Palladium nanoparticles supported on mesoporous biocarbon from coconut shell for ethanol electro-oxidation in alkaline media

Autor(es)

Ferreira, Joao C. ^[1] ; Cavallari, V, Roger ; Bergamaschi, Vanderlei S. ^[2] ; Antoniassi, Rodolfo M. ^[2] ; Teixeira-Neto, Angela A. ^[3] ; Linardi, Marcelo ^[2] ; Silva, Julio Cesar M. ^[4]

Afiliação do(s) autor(es)

^[1] IPEN, CNEN SP, Av Prof Lineu Prestes, 2242 Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil

^[2] Cavallari, Roger, V, IPEN, CNEN SP, Av Prof Lineu Prestes, 2242 Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil

^[3] Brazilian Ctr Res Energy & Mat, Brazilian Nanotechnol Natl Lab, Rua Giuseppe Maximo Scolfaro 10-000, BR-13085903 Campinas, SP - Brazil

^[4] Univ Fed Fluminense, Inst Quim, Grp Eletroquim & Mat Nanoestruturados, Campus Valonguinho, BR-24020141 Niteroi, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS FOR RENEWABLE AND SUSTAINABLE ENERGY; v. 7, n. 4 NOV 2018.
• Citações Web of Science: 3

Resumo

Palladium nanoparticles supported on carbon Vulcan XC72 (Pd/C) and biocarbon (Pd/BC) synthesized by sodium borohydride process were used as catalysts for ethanol electro-oxidation in alkaline media. The biocarbon (BC) from coconut shell with mesoporous and high surface area (792 m(2) g(-1)) was obtained by carbonization at 900 degrees C and the hydrothermal treatment in a microwave oven. The D-band and G-band intensity ratio (I-D/I-G) from Raman analysis showed high disorder of the biocarbon, while X-ray photoelectron spectroscopy (XPS) suggests higher percentage of oxygen groups on the surface of biocarbon than of Vulcan XC72. From X-ray diffraction (XRD), it was observed peaks in 2 theta degree related to the face centered cubic (fcc) structure of palladium and the mean crystallite sizes calculated based on the diffraction peak of Pd (220) were 5.6 nm for Pd/C and 5.3 nm for Pd/BC. Using Transmission Electron Microscope (TEM), it was observed particles well dispersed on both carbons support materials. The electrocatalytic activity of the materials was investigated by cyclic voltammetry (CV) and chronoamperometry (CA) experiments. The peak current density (on CV experiments) from ethanol electro-oxidation on Pd/BC was 50% higher than on Pd/C, while the current density measured at 15 min of CA experiments was 80% higher on Pd/BC than on Pd/C. The higher catalytic activity of Pd/BC might be related to the large surface area of the biocarbon (792 m(2) g(-1)) vs (239 m(2) g(-1)) of Vulcan carbon, the defects of the biocarbon structure and higher amount of oxygen on the surface than Carbon Vulcan XC 72. (AU)

• Processo FAPESP: 14/09087-4 - Estudos sobre o uso do bioetanol em células a combustível do tipo PEMFC e SOFC
• Beneficiário: Marcelo Linardi
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/15469-5 - Preparação de nanocatalisadores com morfologia controlada para aplições em purificação de hidrogênio e oxidação de hidrogênio contaminado para geração de energia elétrica
• Beneficiário: Rodolfo Molina Antoniassi
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado