以微電鍍法製備非晶鎳基三元合金(鎳鉻鋅、鎳鉬鋅、鎳鎢鋅和鎳鉬鎢)及其電化學行為

Project Details

Description

This work aims to study the candidate electrodes made of Ni-based alloys for substituting the platinum group metal (PGM) used in the hydrogen production of water electrolysis. A patented technique termed microanode guided electroplating (MAGE) developed in our laboratory was suitable for preparing alloy micropillars in nanocrystalline and amorphous structures. The target was to fabricate the selfsupporting pillars of Ni-Cr-Zn, Ni-Mo-Zn, and Ni-W-Zn ternary alloys, in a diameter of 30 ~ 200 μm and a height of 10 ~ 15 mm. Both single pillar and a bundles of pillars assembled to an array were used as the electrode for the catalytic test. On the other hand, after Hull-cell testing to select the optimal current densities, typical thin-films in corresponding alloys were prepared by traditional electroplating. The catalytic activity of the cathodes made of a single pillar, an array of micropillars, and a piece of thin-film was compared. Resulting from the test, the best cathode served in an alkaline electrolysis to produce hydrogen could be selected. In the meantime, seeking for the optimal compositions of Ni-Cr-Zn, Ni-Mo-Zn and Ni-W-Zn alloys was also of interest to attain the best catalytic performance. Experimental parameters (including the gap between electrodes, bias, bath composition, concentration of the alloying elements, chelate, and pH value) used in MAGE were investigated. From the alloy composition, distribution of elements, and the crystal phases in the microstructure affected by the parameters, we try to find out the dependence of the electrode's catalytic activity on the fabrication parameters. Based on this fact,we can select the best cathode served in the alkaline electrolysis with long-lived serving and the highest activity. According to our preliminary, the cathode of micropillars is superior to that of thin films. This superiority is attributed to the steric structure micropillars to prevent deactivation in thin films caused by the adsorption of massive bubbles of hydrogen gas on the film surface. We expect an array of cathodes assembled by a bundle of micropillars to benefit a high catalytic activity.
StatusFinished
Effective start/end date1/08/2130/09/22

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 7 - Affordable and Clean Energy

Keywords

  • Micro-anode guided electrodeposition (MAGE)
  • alloy electroplating
  • Ni-based alloys
  • nanocrystalline
  • hydrogen evolution reaction
  • Alkaline electrolysis
  • alkaline corrosion
  • electrochemical behaviors

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