There is an ever increasing need for clean, portable energy devices, such as fuel cells and high energy batteries to replace or reduce the world’s dependence on fossil fuels. The continued development of thin-film solid polymer electrolytes with improved mechanical and ion transport properties is critical for the further advancement of such electrochemical energy devices. For hydrogen and metha...

Abstract Proton conductors are promising materials for clean energy, but most available exhibit sufficient conductivity only when chemically substituted to create oxygen vacancies, which often leads difficulty in sample preparation and chemical instability. Recently, proton based on hexagonal perovskite‐related oxides have been attracting attention as they high even without the substitutions. H...

The proton conductivity of a Nafion 112 membrane is measured with a resolution of ca. 10 nm using Electrochemical Atomic Force Microscopy. The observations are compared with the Gierke model of the micro-morphology due to phase separation of the hydrophobic polymer backbone and the hydrophilic pendant groups. The results demonstrate a highly inhomogeneous conductivity distribution which is attr...

*Correspondence: Maria Luisa Di Vona, Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italia e-mail: [email protected] The cross-link reaction via sulfone bridges of sulfonated polyether ether ketone (SPEEK) by thermal treatment at 180°C in presence of dimethylsulfoxide is discussed. The modifications of properties sub...

A quitosana é um polissacarídeo natural obtido a partir da reação de desacetilação da quitina, sendo o polímero natural mais abundante, que apresenta propriedades químicas e físicas atrativas, como por exemplo, as requeridas para obtenção de membranas poliméricas. Neste trabalho a quitosana em solução de ácido clorídrico foi quimicamente modificada com ácido sulfosuccínico (SSA), o qual reticul...

The layered P2-Nax MO2 (M: transition metal) system has been widely recognized as electronic or mixed conductor. Here, we demonstrate that Co vacancies in P2-Nax CoO2 created by hydrogen reductive elimination lead to an ionic conductivity of 0.045 S cm(-1) at 25 °C. Using in situ synchrotron X-ray powder diffraction and Raman spectroscopy, the composition of the superionic conduction phase is e...

The plasticized solid bio-polymer electrolytes (SBEs) system has been formed by introducing glycerol (Gly) as the plasticizer into the carboxymethyl cellulose (CMC) doped with oleic acid (OA) via solution casting techniques. The ionic conductivity of the plasticized SBEs has been studied using Electrical Impedance Spectroscopy. The highest conductivity achieved is 1.64 × 10(-4) S cm(-1) for sys...

The membrane bound coupling factor of photophosphorylation is studied after pretreatment of broken chloroplasts with the bifunctional N,N-orthophenyldimaleimide under energization of the thylakoid membrane by mild flashing light. The proton conduction of the membrane is monitored both via the electrochromic absorption changes and via selective pH-indicating dyes. It is found that the coupling f...

Molecular electrocatalysis for oxygen reduction at a polarized water/1,2-dichloroethane (DCE) interface was studied, involving aqueous protons, ferrocene (Fc) in DCE and cobalt porphyrin catalysts like cobalt porphine (CoP) cobalt 2,8,13,17-tetraethyl-3,7,12,18-tetramethyl-5-p-aminophenylporphyrin (CoAP) at the interface. The reaction is electrocatalytic as its rate depends on the applied Galva...

Two-probe electrochemical cells were designed for proton conductivity evaluation in the X, Y and Z directions using electrochemical impedance spectroscopy (EIS). Nafion 112, 115, 1135, 117 and 211 membranes were used to examine the conductivity in the three given directions, and to determine the influence of cell configuration and probe geometry on the accuracy and reproducibility of the measur...