Supramolecular Porphyrins as Electrocatalysts

Araki, Koji; Toma, Henrique E.

doi:10.1007/978-0-387-28430-9_6

Cited by 12 publications

(11 citation statements)

References 169 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Rotating electrode voltammetry [Bard and Faulkner, 2001;Opekar and Beran, 1976], which is a forced convection/hydrodynamic method, allows one to quantify k and n av as functions of the electrochemical potential by using an appropriate mathematical model to relate the observed catalytic currents to the rates of chemical reactions and mass transport processes. A general description of electrochemical kinetics at a chemically modified electrode was developed by Saveant and co-workers [Andrieux and Saveant, 1992].…”

Section: Experimental Approaches To Studying Orr Catalysismentioning

confidence: 99%

“…18.12) . Since their invention by Anson in the early 1990s, many Co porphyrins derivatized peripherally with metal complexes have been reported [Araki and Toma, 2006;Gadamsetti and Swavey, 2006]. Some of these catalysts manifest high selectivity for the four-electron pathway, albeit within a limited pH range [Araki and Toma, 2006].…”

Section: Simple Co Porphyrins and Anson Catalystsmentioning

confidence: 99%

“…Since their invention by Anson in the early 1990s, many Co porphyrins derivatized peripherally with metal complexes have been reported [Araki and Toma, 2006;Gadamsetti and Swavey, 2006]. Some of these catalysts manifest high selectivity for the four-electron pathway, albeit within a limited pH range [Araki and Toma, 2006]. In the original work, Co tetra-pyridylporphyrin was adsorbed on a graphite electrode and this modified electrode was exposed to a solution of [Ru(NH 3 ) 5 (OH 2 )] 2þ , in which only the aqua ligand is labile and Ru II has a higher affinity to pyridine than to H 2 O.…”

Section: Simple Co Porphyrins and Anson Catalystsmentioning

confidence: 99%

“…18.7a) [ Bard and Faulkner, 2001;Opekar and Beran, 1976]. In this setup, the ring electrode serves as an electrochemical sensor of partially reduced oxygen species (H 2 O 2 and O 2 2 /HO 2 ) released by the catalytic film at the disk.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Metalloporphyrin Catalysts of Oxygen Reduction

Boulatov

2008

Fuel Cell Catalysis

View full text Add to dashboard Cite

Section: Experimental Approaches To Studying Orr Catalysismentioning

confidence: 99%

Section: Simple Co Porphyrins and Anson Catalystsmentioning

confidence: 99%

Section: Simple Co Porphyrins and Anson Catalystsmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Metalloporphyrin Catalysts of Oxygen Reduction

Boulatov

2008

Fuel Cell Catalysis

View full text Add to dashboard Cite

“…Tais características não podem ser encontradas em catalisadores porfirínicos convencionais, evidenciando as vantagens das supermoléculas e sistemas supramoleculares baseados em com- postos de coordenação. Finalmente, vale ressaltar que os catalisadores se ajustam espontaneamente às condições do meio, de modo a maximizar a atividade catalítica tanto para oxidação como para redução, tornando-os "inteligentes" 59 .…”

