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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: Focus: Materials for Energy Storage

KFM 9.8: Vortrag

Dienstag, 2. April 2019, 12:30–12:50, PHY 5.0.21

Water splitting by pyroelectric single crystals — •Wolfram Münchgesang, Thomas Köhler, Erik Mehner, Hartmut Stöcker, and Dirk C. Meyer — Institut für Experimentelle Physik, Technische Universität Bergakademie Freiberg, Leipziger Str. 23, 09599 Freiberg, Germany

The generation of hydrogen through water electrolysis has been understood for a long time and will be used for large-scale conversion of electrical energy into chemical energy in the future. The direct conversion of residual heat into hydrogen is completely new to our knowledge, but feasible when making use of pyroelectric materials. In pyroelectrolysis, a cyclic temperature excitation generates an electric field between the crystal surfaces due to an imbalance between polarization and compensation charges. This field can be used for water splitting, theoretical.

For the verification of the water splitting with pyroelectric single crystals an electrochemical measuring cell with optical heating was developed. With this setup, the proof of water splitting has been achieved. Furthermore, the reaction rates could be determined from the amount of transferred charges and compared with the theory.