International Journal of Hydrogen Energy· 2026Q1
Improving OER performance in alkaline water electrolysis with a Zn-doped NiFe LDH electrode developed via self-growth precipitation
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- Q1SCImago
- 2026year
Short summary
A Zn-doped NiFe layered double hydroxide (LDH) electrode, developed via self-growth precipitation, shows improved oxygen evolution reaction (OER) performance in alkaline water electrolysis, achieving a lower overpotential (225 mV vs. 277 mV) and Tafel slope (45.2 mV dec -1 vs. 57.8 mV dec -1) compared to undoped NiFe LDH.
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Key points
- Zn-doped NiFe LDH synthesized via self-growth precipitation shows enhanced OER activity.
- Optimized Z1N25 catalyst achieved 225 mV overpotential at 10 mA cm -2, lower than NiFe LDH (277 mV).
- Tafel slope decreased from 57.8 mV dec -1 to 45.2 mV dec -1 for the doped catalyst.
- Electrochemical activation with partial Zn elution increased surface area and reduced overpotential to 180.6 mV after 2000 cycles.
- The catalyst demonstrated over 140 hours of stability.
AI-generated from the title and abstract; the full text is not read.
Abstract
Developing cost-effective, scalable non-noble-metal electrocatalysts for the oxygen evolution reaction (OER) is essential for alkaline water electrolysis (AWE). Zn-doped NiFe layered double hydroxide (LDH) was synthesized via self-growth precipitation. Zn-incorporated NiFe LDH exhibited superior OER activity over pristine NiFe LDH due to increased surface area and electronic modulation. The optimized Z1N25 (Ni 2+ :Zn 2+ = 25:1) achieved an overpotential of 225 mV at 10 mA cm −2 , lower than NiFe LDH (277 mV), while Tafel slope decreased from 57.8 to 45.2 mV dec −1 . During cyclic voltammetry (CV) activation, partial Zn elution increased electrochemically active surface area while preserving the LDH framework, decreasing overpotential to 190.8 and 180.6 mV after 1000 and 2000 cycles, respectively. The catalyst remained stable over 140 h. Spectroscopic analysis revealed higher Ni oxidation state, enhanced M − OH formation, and Fe 2p red shift. This work demonstrates that Zn incorporation improves OER activity and long-term stability in self-grown NiFe LDH electrodes.
The authors' abstract, as published at the source. International Journal of Hydrogen Energy, 2026 · DOI ↗
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