Flame-enabled in situ engineering of stainless-steel electrodes for high-efficiency electrocatalytic oxygen evolution

doi:10.19799/j.cnki.2095-4239.2025.0292

Abstract

Abstract:

This study presents a flame-combustion-driven one-step in situ modification strategy to construct a porous NiFe composite oxide catalytic layer (NiFe/316L) on 316L stainless steel, achieving synergistic optimization of oxygen evolution reaction (OER) activity and industrial-grade stability. A hierarchical porous structure with interconnected channels was fabricated through high-temperature flame oxidation coupled with rapid quenching, inducing alloy phase separation and multiscale pore formation. X-ray photoelectron spectroscopy confirmed the coexistence and uniform distribution of Ni, Fe, and O species across the electrode surface. In 1 mol/L KOH electrolyte, the optimized electrode exhibited excellent OER performance with a low overpotential of 256 mV at 10 mA/cm², a Tafel slope of 40.8 mV/dec, and a sevenfold increase in electrochemically active surface area (141 cm²) relative to the bare substrate. The charge transfer resistance decreased markedly from 202.9 Ω to 3.36 Ω. Under industrially relevant conditions (30% KOH, 80 ℃), the electrode demonstrated outstanding durability with negligible performance decay after 100 h of continuous operation at 1000 mA/cm², surpassing most reported non-precious metal catalysts. This work offers a cost-effective and scalable approach for fabricating industrially viable OER electrodes

Key words: oxygen evolution reaction, 316L stainless steel, flame spray pyrolysis, electrolysis water

CLC Number:

TK 02

Zhiqun BAI, Weihao SHA, Jinyuan MIAO, Ao XIE, Junru LIN, Pingyu WAN, Yang TANG. Flame-enabled in situ engineering of stainless-steel electrodes for high-efficiency electrocatalytic oxygen evolution[J]. Energy Storage Science and Technology, 2025, 14(10): 4020-4026.

Figures/Tables 4

References 25

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