鎳鈷鐵合金微柱之電鍍研製及其在電解水析氧之研究

Project Details

Description

The aim of this project is to prepare iron-group (Fe, Co, Ni) alloy microcolumns, which are key materials used as the anode to replace the precious group metals (PGMs) in the alkaline electrolysis method (AEM). With high electrochemical reactivity but low cost, these innovative anodes are good candidates to couple with the reactive cathodes in a cell to produce hydrogen gas economically. The reactive cathodes (including NiZn, NiMo, and NiMoW alloy systems) developed in our previous work were ready (please refer to our 2019 MOST report). Fe-group alloys such as NiFe, CoFe, and NiFeCo microcolumns were prepared in our preliminary tests. They are long-life due to the formation of stable hydroxides;and the high reactivity in catalytical oxygen evolution reaction (OER) due to nanocrystalline and amorphous structure. By taking the advantages of high reactivity and durability, we try to investigate the NiFe, CoFe, and NiFeCo alloy systems to find the optimal conditions in the preparation of microcolumns by the patented process microanode guided electroplating (MAGE). The effect of the morphology, composition, crystal structure on the catalytical reactivity, echanical property, corrosion resistance is of interest. The free-standing microcolumns will be arranged in a matrix of anodes in scaling up. In this work,experimental conditions, including electric field intensity, ion concentration of the alloy metals, chelating agent, gap between the electrode were concerned to discuss the correlation of the composition and microstructure to the OER catalytic activity, mechanical property, and corrosion resistance. The best alloy microcolumns are then selected and assembled into an array of 5×5 and 10×10. The anode matrix is coupled with the Ni-Mo-W alloy cathode matrix to construct the AEM cell. The commercial alkaline anion exchange membrane (X37-50) is the separator in the cell. The oxygen- and hydrogen-production is tested at constant-current water electrolysis, and the current efficiency is estimated. Chromium is also considered to add to the Fe-group alloys to enhance the OER catalysis and corrosion resistance. These alloys will conduct electrochemical techniques such as Tafel plot, dynamic cyclic polarization of anode, electrochemical impedance spectrum to study the corrosion and oxidationmechanism of the alloy anode in the alkaline environment.
StatusFinished
Effective start/end date1/08/2231/07/23

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 2 - Zero Hunger
  • SDG 7 - Affordable and Clean Energy
  • SDG 8 - Decent Work and Economic Growth
  • SDG 17 - Partnerships for the Goals

Keywords

  • Fe-Co-Ni alloy
  • alkaline water electrolysis
  • micro anode guided electroplating
  • nanocrystalline
  • amorphous
  • hydroxide
  • oxygen evolution reaction
  • cathodic cyclic potentiodynamic polarization
  • alkaline corrosion

Fingerprint

Explore the research topics touched on by this project. These labels are generated based on the underlying awards/grants. Together they form a unique fingerprint.