Engineering graphene surface toward design of aggregation-resistant catalyst supports for advanced energy conversion
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2017
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PAN AMERICAN CONGRESS OF NANOTECHNOLOGY, 1st
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Graphene has been considered an emerging fuel cell catalyst support due to its excellent
chemical and electrical properties. The evaluation of the unit activity on each catalytic site
(intrinsic) of low-loading supported metal nanoparticles (NPs), however, is often hampered by
face-to-face aggregation of graphene sheets. Herein, we demonstrate the critical role of the
expansion between sheets in a pivotal electrocatalytic process for green energy conversion
through ethanol oxidation in acid medium. In order to reduce mass-transport resistances and
incomplete utilization of the supported NPs, a one-step design strategy is proposed for tuning a
desired physicochemical property of graphene: surface area. This step is based on the principle
that the apparent activity is governed by the extrinsic activity, i . e ., the number of exposed active
sites for a particular mass loading. Our design principle is achieved by a two-stage method
involving a chemical delamination process of graphite (1) with an in situ surfactant
functionalization/intercalation–reduction approach (2). As a result, not only an interlayer
expansion was attained but also a short-ranged layered structure was assembled. This
structural reorganization substantially affected the ethanol oxidation reaction (EOR) over
platinum NPs. The unique nanoarchitecture provided a high density of EOR active sites, which
incurred in a specific current value increased by about 2.5 and 5.4 times compared to platinum
supported on state-of-the-art carbon black and restacked graphene, respectively.
Como referenciar
CORDEIRO, GUILHERME L.; CAMARGO, ELAINE F. de; USSUI, VALTER; LIMA, NELSON B. de; NETO, ALMIR O.; LAZAR, DOLORES R.R. Engineering graphene surface toward design of aggregation-resistant catalyst supports for advanced energy conversion. In: PAN AMERICAN CONGRESS OF NANOTECHNOLOGY, 1st, 27-30 de novembro, 2017, Guarujá, SP. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/29035. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.