Templated bi-metallic non-PGM catalysts for oxygen reduction

Serov, Alexey; Robson, Michael H.; Smolnik, Mayat; Atanassov, Plamen

doi:10.1016/j.electacta.2012.07.008

Cited by 80 publications

(82 citation statements)

References 72 publications

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“…It has also been shown that varying the melamine/resorcinol ratio in the synthesis of aerogels enables one to adjust the microstructure of the materials [60]. Highly active porous carbon catalysts for ORR have been synthesised by pyrolysis of metal salts and poly(ethyleneimine) [24], 4-aminoantipyrine [25][26][27][28] or cyanamide [29] as precursors, while using the silica template as sacrificial support enabled to achieve a determined pore structure.…”

Section: Introductionmentioning

confidence: 98%

Cobalt- and iron-containing nitrogen-doped carbon aerogels as non-precious metal catalysts for electrochemical reduction of oxygen

Sarapuu

Samolberg

Kreek

et al. 2015

Journal of Electroanalytical Chemistry

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Section: Introductionmentioning

confidence: 98%

Cobalt- and iron-containing nitrogen-doped carbon aerogels as non-precious metal catalysts for electrochemical reduction of oxygen

Sarapuu

Samolberg

Kreek

et al. 2015

Journal of Electroanalytical Chemistry

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“…These include (1) reactive polymer approach (such as those using polyaniline 9 or polyethylenimine 13 ), (2) small chelating compounds (i.e., pyridine, 14 aminoantipyrine, 15−19 phenanthroline 20 ), or (3) active-nitrogen carrying gas molecules such as ammonia. 20 Each of these approaches has shown very promising activity for ORR.…”

Section: Introductionmentioning

confidence: 99%

Elucidating Oxygen Reduction Active Sites in Pyrolyzed Metal–Nitrogen Coordinated Non-Precious-Metal Electrocatalyst Systems

et al. 2014

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Detailed understanding of the nature of the active centers in non-precious-metal-based electrocatalyst, and their role in oxygen reduction reaction (ORR) mechanistic pathways will have a profound effect on successful commercialization of emission-free energy devices such as fuel cells. Recently, using pyrolyzed model structures of iron porphyrins, we have demonstrated that a covalent integration of the Fe–Nx sites into π-conjugated carbon basal plane modifies electron donating/withdrawing capability of the carbonaceous ligand, consequently improving ORR activity. Here, we employ a combination of in situ X-ray spectroscopy and electrochemical methods to identify the various structural and functional forms of the active centers in non-heme Fe/N/C catalysts. Both methods corroboratively confirm the single site 2e– × 2e– mechanism in alkaline media on the primary Fe2+–N4 centers and the dual-site 2e– × 2e– mechanism in acid media with the significant role of the surface bound coexisting Fe/FexOy nanoparticles (NPs) as the secondary active sites.

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“…The bimetallic catalysts were synthesized with the main purpose of switching the electron transfer from a 2x2e − as previously measured for monometallic catalysts [87] to a practical 4e − mechanism and further enhance the electrocatalytic activity towards ORR in neutral media. It was previously shown in acidic media that the addition of Mn enhanced the ORR performances of the catalyst and lower significantly the H 2 O 2 produced [89], [90]. All the catalysts were synthesized using as procedure the sacrificial support method (SSM).…”

Section: Introductionmentioning

confidence: 99%

Bimetallic platinum group metal-free catalysts for high power generating microbial fuel cells

Kodali

Santoro

Herrera

et al. 2017

Journal of Power Sources

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M1-M2-N-C bimetallic catalysts with M1 as Fe and Co and M2 as Fe, Co, Ni and Mn were synthesized and investigated as cathode catalysts for oxygen reduction reaction (ORR). The catalysts were prepared by Sacrificial Support Method in which silica was the template and aminoantipyrine (AAPyr) was the organic precursor. The electro-catalytic properties of these catalysts were investigated by using rotating ring disk (RRDE) electrode setup in neutral electrolyte. Fe-Mn-AAPyr outperformed Fe-AAPyr that showed higher performances compared to Fe-Co-AAPyr and Fe-Ni-AAPyr in terms of half-wave potential. In parallel, Fe-Co-AAPyr, Co-Mn-AAPyr and Co-Ni-AAPyr outperformed Co-AAPyr. The presence of Co within the catalyst contributed to high peroxide production not desired for efficient ORR. The catalytic capability of the catalysts integrated in air-breathing cathode was also verified. It was found that Co-based catalysts showed an improvement in performance by the addition of second metal compared to simple Co- AAPyr. Fe-based bimetallic materials didn't show improvement compared to Fe-AAPyr with the exception of Fe-Mn-AAPyr catalyst that had the highest performance recorded in this study with maximum power density of 221.8 ± 6.6 μWcm−2. Activated carbon (AC) was used as control and had the lowest performances in RRDE and achieved only 95.6 ± 5.8 μWcm−2 when tested in MFC.

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Templated bi-metallic non-PGM catalysts for oxygen reduction

Cited by 80 publications

References 72 publications

Cobalt- and iron-containing nitrogen-doped carbon aerogels as non-precious metal catalysts for electrochemical reduction of oxygen

Cobalt- and iron-containing nitrogen-doped carbon aerogels as non-precious metal catalysts for electrochemical reduction of oxygen

Elucidating Oxygen Reduction Active Sites in Pyrolyzed Metal–Nitrogen Coordinated Non-Precious-Metal Electrocatalyst Systems

Bimetallic platinum group metal-free catalysts for high power generating microbial fuel cells

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