@PhDThesis{Santos:2024:DeÂnDe,
author = "Santos, Mariany Ludgero Maia Gomes",
title = "Desenvolvimento de {\^a}nodo para decomposi{\c{c}}{\~a}o de
etanol aplicado em c{\'e}lula a combust{\'{\i}}vel",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2024",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2023-10-31",
keywords = "suporte catal{\'{\i}}tico, eletrocatalisadores, {\^a}nodo,
c{\'e}lula a combust{\'{\i}}vel, catalytic support,
electrocatalysts, anode, fuel cell.",
abstract = "Nos {\'u}ltimos anos, elevou-se a busca por PBD´s (Power Bank
Device) que pudessem ser embarcados nos sat{\'e}lites,
desempenhando a fun{\c{c}}{\~a}o de complementa{\c{c}}{\~a}o
da demanda energ{\'e}tica da miss{\~a}o. Uma alternativa
promissora para desempenhar esta fun{\c{c}}{\~a}o {\'e} a
c{\'e}lula a combust{\'{\i}}vel. A c{\'e}lula a
combust{\'{\i}}vel {\'e} um sistema eletroqu{\'{\i}}mico
capaz de converter a energia qu{\'{\i}}mica de um
combust{\'{\i}}vel diretamente em energia el{\'e}trica e calor.
Sendo assim, o presente trabalho versa sobre o desenvolvimento de
suporte catal{\'{\i}}tico, xerogel de carbono (XC), para os
eletrocatalisadores de Pd e Nb (pal{\'a}dio e ni{\'o}bio), e
compara{\c{c}}{\~a}o com eletrocatalisadores de Pd e Nb
suportados em negro de fumo Vulcan® XC72R, para serem utilizados
como {\^a}nodo em uma c{\'e}lula a combust{\'{\i}}vel do tipo
ADEFC (Alkaline Direct Ethanol Fuel Cell). O XC {\'e} derivado do
sistema tanino-formalde{\'{\i}}do, e uma das vantagens do tanino
{\'e} ser uma mat{\'e}ria prima de origem natural, e se
apresenta como um precursor barato e renov{\'a}vel. A presente
tese de doutorado apresenta um estudo sistem{\'a}tico e amplo
sobre a influ{\^e}ncia do suporte catal{\'{\i}}tico, suas
caracter{\'{\i}}sticas fundamentais e ideais para que possa ser
aplicado com {\^e}xito na aplica{\c{c}}{\~a}o proposta. O XC e
o Vulcan® XC72R foram avaliados via Fisissor{\c{c}}{\~a}o de N2,
MEV-FEG, DRX, Espectroscopia Raman, FTIR, EDS, XPS, TG, DTG, DSC,
{\^a}ngulo de contato, al{\'e}m da determina{\c{c}}{\~a}o e
influ{\^e}ncia do pH dos suportes nos sistemas estudados. O XC
apresentou uma {\'a}rea superficial exposta de 1725 m2/g, alta
rela{\c{c}}{\~a}o ID/IG (4,81) corroborando com a amorficidade
apresentada por DRX e maior variedade de grupos funcionais, se
comparado ao Vulcan® XC72R. J{\'a} os eletrocatalisadores
incorporados no XC e Vulcan® XC72R foram avaliados via
Fisissor{\c{c}}{\~a}o de N2, MEV-FEG, EDS, MET, DRX,
Espectroscopia Raman, {\^a}ngulo de contato, XPS e tiveram suas
propriedades tamb{\'e}m analisadas eletroquimicamente, e
observou-se o qu{\~a}o importante {\'e} a influ{\^e}ncia do
suporte catal{\'{\i}}tico e da presen{\c{c}}a do Nb como
co-catalisador, uma vez que o Nb melhora a intera{\c{c}}{\~a}o
metal suporte do Pd, mesmo conferindo maior hidrofobicidade ao
sistema, confirmando que a dispers{\~a}o met{\'a}lica {\'e} de
extrema import{\^a}ncia na efici{\^e}ncia
eletrocatal{\'{\i}}tica. ABSTRACT: In recent years, the search
for PBDs (Power Bank Device) that could be embedded on satellites
has increased, fulfilling the function of complementing the
mission's energy demand. A promising alternative to perform this
function is the fuel cell. The fuel cell is an electrochemical
system capable of converting the chemical energy of a fuel
directly into electrical energy and heat. Therefore, the present
work deals with the development of catalytic support, carbon
xerogel (XC), for Pd and Nb (palladium and niobium)
electrocatalysts, and comparison with Pd and Nb electrocatalysts
supported on Vulcan® XC72R carbon black, to be used as anode in an
ADEFC (Alkaline Direct Ethanol Fuel Cell) fuel cell. The XC is
derived from the tannin-formaldehyde system, and one of the
advantages of tannin is that it is a raw material of natural
origin and is a cheap and renewable precursor. This doctoral
thesis presents a systematic and broad study on the influence of
catalytic support, its fundamental and ideal characteristics so
that it can be successfully applied in the proposed application.
The XC and the Vulcan® XC72R were evaluated via N2 Physisorption,
SEM-FEG, XRD, Raman spectroscopy, FTIR, EDS, XPS, TG, DTG, DSC,
contact angle, in addition to determining the pH and studying the
influence of the pH of the supports in the systems studied. The XC
presented an exposed surface area of 1725 m2/g, a high ID/IG ratio
(4.81), corroborating the amorphicity presented by XRD and a
greater variety of functional groups, compared to the Vulcan®
XC72R. The electrocatalysts were evaluated via N2 Physisorption,
SEM, EDS, TEM, XRD, Raman, contact angle, XPS and had their
properties also analyzed electrochemically, and it was observed
how important is the influence of the catalytic support and the
presence of Nb as a co-catalyst, since Nb improves the
metal-support interaction of Pd, even providing greater
hydrophobicity to the system, confirming that metal dispersion is
extremely important in electrocatalytic efficiency.",
committee = "Baldan, Mauricio Ribeiro (presidente/orientador) and Oliveira,
Isa{\'{\i}}as de (orientador) and Okamoto, Sayuri (orientador)
and Savonov, Graziela da Silva and Matsushima, Jorge Tadao and
Borges, Cl{\'a}udia Renata",
englishtitle = "Development of an anode for decomposition of ethanol applied in
fuel cell",
language = "pt",
pages = "132",
ibi = "8JMKD3MGP3W34T/4A77NHP",
url = "http://urlib.net/ibi/8JMKD3MGP3W34T/4A77NHP",
targetfile = "publicacao.pdf",
urlaccessdate = "05 maio 2024"
}