Interface Engineering of Nickel Hexacyanoferrate Anchored on Covalent Triazine Framework-Coated Carbon Nanotubes for Oxygen Evolution

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Abstract
Developing electrocatalysts of remarkable potency, rapid charge transfer, and lasting durability is crucial for improving electrocatalytic performance toward the oxygen evolution reaction (OER). Here, a nickel hexacyanoferrate-anchored covalent triazine framework-coated carbon nanotube composite catalyst (NiHCF@CTF/CNT) was fabricated through a one-step hydrothermal strategy. In this core−shell hierarchical architecture, the CNT serves as a conductive inner core, CTF provides a nitrogen-rich confined interface and anchoring sites, and NiHCF is loaded on the outer surface as a Ni/Fe bimetallic active precursor. Benefiting from optimized interfacial coupling and more accessible active sites, NiHCF@CTF/CNT exhibits excellent OER performance in 1 M KOH, requiring only 275 mV to deliver 10 mA cm−2, with a low Tafel slope of 42.97 mV dec−1, while maintaining stable operation for 300 h. Combined experimental and theoretical analyses reveal favorable electronic structure reconstruction of the surface Ni/Fe sites, which optimizes intermediate adsorption and lowers the reaction energy barrier. This study provides a viable strategy for developing high-durability composite OER electrocatalysts.
Funding Information
  • Northwest Normal University Graduate Research Grant Program (KYZZ2025-LXS142)
  • the Key Research and Development Project of Gansu Province (20YF3GA022)
  • Natural Science Foundation of China (22365027)
  • The College Industry Support Plan Project of Gansu Province (2023CYZC-12)

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