The 26th International Conference on Accelerators and Beam Utilizations

Vertically Aligned β-NiOOH Nanosheet as Highly Active and Stable Catalytic Sites for Oxygen Evolution Reaction in Alkaline Media

Nov 14, 2024, 1:00 PM

1h 30m

2F Poster Hall

Board: WG4-12

Poster ICABU WG4. Applications of Particle Beams ICABU Poster Session

Speaker

Jeonghyeon Kim (Kyungpook National University)

Description

The long-term stability of Ni-based catalysts, employed in the anode of anion exchange membrane water electrolyzers (AEMWE), has been a persisting concern. In this work, through a simple and powerful electrochemical anodization process, vertically aligned β-NiOOH atomic sheets (vertical-β-NiOOH) grown on Fe-doped Ni nanoplates (FeNi nanoplates) as a solution are offered. The HRTEM and in-situ XAFS results revealed well-created vertical-β-NiOOH on the surface of FeNi nanoplates with Ni$^4$$^+$ active phase. This innovative electrocatalyst demonstrates sustained stability of constant current density for over 120 days during the oxygen evolution reaction. The zero-gap AEMWE cell harnessing the anodized FeNi nanoplates achieves a remarkable current density of 2.26 A cm$^−$$^2$ at 1.80 V with an energetic efficiency of 85.1%.