Section: Porfirina Cluster Como Modelo De Citocromo P-450unclassified

Estratégia supramolecular para a nanotecnologia

Araki¹

2007

Quím. Nova

Self Cite

View full text Add to dashboard Cite

SUPRAMOLECULAR APPROACH TO NANOTECHNOLOGY. Brazilian science is evolving rapidly and steadly in the last 10 years, reaching the 15º place in the international ranking. Research in nanotechnology is following a similar way generating new scientific and technological knowledge in several frontiers but specially in the interfaces of two or more areas, where Chemistry is consolidating itself as a central science. In this context, the supramolecular approach is a very promissing one because it allows the build-up of a chemical inteligence using all the sistematized knowledge for the design and development of new nanomaterials and products. The great challenge of Chemistry is not decrease the dimensionality of the materials but instead find ways to increase the dimensionality and structural complexity keeping strict control on the interactions between the components, in order to generate materials with new properties and functionalities. Unfortunately, the current vigorous advancement of scientific research has not been followed by the transformation of such knowhow into patents and produts. Therefore much efforts should be devoted to build a national science and technology program, joining all the segments of the society involved in the technological development (university, institutes of technological research, industry and government) in order to promote the furtherance of the Brazilian technological base. Only in this way it is possible to evolve to a technological society capable to transform the scientific knowledge into wealthy, thus sustaining the socioeconomic development of the country.Keywords: nanotechnology; supramolecular approach; nanomaterials. INTRODUÇÃOCiência e tecnologia sempre andam lado a lado e dependem do desenvolvimento técnico dos instrumentos de medida, de observação, de análise e de produção, que são utilizados de maneira integrada para desenvolver novos produtos. Assim, os estudos da física e da biologia baseavam-se em materiais de dimensões macroscópicas. Porém, o aperfeiçoamento e desenvolvimento constante da instrumentação, principalmente a partir de meados do século passado, tornaram possível o estudo dos materiais em escalas cada vez menores, chegando à escala nano (Figura 1). Essa estratégia possibilitou a diminuição progressiva dos dispositivos de estado sólido, provocando um aumento extraordinário do número de dispositivos que podem ser acomodados numa mesma área. Outra conseqüência foi a diminuição do consumo de energia e a possibilidade de integração de um número sempre crescente de dispositivos, tal que a capacidade dos processadores dobrou a cada 24 meses (Lei de Moore) nos últi-mos 40 anos. Atualmente um processador de última geração como o Intel Itanium de duplo processador contém mais de 1x10 9 transistores (http://www.intel.com/technology/mooreslaw/index.htm).Comportamento similar pode ser observado no caso da biologia, que iniciou com a sistematização dos organismos vivos pelos seus fenótipos e atualmente estuda a base molecular dos processos biológicos e de sua expressão....

show abstract

Highly Sensitive Amperometric Glucose Sensors Based on Nanostructured α‐Ni(OH)₂ Electrodes

Martins¹,

Rocha²,

Angnes³

et al. 2011

Electroanalysis

Self Cite

View full text Add to dashboard Cite

Stabilized a-Ni(OH) 2 nanoparticle modified fluorine doped tin oxide (FTO) electrodes were shown to be excellent glucose amperometric FIA sensors exhibiting high specific sensitivity (446 mA mM À1 cm À2 ), low limit of detection (3 mM) and high analytical frequency (128 analyses/hour). The electrodes were constituted by~20 nm nanoparticles and the limit of detection was only slightly improved in hydrodynamic as compared to diffusional conditions reflecting the enhanced surface area and the moderate heterogeneous electron transfer rates at the nanostructured aNi(OH) 2 /solution interface.

show abstract

Supramolecular Porphyrins as Electrocatalysts

Cited by 12 publications

References 169 publications

Metalloporphyrin Catalysts of Oxygen Reduction

Metalloporphyrin Catalysts of Oxygen Reduction

Estratégia supramolecular para a nanotecnologia

Highly Sensitive Amperometric Glucose Sensors Based on Nanostructured α‐Ni(OH)₂ Electrodes

Contact Info

Product

Resources

About

Supramolecular Porphyrins as Electrocatalysts

Cited by 12 publications

References 169 publications

Metalloporphyrin Catalysts of Oxygen Reduction

Metalloporphyrin Catalysts of Oxygen Reduction

Estratégia supramolecular para a nanotecnologia

Highly Sensitive Amperometric Glucose Sensors Based on Nanostructured α‐Ni(OH)2 Electrodes

Contact Info

Product

Resources

About

Highly Sensitive Amperometric Glucose Sensors Based on Nanostructured α‐Ni(OH)₂ Electrodes