High temperature Electrochemical Impedance Spectroscopy Transmission electron mi...
High temperature Electrochemical Impedance Spectroscopy Transmission electron microscopy on energy materials
The great challenge for humankind is to mitigate climate changes by replacing fossil fuels with renewables. We will have to store excess energy produced by solar and wind power for usage in dark and calm weather. Excess energy can...
The great challenge for humankind is to mitigate climate changes by replacing fossil fuels with renewables. We will have to store excess energy produced by solar and wind power for usage in dark and calm weather. Excess energy can be stored electrochemically by high-temperature electrolysis cells as they have the potential to store vast amounts of electrical energy by conversion to chemical fuels. Solid oxide electrolysis cell (SOEC) technology is well known and proven, but not price competitive with storage of fossil fuels.
To drive the SOEC research towards a breakthrough, it is critical to determine relations between electrochemical activity and structure/composition in the cells. Electrochemical impedance spectroscopy (EIS) is a very powerful method for determining the contribution from processes in the cell to the overall activity. EIS cannot show structure/composition which is offered by transmission electron microscopy (TEM). Conventional TEM, however, does not offer insight into active cells, but only post mortem analysis.
High-temperature electrochemical TEM is extremely challenging because this requires a) that hard and brittle ceramic cells are thinned to electron transparency (ca. 100 nm), b) that the cells are carefully designed to allow for characterization of the layer interfaces, and c) that the cells are characterized during exposure of i) reactive gasses, ii) electrical potentials and iii) temperatures up to ca. 800 °C.
The aim of HEIST is to cover step a) to c), i.e. to transform TEM into an electrochemical lab for high-temperature electrochemical experiments including EIS. HEIST will give us live images of nanostructures and composition during operation of the electrochemical cells and thus disclose structure-activity relations. This is important, because the structures of nanomaterials will transform depending on the electrochemical environment, and post mortem analysis does not offer a correct representation of the active nanostructures.ver más
Seleccionando "Aceptar todas las cookies" acepta el uso de cookies para ayudarnos a brindarle una mejor experiencia de usuario y para analizar el uso del sitio web. Al hacer clic en "Ajustar tus preferencias" puede elegir qué cookies permitir. Solo las cookies esenciales son necesarias para el correcto funcionamiento de nuestro sitio web y no se pueden rechazar.
Cookie settings
Nuestro sitio web almacena cuatro tipos de cookies. En cualquier momento puede elegir qué cookies acepta y cuáles rechaza. Puede obtener más información sobre qué son las cookies y qué tipos de cookies almacenamos en nuestra Política de cookies.
Son necesarias por razones técnicas. Sin ellas, este sitio web podría no funcionar correctamente.
Son necesarias para una funcionalidad específica en el sitio web. Sin ellos, algunas características pueden estar deshabilitadas.
Nos permite analizar el uso del sitio web y mejorar la experiencia del visitante.
Nos permite personalizar su experiencia y enviarle contenido y ofertas relevantes, en este sitio web y en otros sitios web.