Organic dyes in laser technology

Schäfer, F. P.

doi:10.1007/bfb0046056

Cited by 9 publications

(3 citation statements)

References 62 publications

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“…Among several desirable characteristics, high active site density, stability in electrolyte/oxygen and peroxide, reusability, and low overpotential relative to the thermodynamic of 4e – oxygen-to-water reduction potential of 1.23 eV are very impotent for effective ORR catalysts. It has been shown that transition-metal-, nitrogen-, and carbon-containing compounds having an M–N x structural motif can act as an effective ORR catalyst, where M is nonplatinum metal, and in most of the cases, it is Fe or Co or Cu or Ni, which is chelated with nitrogen atoms of the ligand. − The structure with an M–N x motif exhibits good ORR activity but suffers difficulty in terms of stability in various electrolytes. Thermal treatment can get rid of this stability issue, but it introduced new challenges to find out catalytic active sites, which are essential for catalyst optimization and mechanistic understanding.…”

Section: Introductionmentioning

confidence: 99%

Cobalt-Based Coordination Polymer for Oxygen Reduction Reaction

et al. 2018

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Lack of control over the structure and electrically nonconductive properties of coordination polymers (CPs) creates a major hindrance to designing an active electrocatalyst for oxygen reduction reaction (ORR). Here, we report a new semiconductive and low-optical band gap CP structure [{Co 3 (μ 3 -OH)(BTB) 2 (BPE) 2 }{Co 0.5 N(C 5 H 5 )}], 1 , that exhibits high-performance ORR in alkaline medium. The electrical conductivity of compound 1 was measured using impedance spectroscopy and found to be 5 × 10 –4 S cm –1 . The Ketjenblack EC-600JD carbon used as a support for all the electrochemical methods such as cyclic voltammetry, rotating disk electrode, rotating ring-disk electrode and Koutecký–Levich analysis. The as-synthesized Co-based catalyst has the ability to reduce O 2 to H 2 O by a nearly four-electron process. The crystal structure of 1 shows that the trimeric unit {Co 3 (μ 3 -OH)(COO) 5 N 3 } and monomeric unit {Co(COO) 2 (NC 5 H 4 ) 2 } 2+ are linked with BTB and BPE linkers to form a three-dimensional structure. Theoretical calculations predict that the monomeric center acts as an active catalytic site for ORR. This could be due to the efficient overlap of highest occupied molecular orbital–lowest unoccupied molecular orbital between monomer and O 2 molecule. This CP, 1 , shows facile 3.6-electron ORR, and it is inexpensive compared with widely used Pt catalysts. Therefore, this CP can be used as a promising cathode material for fuel cells in terms of efficiency and cost effectiveness.

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Section: Introductionmentioning

confidence: 99%

Cobalt-Based Coordination Polymer for Oxygen Reduction Reaction

et al. 2018

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“…These structures were popularized after the 1964 report by Jasinski 1 that detailed the high ORR activity of cobalt phthalocyanine complexes blended with electrically conductive acetylene black. The ability for oxygen to chemisorb onto these M-N x sites without degrading the material fuelled extensive investigations of ORR on M-N x -containing catalysts 2 3 4 5 . Though active towards ORR, M-N x complexes have shown inconsistent stability in various electrolytes, motivating high-temperature treatment of the materials to enhance catalyst longevity and electrical conductivity 3 5 .…”

mentioning

confidence: 99%

“…The ability for oxygen to chemisorb onto these M-N x sites without degrading the material fuelled extensive investigations of ORR on M-N x -containing catalysts 2 3 4 5 . Though active towards ORR, M-N x complexes have shown inconsistent stability in various electrolytes, motivating high-temperature treatment of the materials to enhance catalyst longevity and electrical conductivity 3 5 . Thermal treatment indeed increased the stability of the materials, but introduced new challenges in maintaining synthetic control over structure formation, identifying the catalytic active sites, and establishing structure–function relationships useful for catalyst optimization and mechanistic understanding.…”

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confidence: 99%

Electrochemical oxygen reduction catalysed by Ni3(hexaiminotriphenylene)2

Miner¹,

Fukushima²,

Sheberla³

et al. 2016

Nat Commun

638

517

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Control over the architectural and electronic properties of heterogeneous catalysts poses a major obstacle in the targeted design of active and stable non-platinum group metal electrocatalysts for the oxygen reduction reaction. Here we introduce Ni3(HITP)2 (HITP=2, 3, 6, 7, 10, 11-hexaiminotriphenylene) as an intrinsically conductive metal-organic framework which functions as a well-defined, tunable oxygen reduction electrocatalyst in alkaline solution. Ni3(HITP)2 exhibits oxygen reduction activity competitive with the most active non-platinum group metal electrocatalysts and stability during extended polarization. The square planar Ni-N4 sites are structurally reminiscent of the highly active and widely studied non-platinum group metal electrocatalysts containing M-N4 units. Ni3(HITP)2 and analogues thereof combine the high crystallinity of metal-organic frameworks, the physical durability and electrical conductivity of graphitic materials, and the diverse yet well-controlled synthetic accessibility of molecular species. Such properties may enable the targeted synthesis and systematic optimization of oxygen reduction electrocatalysts as components of fuel cells and electrolysers for renewable energy applications.

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Syntheses and Properties of Cyanine and Related Dyes

Sturmer

1977

Chemistry of Heterocyclic Compounds: A Series of Monographs

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Organic dyes in laser technology

Cited by 9 publications

References 62 publications

Cobalt-Based Coordination Polymer for Oxygen Reduction Reaction

Cobalt-Based Coordination Polymer for Oxygen Reduction Reaction

Electrochemical oxygen reduction catalysed by Ni3(hexaiminotriphenylene)2

Syntheses and Properties of Cyanine and Related Dyes

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