Implementation of STOFF 2 GmbH’s Technology on Lab-Scale

Abstract

This thesis investigates the lab-scale application of the STOFF 2 GmbH’s technology - often referred to as Zinc Intermediate Step Electrolyser - with an emphasis on improving electrochemical processes for hydrogen generation and energy storage. The study focuses on the electrochemical behaviour of zinc, iron, and nickel electrodes, offering valuable insights into the hydrogen evolution reaction and oxygen evolution reaction. The study addresses the need for more effective and sustainable methods of storing renewable energy and production of green hydrogen. Current electrolysis technologies, while promising, confront substantial obstacles that prevent widespread application. Issues such as high energy consumption, dependency on high-cost supplies, electrolyzer component degradation, and demanding water purity standards all contribute to variations in efficiency and scalability. This study seeks to address these issues by studying the electrochemical performance of the above-mentioned electrode materials zinc, iron, and nickel under different settings to determine optimum environments for hydrogen and oxygen evolution reactions. The experimental techniques involved designing electrode holders and evaluating the behaviour of the electrode materials, as well as electroplated zinc, using cyclic voltammetry and electrochemical impedance spectroscopy. Cyclic voltammetry was used to evaluate oxidation-reduction peaks and determine the effects of electrolyte content and scan rate on hydrogen and oxygen evolution reactions. Electrochemical impedance spectroscopy offered detailed data about charge transport, electrolyte resistance, and electrode resistance at various potentials. This study contributes to the advancement of green hydrogen generation and energy storage using Zinc Intermediate Step Electrolysis technology by highlighting the potential of zinc, iron, and nickel electrodes to increase electrolysis efficiency. Future research may focus on scaling these findings for industrial applications, therefore promoting the development of more sustainable energy solutions.

Date of Award	2024
Original language	English
Supervisor	Christina Toigo (Supervisor)