power density of 160.7 mW cm−2 in DFAFC operated at 60°C and7‐M formic acid. This value is comparable with that for DFAFC with a Pt/C catalyst (128.9mW cm−2) and is considerably higher than that obtained for other DLFCs while using a non‐Pt catalyst. Therefore, the usage of a non‐Pt metal catalyst as the cathode catalyst is preferable in case of DFAFC.

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Section: Introductionmentioning

confidence: 99%

Performance of direct formic acid fuel cell using transition metal‐nitrogen‐doped carbon nanotubes as cathode catalysts

et al. 2019

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“…These three emerging technologies rely on a common reaction, the oxygen reduction reaction (ORR), which generally requires a catalyst to improve its sluggish reaction kinetics. Fe and Co) have been extensively investigated, including transition metal oxides, 15,16 chalcogenides, 17,18 and bio-inspired organometallic complexes. However, the scarcity, high cost, and vulnerability to poisoning of Pt have strongly hindered the practical application of Pt-based catalysts.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a conjugated porous Co(ii) porphyrinylene–ethynylene framework through alkyne metathesis and its catalytic activity study

et al. 2015

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The development of efficient catalysts for the oxygen reduction reaction (ORR) is crucial for a number of emerging technologies, to counter energy and environment crises. Herein, we report an alkyne metathesis polymerization protocol to synthesize a conjugated microporous metalloporphyrin-based framework containing interconnected ORR catalytic centers. A simple composite of the framework and carbon black shows excellent ORR electrocatalytic activity and specificity through a four-electron reduction mechanism under both acidic and alkaline conditions. The pyrolysis of the catalyst, which is commonly involved in the preparation of ORR catalytic systems, is not necessary. Compared to monomeric metalloporphyrins, the framework shows enhanced ORR catalytic activity, presumably due to the porous and conjugated nature of the framework structure, which allows better exposure of the catalytically active sites, and efficient electron/mass transport. More importantly, the composite electrocatalyst exhibits superior durability and methanol tolerance over commercial Pt/C and metalloporphyrin monomers. Given the highly structural tunability of conjugated microporous polymers, it is conceivable that such a non-pyrolytic approach could enable the systematic exploration of the structure-activity relationship of organic framework-based ORR catalysts and eventually lead to the development of cost-effective replacements for Pt/C.

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“…The onset potential of 0.823 V for ORR could be attained in H2SO4 solutions with CoSe/C synthesized through microwave assisted routes [16], while the ORR potentials of 0.6-0.7 V and the electron transfer numbers of 3.1 Oxygen reduction reaction 4.0 could be obtained for CoSe2/C prepared with the Se/Co ratios of 2.5-4.0 [17]. In addition, CoSe2 nanoparticles showed a higher ORR activity in KOH than in H2SO4 solutions and a higher tolerance to methanol as compared with a commercial 20 wt % Pt/C catalyst [18].…”

Section: Introductionmentioning

confidence: 99%

Microwave Synthesis of High Activity FeSe2/C Catalyst toward Oxygen Reduction Reaction

Zheng

Cheng

2015

Catalysts

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Abstract:The carbon supported iron selenide catalysts (FeSe2/C) were prepared with various selenium to iron ratios (Se/Fe), namely, Se/Fe = 2.0, 2.5, 3.0, 3.5 and 4.0, through facile microwave route by using ferrous oxalate (FeC2O4·2H2O) and selenium dioxide (SeO2) as precursors. Accordingly, effects of Se/Fe ratio on the crystal structure, crystallite size, microstructure, surface composition and electrocatalytic activity for oxygen reduction reaction (ORR) of FeSe2/C in an alkaline medium were systematically investigated. The results revealed that all the FeSe2/C catalysts obtained with the Se/Fe ratios of 2.0-4.0 exhibited almost pure orthogonal FeSe2 structure with the estimated mean crystallite sizes of 32.9-36.2 nm. The electrocatalytic activities in potassium hydroxide solutions were higher than those in perchloric acid solutions, and two peak potentials or two plateaus responded to ORR were observed from cyclic voltammograms and polarization curves, respectively. The ORR potentials of 0.781-0.814 V with the electron transfer numbers of 3.3-3.9 at 0.3 V could be achieved as the Se/Fe ratios varied from 2.0 to 4.0. The Fe and Se were presented at the surface of FeSe2/C upon further reduction on FeSe2. The Se/Fe ratios slightly influenced the degree of graphitization in carbon support and the amount of active sites for ORR. OPEN ACCESSCatalysts 2015, 5 1080

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CoSe nanoparticles prepared by the microwave-assisted polyol method as an alcohol and formic acid tolerant oxygen reduction catalyst

Cited by 78 publications

References 45 publications

Performance of direct formic acid fuel cell using transition metal‐nitrogen‐doped carbon nanotubes as cathode catalysts

Performance of direct formic acid fuel cell using transition metal‐nitrogen‐doped carbon nanotubes as cathode catalysts

Synthesis of a conjugated porous Co(ii) porphyrinylene–ethynylene framework through alkyne metathesis and its catalytic activity study

Microwave Synthesis of High Activity FeSe2/C Catalyst toward Oxygen Reduction Reaction

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