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Robust MOF-253-derived N-doped carbon confinement of Pt single nanocrystal electrocatalysts for oxygen evolution reaction

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Chinese Journal of Catalysis 2020年第5期41卷 839-846页

作者： hellen gabriela rivera monestel Ibrahim Saana Amiinu Andrés Alvarado González Zonghua Pu BibiMaryam Mousavi Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070HubeiChina

Although carbon-supported platinum(Pt/C) is still considered the most active electrocatalyst for hydrogen evolution reaction(HER) and oxygen reduction reaction(ORR), its applications in metal–air batteries as a cathode catalyst, or for oxygen generation via water splitting electrolysis as an anode catalyst is mainly constrained by the insufficient kinetic activity and stability in the oxygen evolution reaction(OER). Here, MOF-253-derived nitrogen-doped carbon(N/C)-confined Pt single nanocrystals(Pt@N/C) have been synthesized and shown to be efficient catalysts for the OER. Even with low Pt mass loading of 6.1 wt%(Pt@N/C-10), the catalyst exhibits greatly improved activity and long-time stability as an efficient OER catalyst. Such high catalytic performance is attributed to the core-shell structure relationship, in which the active N-doped-C shell not only provides a protective shield to avoid rapid Pt nanocrystal oxidation at high potentials and inhibits the Pt migration and agglomeration, but also improves the conductivity and charge transfer kinetics.

关键词： Pt MOF-253 Carbon confinement Oxygen evolution reaction Electrocatalyst

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Ulcerated Lesion in Buccal Mucosa in a Patient with Paracoccidioidomycosis——Case Report

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Journal of Biosciences and Medicines 2017年第10期5卷 44-50页

作者： Giovanna Lima Vaz Livia Cristina de Melo Pino Aline gabriela Santos Costa Ibrahim Yahia El Somailli Joao Roberto Resende Fernandes Elayne Christina Meireles Martins Daniel Cohen Goldemberg Aline hellen da Silva Camacho Rhanna Neves Cirqueira Daniel Almeida da Costa College of Medicine of Valenca—FAA/Cesva ValencaBrazil National Cancer Institute—INCA Rio de JaneiroBrazil Centro Universitario de Belo Horizonte-UNIBH Belo HorizonteBrazil

Paracoccidioidomycosis is the most prevalent systemic mycosis in Latin America. It is a fungal infection caused by the dimorphic fungus Paracoccidioides brasiliensis. This microorganism can penetrate the human body through direct contact and can cause intense lymphadenopathy, ulcerated lesions in the oral cavity and in the skin among other alterations. In this study, we report a case of paracoccidioidomycosis with unusual clinical presentation, as it manifested in the female sex and although it did not present any relevant complaints of respiratory focus, it presented a single ulcerated lesion in the buccal mucosa. A biopsy of the lesion and a mycological examination revealed Paracoccidioidesbrasiliensis infection.

关键词： Paracoccidioidomycosis Paracoccidioides brasiliensis Endemic Mycosis

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