6 documents found, page 1 of 1
Sustainable Additives for the Production of Hydrogen via Sodium Borohydride Hyd...
Gomez-Coma, Lucia; Silva, Diogo; Ortiz, A.; Rangel, C. M.; Ortiz-Martínez, V. M.; Pinto, A. M. F. R.; Ortiz, InmaculadaABSTRACT: Finding stable solutions for hydrogen storage is one of the main challenges to boosting its deployment as an energy vector and contributing to the decarbonization of the energy sector. In this context, sodium borohydride (NaBH4) has been largely studied as a hydrogen storage material due to its significant advantages, such as low pressure, stability, and high hydrogen storage density. The development ...
New modified Nafion-bisphosphonic acid composite membranes for enhanced proton ...
Teixeira, Fatima; de Sá, A.I.; Teixeira, António P. S.; Ortiz-Martínez, V. M.; Ortiz, A.; Ortiz, Inmaculada; Rangel, C. M.ABSTRACT: Proton exchange membranes remain a crucial material and a key challenge to fuel cell science and technology. In this work, new Nafion membranes are prepared by a casting method using aryl- or azaheteroaromatic bisphosphonate compounds as dopants. The incorporation of the dopant, considered at 1 wt% loading after previous selection, produces enhanced proton conductivity properties in the new membranes,...
New modified Nafion-biphosphonic acid composite membranes for enhanced proton c...
Teixeira, Fatima; Sá, A.I. De; Teixeira, António P. S.; Ortiz-Martínez, V. M.; Ortiz, A.; Ortiz, Inmaculada; Rangel, C. M.ABSTRACT: The performance of PEM fuel cells critically depends on their proton exchange membrane structural and chemical stabilities as well as on their proton conductivity. Limitations of commercially available Nafion membranes to operating at temperatures above 80 ºC have fostered the interest in research and development of new membranes [1,2]. The aim of this work is the preparation of new modified Nafion co...
Comprehensive review and future perspectives on the photocatalytic hydrogen pro...
Corredor, Juan; Rivero, María J.; Rangel, C. M.; Gloaguen, Frederic; Ortiz, InmaculadaABSTRACT: Hydrogen represents a renewable energy alternative that may positively contribute to get over the global energy crisis while at the same time reducing its environmental burden. Overcoming the challenge of reaching this potential could be helped by careful choice of hydrogen (H-2) sources. Photocatalytic generation of H-2, although a minor alternative, appears to be a very good option at the time that ...
New modified Nafion-biphosphonic acid composite membranes for enhanced proton c...
Teixeira, Fatima; Sá, A.I. De; Teixeira, António P. S.; Ortiz-Martínez, V. M.; Ortiz, A.; Ortiz, Inmaculada; Rangel, C. M.ABSTRACT: The performance of PEM fuel cells critically depends on their proton exchange membrane structural and chemical stabilities as well as on their proton conductivity. Limitations of commercially available Nafion membranes to operating at temperatures above 80 ºC have fostered the interest in research and development of new membranes [1,2]. The aim of this work is the preparation of new modified Nafion co...
Challenges arising from the use of TiO2/rGO/Pt photocatalysts to produce hydrog...
Ribao, Paula; Esteves, M. Alexandra; Fernandes, Vitor; Rivero, María J.; Rangel, C. M.; Ortiz, InmaculadaABSTRACT: Photoreforming has emerged as a novel technology expected to obtain chemical energy through solar energy transformation. In this way, sustainable valorization of glycerol, a biodiesel by-product, to clean fuels is a promising alternative to help meet the world's growing energy demand. In this work, TiO2/rGO(x)/Pt(y) photocatalysts have been developed for hydrogen production from synthetic and crude gl...