Polydopamine-Coated Fe,Cr Co-Doped NiS₂ with M-N Coordination for Durable Oxygen Evolution.

Authors

Guirong Duan, Jie Jiang, Yanqing Jiao, Jiaqi Wang, Xi Zhao, Ganceng Yang, Haijing Yan, Honggang Fu

Published in

Inorganic chemistry. Jul 01, 2026. Epub Jul 01, 2026.

Abstract

Developing low-cost, corrosion-resistant catalytic electrodes for the oxygen evolution reaction (OER) is essential for efficient and durable hydrogen production via anion exchange membrane water electrolysis (AEMWE). Herein, we report a polydopamine (PDA)-coated Fe,Cr codoped NiS₂ self-supporting electrode (PDA-Fe,Cr-NiS₂@NF). The nitrogen-rich functional groups of PDA establish robust M-N coordination bonds with active metal centers, thereby suppressing metal dissolution during anodic reconstruction. In parallel, the conductive PDA layer regulates interfacial electron redistribution and optimizes the hydrogen-bond network of interfacial water, lowering the OER activation energy. Its conformal protective layer further enhances catalyst stability. The optimized electrode delivers an OER overpotential of only 247 mV at 1 A cm^-2. When integrated as the anode with a PtNiC cathode in an AEMWE cell, the system reaches a current density of 1 A cm^-2 at only 1.737 V at 70 °C and operates stably for 1000 h, with a voltage decay rate of only 0.1 mV h^-1, an electrolysis efficiency of 71.96%, and an energy consumption of 4.157 kWh Nm^3- H₂. This work establishes a viable coordination-protection strategy for constructing durable, high-performance OER electrodes for industrial-scale water electrolysis.

PMID:
42385226
Bibliographic data and abstract were imported from PubMed on 02 Jul 2026.

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