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Updated: May 21, 2025

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
Published on: July 28, 2020
Triggering the oxide path mechanism of oxygen evolution reaction: Introducing compressive strain on NiFe-LDH by
Zhaoyan Li1, Duo Wang2, Hongguang Kang2
1College of Science, Northeastern University, Shenyang 110819 Liaoning, China.
Abstract:
NiFe layered double hydroxides (NiFe-LDHs) as an oxygen evolution reaction (OER) catalyst show great potential in alkaline water electrolysis. However, its electrocatalytic activity along with good stability is still an obstacle for practical utilization. In this work, we partially replace the metal ions of original NiFe-LDH with Ba cations to construct compression strain and trigger the oxide path mechanism (OPM) of OER. The experimental and theoretical calculation results show that the replacement with Ba cations in the original NiFe-LDH results in shortened distance of two adjacent Ni sites and a decreased d-band center, which promote the direct coupling of *O-*O radical and enhance O2 desorption ability. Attributable to the improved catalytic activity and kinetics of OER, the NiFe-LDH partially replaced with Ba cations presents a low overpotential of 241 mV at 500 mA cm-2 and remains stable for 100 h at 200 mA cm-2. Our study provides a chemical after-treatment method to introduce compressive strain in the NiFe-LDH and trigger the OPM in OER for alkaline water electrolysis.
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