Low content cerium oxide nanoparticles on carbon for hydrogen peroxide electrosynthesis

Assumpção, M.H.M.T.; Moraes, Adriel S.; Souza, R. F. B. de; Gaubeur, Ivanise; Oliveira, Reinaldo Cunha de; Antonin, Vanessa S.; Malpass, Geoffroy Roger Pointer; Rocha, Robson S.; Calegaro, Marcelo L.; Lanza, Marcos R.V.; Santos, Mauro C.

doi:10.1016/j.apcata.2011.09.030

Cited by 111 publications

(38 citation statements)

References 51 publications

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“…The acid treatment resulted in a stronger surface modification, favoring the formation of a larger amount of oxygenated groups [23,29]. A higher concentration of oxygenated groups favors the formation of a more hydrophilic surface [30], which, in turn, could result in high catalytic activities toward the two-electron transference in the ORR, as already reported in [16,31].…”

Section: Resultsmentioning

confidence: 79%

Surface and Catalytical effects on Treated Carbon Materials for Hydrogen Peroxide Electrogeneration

et al. 2015

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This work focuses on the catalytic activity and surface modification of Vulcan XC 72R and Printex L6 toward the oxygen reduction reaction (ORR) after the carbon supports were subjected to a pre-treatment with nitric acid or ammonia. The results indicated that acid-treated Printex L6 was the bestsuited material toward the two-electron pathway of the ORR. This material contained the largest concentration of oxygenated acid species and hydrogen, as determined by XPS, the Boehm method, and elemental analysis. The enhanced formation of H 2 O 2 for acid-treated Printex L6 can be explained by the presence of oxygenated acid species increasing the hydrophilic character of the carbon support. The hydrophilicity of the material was investigated by contact angle measurements. However, the changes of the surface area, porosity, and the aliphatic chains of the carbons induced by the pre-treatments and the contributions of these factors to H 2 O 2 production cannot be disregarded.

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Section: Resultsmentioning

confidence: 79%

Surface and Catalytical effects on Treated Carbon Materials for Hydrogen Peroxide Electrogeneration

et al. 2015

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“…To date, most of the works report on metal oxide/carbon composites as catalysts for the 4e À ORR to replace noble metals in fuel cells and for Zn-air batteries. Less efforts have been put on the development of highly efficient catalysts for 2e À ORR [19,25,26] were purchased from Sigma-Aldrich; Printex 6L carbon was purchased from Evonik-Degussa; sodium hydroxide (NaOH, 95.0%) and potassium hydroxide (KOH, 85.0%) were purchased from Fischer. Nafion solution (5 wt%) was purchased from Ion Power.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, pristine transition metal oxides usually exhibit limited ORR activities and insufficient durability, probably due to their low electrical conductivity and agglomeration during operation. The loading of transition metal oxides on conducting high surface carbon supports (carbon blacks, activated carbon, porous carbon, carbon nanotubes, graphene and N-doped graphene) has been used to overcome these limitations [19,21,[25][26][27][28][29][30][31]. In this way, considering that both carbon materials and transition metal oxides have considerable ORR activities, it is attractive to study the ORR performances of their composites.…”

Section: Introductionmentioning

confidence: 99%

Oxygen reduction to hydrogen peroxide on Fe3O4 nanoparticles supported on Printex carbon and Graphene

Barros

Wei

Zhang

et al. 2015

Electrochimica Acta

139

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“…ou pela decomposição do peróxido de hidrogênio Algumas das principais classes de catalisadores estudados na RRO são metais [29][30][31] e ligas metálicas [32,33]; sendo também estudados materiais não metálicos, tais como óxidos metálicos [34,35], materiais carbonosos (por exemplo quinonas e azobenzeno) [36][37][38] e complexos macrocíclicos, tais como porfirinas [39] e ftalocianinas [40,41]. A seguir, são apresentados e discutidos os mecanismos envolvendo a RRO e complexos macrocíclicos metálicos, em especial as ftalocianinas metálicas.…”

Section: -Rota Envolvendo Elétrons (Geração De Peróxido De Hidrogênio)unclassified

Estudos eletroquímicos da reação de redução de oxigênio utilizando catalisadores a base de carbono contendo ftalocianinas metálicas

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Resumo A campanha dos refratários à base de carbono aplicados como revestimento de trabalho de diversos equipamentos siderúrgicos depende da soma de diversos fatores como resistência à corrosão, resistência à oxidação do carbono, estabilidade termomecânica, entre outros. Durante a etapa de aquecimento inicial de revestimentos refratários novos ocorre a oxidação prematura do carbono presente no revestimento refratário, reduzindo a vida útil do revestimento precocemente. Para reduzir a oxidação precoce do carbono foi desenvolvido um novo coating cerâmico que atua como uma eficiente barreira física, reduzindo o contato do oxigênio da atmosfera de aquecimento com o carbono presente no refratário. O coating desenvolvido possui uma fase ligante com pega química ativada termicamente e possui como carga refratária um composto sílico-aluminoso com elevada estabilidade térmica. Os resultados laboratoriais de avaliação de desempenho revelaram que com a aplicação do novo coating desenvolvido reduz-se a oxidação prematura do carbono em até 77% e eleva-se a vida útil do revestimento em alguns casos em até 15%. O coating desenvolvido revelou possuir excelente desempenho quanto a proteção do refratário MgO-C contra a oxidação do carbono que ocorre durante a etapa de aquecimento de equipamentos com refratários novos, comprovando sua aplicabilidade em diversos equipamentos siderúrgicos que possuem revestimentos refratários à base de carbono. Palavras-chave: Coating cerâmico; Oxidação; Refratários à base de carbono. Abstract The campaign of the carbon-based refractories applied as working line of steel making equipment's depends on many factors, such as corrosion resistance, oxidation resistance carbon, thermo-mechanical stability, among others. During the initial heating stage of new refractory lining, the premature oxidation of the carbon present in the coating occurs, reducing the refractory's lifespan. Aiming to reduce this oxidation's effects, a new ceramic coating was developed, that acts as an efficient physical barrier, reducing the contact of atmosphere's oxygen with the carbon in the refractory. This new coating has a binder phase with a thermally activated chemical handle and has as refractory load a silico-aluminous compound with high thermal stability. Laboratory results of performance evaluation revealed that with the application of this new coating, the premature oxidation of carbon reduces up to 77% and the lifespan rises up to 15%. This coating was found to have an excellent performance regarding the protection of the MgO-C refractories' against the carbon oxidation that occurs during the heating stage of equipment's with new refractories, proving its applicability in various steel equipment that have carbon based refractory linings.

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Low content cerium oxide nanoparticles on carbon for hydrogen peroxide electrosynthesis

Cited by 111 publications

References 51 publications

Surface and Catalytical effects on Treated Carbon Materials for Hydrogen Peroxide Electrogeneration

Surface and Catalytical effects on Treated Carbon Materials for Hydrogen Peroxide Electrogeneration

Oxygen reduction to hydrogen peroxide on Fe3O4 nanoparticles supported on Printex carbon and Graphene

Estudos eletroquímicos da reação de redução de oxigênio utilizando catalisadores a base de carbono contendo ftalocianinas metálicas

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