Repositório do LNEG

National Laboratory of Energy and Geology Scientific Repository

Welcome to LNEG’s Scientific Repository

The LNEG’s Scientific Repository intends to preserve, disseminate and give access to LNEG's scientific production in digital format.

The objectives of the Repository are: to increase the visibility and impact of the research carried out at LNEG, to improve internal and external communication and to preserve the institution's intellectual memory.

Email repositorio@lneg.pt

Recent Submissions

Enhancing Proton Conductivity of SPEEK Based Membranes by Incorporation Graphene Oxide / Bisphosphonic acid dopant [Resumo]

Publication . Teixeira, Fatima; Teixeira, António Paulo Silva; Rangel, Carmen M.

ABSTRACT: The most commercially successful membrane for applications in fuel cell and electrolyzers, perfluorinated sulfonic NafionR, exhibits relevant performance limitations due to its dependence on water content with consequent proton mobility restrictions, environmental concerns and very high cost. Poly(etheretherketone) (SPEEK) polymer appears as a versatile non-fluorinated alternative for a low-cost and a more environmentally friendly membrane. Our previous studies showed that the incorporation of biphosphonic acid dopants (BPs) into the mentioned polymeric matrices, improves membrane proton conduction and durability1-5. In this work, we prepared and evaluated new doped SPEEK membranes using graphene oxide (GO) with bisphosphonic acid functionalities as dopant (GOBP), anticipating superior membranes properties, including proton conductivity.

2025-07Conference object

Open access

Li-ion Battery Recycling: A Summary Review

Publication . Nogueira, Carlos; Neiva Correia, Maria Joana; Margarido, Fernanda; Plancha, Maria João; Pedrosa, Fátima; Gonçalves, Ana; Silva, Clara; Silva, Sara

ABSTRACT: A short review of battery recycling technologies is presented. Main components and materials of battery cells, modules and packs are identified, highlighting their compositions and contents. Main component of packs is aluminium, followed by the cathode materials, anode materials, copper and polymers. Safe discharge of the spent batteries is mandatory, and the subsequent dismantling allows separation and valorisation of the aluminium casings, electronic components, polymers and steel. The resulting cells or modules are pretreated by shearing and drying, and the solvent and evolving gases shall be safely treated and disposed. Physical separation operations, including secondary shredding, sieving, gravity separation, among others, are applied to separate the Al, Cu and polymer fragments from the electrode powders (black mass). Metallurgical processing, by hydro or pyrometallurgy, allows further recovery of the metals in pure forms, which are then sent back to the market. Nowadays, several hydrometallurgical processes are being introduced, allowing high recovery yields of the most important metals such as lithium, cobalt, nickel and manganese. By this way, a more sustainable management of the resources can be achieved.

2025-08Conference paper

Open access

Functional alginate aerogels as green catalytic platform for CO₂-to-syngas conversion [Resumo]

Publication . Messias, Sofia; Paninho, A. B.; Vieira, G.; Souza, A.; Rangel, Carmen M.; Nunes, Daniela; Martins, Rodrigo; Mendes, Manuel Joao; Machado, Ana

2025-06Conference object

Open access

Solar Electrochemical CO2 Reduction to Syngas [Resumo]

Publication . Messias, Sofia; Paninho, A. B.; Nunes, Daniela; Rangel, Carmen M.; Nunes, A. V. M.; Branco, Luis; Martins, Rodrigo; Mendes, Manuel Joao; Machado, Ana

2025-06Conference object

Open access

New membranes for CO2 electrochemical reduction {Resumo]

Publication . Teixeira, Fatima; Teixeira, António Paulo Silva; Messias, Sofia; Martins, Rodrigo; Mendes, Manuel Joao; Machado, Ana; Rangel, Carmen M.

2025-06Conference object

Open access